//
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// VTContentView.m
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// VTMagicView
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//
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// Created by tianzhuo on 14/12/29.
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// Copyright (c) 2014年 tianzhuo. All rights reserved.
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//
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#import "VTContentView.h"
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#import "UIViewController+VTMagic.h"
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#import "UIScrollView+VTMagic.h"
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@interface VTContentView()
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@property (nonatomic, strong) NSMutableDictionary *visibleDict; // 屏幕上可见的控制器
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@property (nonatomic, strong) NSMutableArray *indexList; // 索引集合
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@property (nonatomic, strong) NSMutableArray *frameList; // 控制器的坐标集合
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@property (nonatomic, strong) NSString *identifier; // 重用标识符
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@property (nonatomic, strong) NSCache *pageCache; // 缓存池
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@end
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@implementation VTContentView
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#pragma mark - Lifecycle
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- (instancetype)initWithFrame:(CGRect)frame {
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self = [super initWithFrame:frame];
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if (self) {
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_needPreloading = YES;
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_indexList = [[NSMutableArray alloc] init];
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_frameList = [[NSMutableArray alloc] init];
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_visibleDict = [[NSMutableDictionary alloc] init];
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_pageCache = [[NSCache alloc] init];
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_pageCache.name = @"com.tianzhuo.magic";
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_pageCache.countLimit = 10;
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#if TARGET_OS_IPHONE
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(clearMemoryCache)
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name:UIApplicationDidReceiveMemoryWarningNotification
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object:nil];
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#endif
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}
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return self;
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}
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- (void)dealloc {
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[[NSNotificationCenter defaultCenter] removeObserver:self];
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}
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- (void)layoutSubviews {
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[super layoutSubviews];
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if (CGRectIsEmpty(self.frame)) {
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return;
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}
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CGFloat offset = self.contentOffset.x;
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CGFloat width = self.frame.size.width;
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BOOL isNotBorder = 0 != (int)offset%(int)width;
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NSInteger currentPage = offset/self.frame.size.width;
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if (_currentPage == currentPage && isNotBorder) {
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return;
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}
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_currentPage = currentPage;
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CGRect frame = CGRectZero;
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UIViewController *viewController = nil;
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NSArray *pathList = [_visibleDict allKeys];
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for (NSIndexPath *indexPath in pathList) {
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frame = [_frameList[indexPath.row] CGRectValue];
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viewController = _visibleDict[indexPath];
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// 控制器若移出屏幕则将其视图从父类中移除，并添加到缓存池中
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if (![self vtm_isNeedDisplayWithFrame:frame preloading:_needPreloading]) {
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[self moveViewControllerToCache:viewController];
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[_visibleDict removeObjectForKey:indexPath];
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} else {
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viewController.view.frame = frame;
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}
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}
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NSMutableArray *tempPaths = [_indexList mutableCopy];
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[tempPaths removeObjectsInArray:pathList];
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for (NSIndexPath *indexPath in tempPaths) {
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frame = [_frameList[indexPath.row] CGRectValue];
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if ([self vtm_isNeedDisplayWithFrame:frame preloading:_needPreloading]) {
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[self loadViewControllerAtIndexPath:indexPath];
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}
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}
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}
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#pragma mark - functional methods
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- (void)reloadData {
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[self resetCacheData];
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[self resetPageFrames];
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[self setNeedsLayout];
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[self layoutIfNeeded];
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}
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-(void)resetCacheData {
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[_indexList removeAllObjects];
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for (NSInteger i = 0; i < _pageCount; i++) {
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NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
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[_indexList addObject:indexPath];
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}
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// reload时清除所有页面
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NSArray *viewControllers = [_visibleDict allValues];
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for (UIViewController *viewController in viewControllers) {
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[self moveViewControllerToCache:viewController];
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}
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[_visibleDict removeAllObjects];
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}
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- (void)moveViewControllerToCache:(UIViewController *)viewController {
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[viewController willMoveToParentViewController:nil];
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[viewController.view removeFromSuperview];
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[viewController removeFromParentViewController];
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// 添加到缓存池
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NSMutableSet *cacheSet = [_pageCache objectForKey:viewController.reuseIdentifier];
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if (!cacheSet) cacheSet = [[NSMutableSet alloc] init];
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[cacheSet addObject:viewController];
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[_pageCache setObject:cacheSet forKey:viewController.reuseIdentifier];
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}
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- (void)resetPageFrames {
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[_frameList removeAllObjects];
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CGRect frame = self.bounds;
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for (NSIndexPath *indexPath in _indexList) {
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frame.origin.x = indexPath.row * frame.size.width;
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[_frameList addObject:[NSValue valueWithCGRect:frame]];
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}
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self.contentSize = CGSizeMake(CGRectGetMaxX(frame), 0);
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self.contentOffset = CGPointMake(CGRectGetWidth(frame)*_currentPage, 0);
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}
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#pragma mark - 根据页面控制器获取对应的索引
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- (NSInteger)pageIndexForViewController:(UIViewController *)viewController {
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for (NSIndexPath *indexPath in _visibleDict.allKeys) {
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if ([viewController isEqual:_visibleDict[indexPath]]) {
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return indexPath.row;
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}
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}
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return NSNotFound;
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}
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- (CGRect)frameOfViewControllerAtPage:(NSUInteger)pageIndex
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{
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if (_frameList.count <= pageIndex) {
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return CGRectZero;
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}
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return [_frameList[pageIndex] CGRectValue];
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}
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#pragma mark - 根据索引获取页面控制器
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- (UIViewController *)viewControllerAtPage:(NSUInteger)pageIndex {
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return [self viewControllerAtPage:pageIndex autoCreate:NO];
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}
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- (UIViewController *)creatViewControllerAtPage:(NSUInteger)pageIndex {
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return [self viewControllerAtPage:pageIndex autoCreate:YES];
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}
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- (UIViewController *)viewControllerAtPage:(NSUInteger)pageIndex autoCreate:(BOOL)autoCreate {
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if (_pageCount <= pageIndex) {
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return nil;
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}
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NSIndexPath *indexPath = [NSIndexPath indexPathForRow:pageIndex inSection:0];
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UIViewController *viewController = [_visibleDict objectForKey:indexPath];
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if (!viewController && autoCreate) {
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viewController = [self loadViewControllerAtIndexPath:indexPath];
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}
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return viewController;
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}
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- (UIViewController *)loadViewControllerAtIndexPath:(NSIndexPath *)indexPath {
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UIViewController *viewController = [_dataSource contentView:self viewControllerAtPage:indexPath.row];
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if (viewController) {
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viewController.reuseIdentifier = _identifier;
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CGRect pageFrame = [_frameList[indexPath.row] CGRectValue];
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viewController.view.frame = pageFrame;
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[self addSubview:viewController.view];
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[_visibleDict setObject:viewController forKey:indexPath];
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}
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_identifier = nil;
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return viewController;
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}
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#pragma mark - 根据缓存标识查询可重用的视图控制器
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- (UIViewController *)dequeueReusablePageWithIdentifier:(NSString *)identifier {
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_identifier = identifier;
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NSMutableSet *cacheSet = [_pageCache objectForKey:identifier];
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UIViewController *viewController = [cacheSet anyObject];
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if (viewController) {
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[cacheSet removeObject:viewController];
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[_pageCache setObject:cacheSet forKey:identifier];
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}
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return viewController;
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}
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#pragma mark - clear memory cache
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- (void)clearMemoryCache {
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[_pageCache removeAllObjects];
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}
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#pragma mark - accessor methods
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- (NSArray *)visibleList {
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return [_visibleDict allValues];
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}
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@end
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