//
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// FFHomePageViewController.m
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// FFPage
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//
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// Created by North on 2019/8/9.
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// Copyright © 2019 North. All rights reserved.
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//
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#import "FFAdapterViewController.h"
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@interface FFAdapterViewController ()<UIGestureRecognizerDelegate>
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/**
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当前分页中显示的控制器
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*/
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@property (weak, nonatomic) UIViewController<FFPageProtocol> * controller;
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/**
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是否更新位置
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*/
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@property (assign, nonatomic) BOOL isUpdateFrame;
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/**
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物理动画容器
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*/
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@property(nonatomic, strong) UIDynamicAnimator *dynamicAnimator;
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/**
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惯性行为
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*/
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@property(nonatomic, weak) UIDynamicItemBehavior *inertialBehavior;//惯性
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/**
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减速行为
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*/
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@property(nonatomic, weak) UIDynamicItemBehavior *decelerateBehavior;
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/**
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回弹行为
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*/
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@property(nonatomic, weak) UIAttachmentBehavior *bounceBehavior;
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/**
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最大拖动系数
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*/
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@property(assign,nonatomic) CGFloat maxBounceDistance;
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/**
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最小速度 小于这个蜀都就打开手势交互
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*/
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@property(assign,nonatomic) CGFloat minVelocity;
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/**
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是否手指触摸
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*/
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@property(assign,nonatomic) BOOL isTouch;
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/**
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正在滚动
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*/
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@property(assign,nonatomic) BOOL isScroll;
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@end
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@implementation FFAdapterViewController
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- (void)viewDidLoad {
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[super viewDidLoad];
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[self setUpView];
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[self setUpNotice];
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}
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- (void)setUpView{
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self.minVelocity = 120;
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[self.view addSubview:self.scrollview];
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[self addSubViewControllers];
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UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(panGestureAction:)];
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panGesture.delegate = self;
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[self.view addGestureRecognizer:panGesture];
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}
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- (void)addSubViewControllers{
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[self.scrollview.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
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[self.childViewControllers makeObjectsPerformSelector:@selector(removeFromParentViewController)];
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NSAssert(self.headViewController != nil, @"请设置headViewController");
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[self addSubController:self.headViewController];
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NSAssert(self.menuViewController != nil, @"请设置menuViewController");
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[self addSubController:self.menuViewController];
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NSAssert(self.pageViewController != nil, @"请设置pageViewController");
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[self addSubController:self.pageViewController];
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}
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- (void)addSubController:(UIViewController *)controller{
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[self addChildViewController:controller];
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[self.scrollview addSubview:controller.view];
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[controller didMoveToParentViewController:self];
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}
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- (void)setUpNotice{
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[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(beginRefresh:) name:FFPageBeginRefreshNotice object:nil];
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[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(endRefresh:) name:FFPageEndRefreshNotice object:nil];
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}
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- (void)beginRefresh:(NSNotification *)notice{
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FFRereshView * refreshView = notice.object;
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if (refreshView.scrollView == self.scrollview || self.controller.scrollview == refreshView.scrollView) {
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[self.dynamicAnimator removeAllBehaviors];
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self.inertialBehavior = nil;
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self.bounceBehavior = nil;
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self.decelerateBehavior = nil;
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return;
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}
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}
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- (void)endRefresh:(NSNotification *)notice{
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FFRereshView * refreshView = notice.object;
