//
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// TransitionUtil.swift
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// WanPai
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//
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// Created by 无故事王国 on 2023/11/23.
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//
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import Foundation
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///通用转场工具类
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class TransitionUtil: NSObject {
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///转场类型
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var transitionType: TransitionType?
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//交互转场
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var interactive = false
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let interactionTransition = UIPercentDrivenInteractiveTransition()
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override init() {
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super.init()
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}
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//MARK: ------------ 不同类型的转场 ------------
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private func transitionAnimation(transitionContext: UIViewControllerContextTransitioning) {
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//获得容器视图（转场动画发生的地方）
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let containerView = transitionContext.containerView
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//动画执行时间
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let duration = self.transitionDuration(using: transitionContext)
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//fromVC (即将消失的视图)
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let fromVC = transitionContext.viewController(forKey: .from)!
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let fromView = fromVC.view!
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//toVC (即将出现的视图)
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let toVC = transitionContext.viewController(forKey: .to)!
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let toView = toVC.view!
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var offset = containerView.frame.width
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var fromTransform = CGAffineTransform.identity
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var toTransform = CGAffineTransform.identity
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switch transitionType {
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case .modal(let operation):
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offset = containerView.frame.height
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let fromY = operation == .presentation ? 0 : offset
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fromTransform = CGAffineTransform(translationX: 0, y: fromY)
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let toY = operation == .presentation ? offset : 0
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toTransform = CGAffineTransform(translationX: 0, y: toY)
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if operation == .presentation {
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containerView.addSubview(toView)
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}
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case .navigation(let operation):
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offset = operation == .push ? offset : -offset
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fromTransform = CGAffineTransform(translationX: -offset, y: 0)
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toTransform = CGAffineTransform(translationX: offset, y: 0)
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containerView.insertSubview(toView, at: 0)
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//containerView.addSubview(toView)
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case .tabBar(let direction):
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offset = direction == .left ? offset : -offset
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fromTransform = CGAffineTransform(translationX: offset, y: 0)
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toTransform = CGAffineTransform(translationX: -offset, y: 0)
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containerView.addSubview(toView)
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case nil:
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break
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}
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toView.transform = toTransform
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UIView.animate(withDuration: duration, animations: {
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fromView.transform = fromTransform
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toView.transform = .identity
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}) { (finished) in
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fromView.transform = .identity
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toView.transform = .identity
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//考虑到转场中途可能取消的情况，转场结束后，恢复视图状态。(通知是否完成转场)
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let wasCancelled = transitionContext.transitionWasCancelled
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transitionContext.completeTransition(!wasCancelled)
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}
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}
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}
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///转场类型
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enum TransitionType {
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//导航栏
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case navigation(_ operation: UINavigationController.Operation)
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//tabBar切换
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case tabBar(_ direction: TabBarOperationDirection)
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//模态跳转
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case modal(_ operation: ModalOperation)
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}
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enum TabBarOperationDirection {
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case left
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case right
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}
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enum ModalOperation {
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case presentation
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case dismissal
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}
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///自定义模态转场动画时使用
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extension TransitionUtil: UIViewControllerTransitioningDelegate {
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func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
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self.transitionType = .modal(.presentation)
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return self
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}
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func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
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self.transitionType = .modal(.dismissal)
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return self
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}
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//interactive false:非交互转场， true: 交互转场
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func interactionControllerForPresentation(using animator: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning? {
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return interactive ? self.interactionTransition : nil
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}
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//interactive false:非交互转场， true: 交互转场
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func interactionControllerForDismissal(using animator: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning? {
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return interactive ? self.interactionTransition : nil
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}
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}
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/// 自定义navigation转场动画时使用
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extension TransitionUtil: UINavigationControllerDelegate {
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func navigationController(_ navigationController: UINavigationController, animationControllerFor operation: UINavigationController.Operation, from fromVC: UIViewController, to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
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self.transitionType = .navigation(operation)
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return self
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}
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func navigationController(_ navigationController: UINavigationController, interactionControllerFor animationController: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning? {
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return interactive ? self.interactionTransition : nil
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}
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}
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/// 自定义tab转场动画时使用
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extension TransitionUtil: UITabBarControllerDelegate {
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func tabBarController(_ tabBarController: UITabBarController, animationControllerForTransitionFrom fromVC: UIViewController, to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
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let fromIndex = tabBarController.viewControllers?.firstIndex(of: fromVC) ?? 0
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let toIndex = tabBarController.viewControllers?.firstIndex(of: toVC) ?? 0
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let direction: TabBarOperationDirection = fromIndex < toIndex ? .right : .left
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self.transitionType = .tabBar(direction)
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return self
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}
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func tabBarController(_ tabBarController: UITabBarController, interactionControllerFor animationController: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning? {
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return interactive ? self.interactionTransition : nil
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}
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}
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extension TransitionUtil: UIViewControllerAnimatedTransitioning {
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//控制转场动画执行时间
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func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
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return 0.5
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}
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//执行动画的地方，最核心的方法。
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func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
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transitionAnimation(transitionContext: transitionContext)
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}
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}
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