//
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// LanternZoomAnimator.swift
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// Lantern
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//
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// Created by JiongXing on 2019/11/26.
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// Copyright © 2021 Shenzhen Hive Box Technology Co.,Ltd All rights reserved.
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//
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import UIKit
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/// Zoom动画
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open class LanternZoomAnimator: NSObject, LanternAnimatedTransitioning {
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open var showDuration: TimeInterval = 0.25
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open var dismissDuration: TimeInterval = 0.25
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open var isNavigationAnimation = false
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public typealias PreviousViewAtIndexClosure = (_ index: Int) -> UIView?
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/// 转场动画的前向视图
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open var previousViewProvider: PreviousViewAtIndexClosure = { _ in nil }
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/// 替补的动画方案
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open lazy var substituteAnimator: LanternAnimatedTransitioning = LanternFadeAnimator()
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public init(previousView: @escaping PreviousViewAtIndexClosure) {
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previousViewProvider = previousView
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}
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public func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
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return isForShow ? showDuration : dismissDuration
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}
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public func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
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if isForShow {
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playShowAnimation(context: transitionContext)
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} else {
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playDismissAnimation(context: transitionContext)
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}
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}
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private func playShowAnimation(context: UIViewControllerContextTransitioning) {
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guard let browser = lantern else {
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context.completeTransition(!context.transitionWasCancelled)
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return
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}
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if isNavigationAnimation,
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let fromView = context.view(forKey: .from),
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let fromViewSnapshot = snapshot(with: fromView),
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let toView = context.view(forKey: .to) {
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toView.insertSubview(fromViewSnapshot, at: 0)
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}
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context.containerView.addSubview(browser.view)
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guard let (snap1, snap2, thumbnailFrame, destinationFrame) = snapshotsAndFrames(browser: browser) else {
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// 转为执行替补动画
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substituteAnimator.isForShow = isForShow
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substituteAnimator.lantern = lantern
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substituteAnimator.isNavigationAnimation = isNavigationAnimation
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substituteAnimator.animateTransition(using: context)
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return
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}
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snap1.frame = thumbnailFrame
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snap2.frame = thumbnailFrame
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snap2.alpha = 0
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browser.maskView.alpha = 0
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browser.browserView.isHidden = true
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context.containerView.addSubview(snap1)
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context.containerView.addSubview(snap2)
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UIView.animate(withDuration: showDuration, animations: {
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browser.maskView.alpha = 1.0
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snap1.frame = destinationFrame
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snap1.alpha = 0
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snap2.frame = destinationFrame
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snap2.alpha = 1.0
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}) { _ in
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browser.browserView.isHidden = false
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browser.view.insertSubview(browser.maskView, belowSubview: browser.browserView)
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snap1.removeFromSuperview()
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snap2.removeFromSuperview()
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context.completeTransition(!context.transitionWasCancelled)
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}
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}
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private func playDismissAnimation(context: UIViewControllerContextTransitioning) {
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guard let browser = lantern else {
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return
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}
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guard let (snap1, snap2, thumbnailFrame, destinationFrame) = snapshotsAndFrames(browser: browser) else {
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// 转为执行替补动画
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substituteAnimator.isForShow = isForShow
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substituteAnimator.lantern = lantern
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substituteAnimator.isNavigationAnimation = isNavigationAnimation
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substituteAnimator.animateTransition(using: context)
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return
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}
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snap1.frame = destinationFrame
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snap1.alpha = 0
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snap2.frame = destinationFrame
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context.containerView.addSubview(snap1)
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context.containerView.addSubview(snap2)
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browser.browserView.isHidden = true
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UIView.animate(withDuration: showDuration, animations: {
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browser.maskView.alpha = 0
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snap1.frame = thumbnailFrame
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snap1.alpha = 0
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snap2.frame = thumbnailFrame
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snap2.alpha = 1.0
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}) { _ in
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if let toView = context.view(forKey: .to) {
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context.containerView.addSubview(toView)
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}
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snap1.removeFromSuperview()
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snap2.removeFromSuperview()
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context.completeTransition(!context.transitionWasCancelled)
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}
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}
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private func snapshotsAndFrames(browser: Lantern) -> (UIView, UIView, CGRect, CGRect)? {
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let browserView = browser.browserView
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let view = browser.view
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let closure = previousViewProvider
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guard let previousView = closure(browserView.pageIndex) else {
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return nil
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}
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guard let cell = browserView.visibleCells[browserView.pageIndex] as? LanternZoomSupportedCell else {
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return nil
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}
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let thumbnailFrame = previousView.convert(previousView.bounds, to: view)
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let showContentView = cell.showContentView
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// 两Rect求交集，得出显示中的区域
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let destinationFrame = cell.convert(cell.bounds.intersection(showContentView.frame), to: view)
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guard let snap1 = fastSnapshot(with: previousView) else {
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LanternLog.high("取不到前截图！")
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return nil
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}
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guard let snap2 = snapshot(with: cell.showContentView) else {
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LanternLog.high("取不到后截图！")
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return nil
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}
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return (snap1, snap2, thumbnailFrame, destinationFrame)
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}
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}
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