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if (refreshView.scrollView == self.scrollview || self.controller.scrollview == refreshView.scrollView) {
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[self.dynamicAnimator removeAllBehaviors];
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self.inertialBehavior = nil;
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self.bounceBehavior = nil;
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self.decelerateBehavior = nil;
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return;
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}
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}
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- (void)updateCurrentController:(UIViewController<FFPageProtocol> * _Nonnull)controller{
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self.controller = controller;
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[self.controller scrollview].scrollEnabled = NO;
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}
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- (void)reloadData{
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[self addSubViewControllers];
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}
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- (void)updateHeightWithAnimation:(BOOL)animation completion:(void (^)(void))completion{
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self.isUpdateFrame = YES;
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[UIView animateWithDuration:animation ? .3 :CGFLOAT_MIN animations:^{
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[self.view setNeedsLayout];
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[self.view layoutIfNeeded];
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} completion:^(BOOL finished) {
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if (finished && completion)completion();
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}];
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}
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- (void)panGestureAction:(UIPanGestureRecognizer *)sender{
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if (sender.state == UIGestureRecognizerStateBegan) {
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self.isTouch = YES;
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self.isScroll = YES;
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[self.dynamicAnimator removeAllBehaviors];
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}
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else if (sender.state == UIGestureRecognizerStateChanged) {
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CGFloat transY = [sender translationInView:self.view].y;//滚动方向y>0为向下
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[self transitionWithOffset:transY];
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[sender setTranslation:CGPointZero inView:self.view];
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}
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else if (sender.state == UIGestureRecognizerStateEnded ) {
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self.isTouch = NO;
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CGPoint velocity = [sender velocityInView:self.view];
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if (fabs(velocity.y) < self.minVelocity) {
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self.isScroll = NO;
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// 外部滚动视图的偏移量
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CGFloat outOffY = self.scrollview.contentOffset.y;
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// 子视图的偏移量
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CGFloat subOffY = [self.controller scrollview].contentOffset.y;
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// 子视图最大
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CGFloat maxSubOffY = self.scrollview.maxOffsetY;
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// 子视图内容是否填满 影响向上滚动的回弹
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BOOL isSubFill = [self.controller scrollview].contentSize.height > [self.controller scrollview].bounds.size.height;
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if (subOffY > maxSubOffY) {
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[self bounceForScrollView:[self.controller scrollview] isTop:NO];
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} else if (subOffY < -[self.controller scrollview].contentInset.top) {
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[self bounceForScrollView:[self.controller scrollview] isTop:YES];
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} else if (outOffY < -self.scrollview.contentInset.top) {
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[self bounceForScrollView:self.scrollview isTop:YES];
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} else if (!isSubFill) {
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[self bounceForScrollView:[self.controller scrollview] isTop:subOffY < 0];
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}
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return;
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}
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//惯性
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FFDynamicItem *item = [[FFDynamicItem alloc] init];
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item.center = CGPointZero;
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__block CGFloat lastCenterY = 0;
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UIDynamicItemBehavior *inertialBehavior = [[UIDynamicItemBehavior alloc] initWithItems:@[item]];
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[inertialBehavior addLinearVelocity:CGPointMake(0, -velocity.y) forItem:item];
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inertialBehavior.resistance = 2;
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__weak typeof(self) weakSelf = self;
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inertialBehavior.action = ^{
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[weakSelf transitionWithOffset:lastCenterY - item.center.y];
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lastCenterY = item.center.y;
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CGPoint inertialVelocity = [weakSelf.inertialBehavior linearVelocityForItem:item];
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if (fabs(inertialVelocity.y) < self.minVelocity) weakSelf.isScroll = NO;
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};
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self.inertialBehavior = inertialBehavior;
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[self.dynamicAnimator addBehavior:inertialBehavior];
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}
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}
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#pragma mark - 内外部滚动视图的偏移量处理
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- (void)transitionWithOffset:(CGFloat)offset{
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CGFloat outOffY = self.scrollview.contentOffset.y;//外部滚动视图的偏移量
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CGFloat subOffY = [self.controller scrollview].contentOffset.y; //子视图的偏移量
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CGFloat maxOffY = self.headHeight - self.ignoreTopSpeace + self.scrollview.contentInset.top;//headView悬浮的时候最大偏移量
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CGFloat maxSubOffY = [self.controller scrollview].maxOffsetY;
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//手指向上
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if (offset < 0) {
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// *********优先判断子视图是否滚动到顶部
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//子视图未滚动到顶部
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if (subOffY > 0) {
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CGFloat final = subOffY - offset; //滚动多处的部分
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//多余的部分大于0 说明子视图还是没有到达顶部
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if (final > 0) {
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if (final <= maxSubOffY) {
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subOffY = final;
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[self setSubScrollViewOffY:subOffY];
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} else {
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#pragma mark 上拉到到最大的时候开始bounce
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//超过的部分做增量减少
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if (self.isTouch || self.decelerateBehavior) {
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CGFloat bounceDelta = MAX(0, (self.maxBounceDistance - fabs(subOffY - maxSubOffY))/self.maxBounceDistance) * 0.5;
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subOffY -= offset * bounceDelta;
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[self setSubScrollViewOffY:subOffY];
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} else {
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[self decelerateForScrollView:[self.controller scrollview] isTop:NO];
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}
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}
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} else {
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//多余的部分小于等于0 说明子视图刚好滚动到顶部或者超过顶部
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subOffY = 0;
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[self setSubScrollViewOffY:subOffY];
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[self transitionWithOffset:-final];
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}
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} else {
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if (subOffY ==0) {
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//********子视图已经滚动到顶部 滚动外部的
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//滚动到顶部
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if (outOffY < maxOffY) {
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CGFloat final = outOffY - offset - maxOffY;
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if (final < 0) {
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outOffY -= offset;
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[self setOutScrollViewOffY:outOffY];
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} else {
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outOffY = maxOffY;
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[self setOutScrollViewOffY:outOffY];
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[self transitionWithOffset:-final];
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}
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} else {
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subOffY -= offset;
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[self setSubScrollViewOffY:subOffY];
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}
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} else {
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CGFloat final = subOffY - offset;
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if (final<0) {
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subOffY = final;
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[self setSubScrollViewOffY:subOffY];
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} else {
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subOffY = 0;
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[self setSubScrollViewOffY:subOffY];
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[self transitionWithOffset:-final];
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}
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}
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}
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}
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//手指向下
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if (offset > 0) {
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if (subOffY > 0) {
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CGFloat final = subOffY - offset;
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if (final>0) {
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subOffY = final;
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[self setSubScrollViewOffY:subOffY];
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} else {
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subOffY = 0;
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[self setSubScrollViewOffY:subOffY];
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[self transitionWithOffset:-final];
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}
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} else {
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if (self.style == FFPageStyleSubRefresh) {
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if (outOffY >0) {
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CGFloat final = outOffY - offset;
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if (final>0 && final < maxOffY) {
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outOffY -= offset;
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[self setOutScrollViewOffY:outOffY];
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} else {
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if (final > maxOffY) {
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outOffY = maxOffY;
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[self setOutScrollViewOffY:outOffY];
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[self transitionWithOffset:final - maxOffY];
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} else if (final <0) {
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outOffY = 0;
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[self setOutScrollViewOffY:outOffY];
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[self transitionWithOffset:-final];
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} else {
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subOffY -= offset;
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[self setSubScrollViewOffY:subOffY];
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}
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}
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} else {
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#pragma mark 内部下拉到到最大的时候开始bounce
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if (self.isTouch || self.decelerateBehavior) {
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CGFloat bounceDelta = MAX(0, (self.maxBounceDistance - fabs(subOffY))/self.maxBounceDistance) * 0.5;
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subOffY -= offset * bounceDelta;
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[self setSubScrollViewOffY:subOffY];
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} else {
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[self decelerateForScrollView:[self.controller scrollview] isTop:YES];
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}
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}
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} else {
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if (outOffY >= -[self.controller scrollview].contentInset.top) {
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outOffY -= offset;
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[self setOutScrollViewOffY:outOffY];
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} else {
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#pragma mark 外部下拉到到最大的时候开始bounce
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if (self.isTouch || self.decelerateBehavior) {
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CGFloat bounceDelta = MAX(0, (self.maxBounceDistance - fabs(outOffY))/self.maxBounceDistance) * 0.5;
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outOffY -= offset * bounceDelta;
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[self setOutScrollViewOffY:outOffY];
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} else {
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[self decelerateForScrollView:self.scrollview isTop:YES];
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}
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}
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}
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}
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}
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}
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#pragma mark - 减速
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- (void)decelerateForScrollView:(UIScrollView *)scrollView isTop:(BOOL)isTop{
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if (self.decelerateBehavior)return;
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CGPoint inertialVelocity = [self.inertialBehavior linearVelocityForItem:[self.inertialBehavior.items lastObject]];//惯性结束时的速度
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[self.dynamicAnimator removeBehavior:self.inertialBehavior];
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self.inertialBehavior = nil;
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FFDynamicItem *item = [[FFDynamicItem alloc] init];
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item.center = CGPointZero;
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__block CGFloat lastCenterY = 0;
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UIDynamicItemBehavior *decelerateBehavior = [[UIDynamicItemBehavior alloc] initWithItems:@[item]];
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[decelerateBehavior addLinearVelocity:CGPointMake(0, inertialVelocity.y) forItem:item];
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decelerateBehavior.resistance = 20;
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__weak typeof(self) weakSelf = self;
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decelerateBehavior.action = ^{
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CGPoint decelerateVelocity = [weakSelf.decelerateBehavior linearVelocityForItem:item];
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if (fabs(decelerateVelocity.y) < self.minVelocity) {
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[weakSelf.dynamicAnimator removeBehavior:weakSelf.decelerateBehavior];
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weakSelf.decelerateBehavior = nil;
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[weakSelf bounceForScrollView:scrollView isTop:isTop];
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}else{
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[weakSelf transitionWithOffset:lastCenterY - item.center.y];
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lastCenterY = item.center.y;
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}
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};
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self.decelerateBehavior = decelerateBehavior;
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[self.dynamicAnimator addBehavior:decelerateBehavior];
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}
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#pragma mark - 回弹
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- (void)bounceForScrollView:(UIScrollView *)scrollView isTop:(BOOL)isTop{
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//下拉减速结束的时候 最终位置没有到达零界点 不执行回弹
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if (isTop && !scrollView.isReachTop) return;
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//上拉减速结束的时候 最终位置没有到达零界点 不执行回弹
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if (!isTop && !scrollView.isReachBottom) return;
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if (self.bounceBehavior) return;
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FFDynamicItem *item = [[FFDynamicItem alloc] init];
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item.center = scrollView.contentOffset;
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CGFloat targetOffY = isTop? -scrollView.contentInset.top:scrollView.maxOffsetY ;
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UIAttachmentBehavior *bounceBehavior = [[UIAttachmentBehavior alloc] initWithItem:item attachedToAnchor:CGPointMake(0, targetOffY)];
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bounceBehavior.length = 0;
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bounceBehavior.damping = 1;
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bounceBehavior.frequency = 2;
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__weak typeof(bounceBehavior) weakBounceBehavior = bounceBehavior;
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__weak typeof(self) weakSelf = self;
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bounceBehavior.action = ^{
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scrollView.contentOffset = CGPointMake(0, item.center.y);
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if (fabs(scrollView.contentOffset.y - targetOffY) < CGFLOAT_MIN) {
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[weakSelf.dynamicAnimator removeBehavior:weakBounceBehavior];
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weakSelf.bounceBehavior = nil;
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weakSelf.isScroll = NO;
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}
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if (weakSelf.scrollview == scrollView) {
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if (weakSelf.style == FFPageStyleHeadEnlarge) {
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CGRect frame = CGRectMake(0, 0, CGRectGetWidth(weakSelf.headViewController.view.bounds), weakSelf.headHeight);
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if (scrollView.contentOffset.y < 0) {
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frame = CGRectMake(0, roundf(scrollView.contentOffset.y), CGRectGetWidth(frame), weakSelf.headHeight - roundf(scrollView.contentOffset.y));
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}
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if (!CGRectEqualToRect(weakSelf.headViewController.view.frame, frame))weakSelf.headViewController.view.frame = frame;
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}
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return ;
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}
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if ([weakSelf.controller scrollview] == scrollView) {
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if ([self.controller respondsToSelector:@selector(conentOffsetDidChanged:)]) {
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[self.controller conentOffsetDidChanged:[self.controller scrollview].contentOffset];
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}
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return;
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}
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};
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self.bounceBehavior = bounceBehavior;
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[self.dynamicAnimator addBehavior:bounceBehavior];
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}
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- (void)setOutScrollViewOffY:(CGFloat)offY{
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self.scrollview.contentOffset = CGPointMake(self.scrollview.contentOffset.x, offY);
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[[NSNotificationCenter defaultCenter] postNotificationName:FFAdapterContentOffsetChangedNotice object:self.scrollview userInfo:@{@"contentOffset":NSStringFromCGPoint(self.scrollview.contentOffset)}];
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if (self.style == FFPageStyleHeadEnlarge) {
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CGRect frame = CGRectMake(0, 0, CGRectGetWidth(self.headViewController.view.bounds), self.headHeight);
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if (offY < 0) {
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frame = CGRectMake(0, roundf(offY), CGRectGetWidth(frame), self.headHeight - roundf(offY));
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}
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self.headViewController.view.frame = frame;
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}
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}
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- (void)setSubScrollViewOffY:(CGFloat)offY{
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[self.controller scrollview].contentOffset = CGPointMake([self.controller scrollview].contentOffset.x, offY);
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if ([self.controller respondsToSelector:@selector(conentOffsetDidChanged:)]) {
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[self.controller conentOffsetDidChanged:[self.controller scrollview].contentOffset];
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}
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}
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- (void)viewDidLayoutSubviews{
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[super viewDidLayoutSubviews];
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if (!CGRectEqualToRect(self.scrollview.frame, self.view.bounds) || self.isUpdateFrame) {
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#warning 有可能本页面有tabbar 下一个页面没有引起页面错位
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CGFloat tabbarHeight = isFullScreen() ? 49 + 34 : 49;
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if (fabs(CGRectGetHeight(self.scrollview.frame) - CGRectGetHeight(self.view.frame)) == tabbarHeight) return;
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self.scrollview.frame = self.view.bounds;
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self.headViewController.view.frame = CGRectMake(0, 0, CGRectGetWidth(self.scrollview.frame), self.headHeight);
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self.menuViewController.view.frame = CGRectMake(0, self.headHeight, CGRectGetWidth(self.scrollview.frame), self.menuHeight);
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self.pageViewController.view.frame = CGRectMake(0, self.headHeight + self.menuHeight, CGRectGetWidth(self.scrollview.frame), CGRectGetHeight(self.scrollview.frame) - self.menuHeight - self.ignoreTopSpeace);
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self.scrollview.contentSize = CGSizeMake(CGRectGetWidth(self.scrollview.frame), CGRectGetHeight(self.pageViewController.view.frame) + self.menuHeight +self.headHeight);
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self.maxBounceDistance = CGRectGetHeight(self.view.bounds) * .66;
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}
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}
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#pragma mark - getter
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@synthesize scrollview = _scrollview;
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-(UIScrollView *)scrollview{
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if (!_scrollview) {
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_scrollview = [[UIScrollView alloc]init];
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_scrollview.showsVerticalScrollIndicator = NO;
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_scrollview.showsHorizontalScrollIndicator =NO;
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_scrollview.backgroundColor = UIColor.clearColor;
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_scrollview.opaque = YES;
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_scrollview.scrollEnabled = NO;
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if (@available(iOS 11.0, *)) {
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_scrollview.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
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}
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}
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return _scrollview;
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}
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- (UIDynamicAnimator *)dynamicAnimator{
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if (!_dynamicAnimator) {
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_dynamicAnimator = [[UIDynamicAnimator alloc]initWithReferenceView:self.view];
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}
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return _dynamicAnimator;
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}
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@synthesize isScroll = _isScroll;
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- (void)setIsScroll:(BOOL)isScroll{
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_isScroll = isScroll;
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self.scrollview.userInteractionEnabled = !isScroll;
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}
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@synthesize isTouch = _isTouch;
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- (void)setIsTouch:(BOOL)isTouch{
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_isTouch = isTouch;
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self.scrollview.isTouch = isTouch;
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[self.controller scrollview].isTouch = isTouch;
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}
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#pragma mark - UIGestureRecognizerDelegate
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- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{
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// 正在执行开始动画和结束动画中不允许交互
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if (self.scrollview.isAnimationing || self.controller.scrollview.isAnimationing) return NO;
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CGPoint velocity = [(UIPanGestureRecognizer *)gestureRecognizer velocityInView:self.view];
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return fabs(velocity.y) > fabs(velocity.x);
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}
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- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
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[self.dynamicAnimator removeAllBehaviors];
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self.isScroll = NO;
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}
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- (void)dealloc{
|
|
[[NSNotificationCenter defaultCenter] removeObserver:self];
|
|
}
|
|
|
@end
|
