修复BUG

younger_times

2023-07-05 0d8f5fc8a516bfd07e425909e4a4432600572ee7

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//
//  DismissAnimation.swift
//  YuShiLive
//
//  Created by cxria on 16/10/25.
//  Copyright © 2016年 yushilive. All rights reserved.
//
 
import Foundation
import UIKit
class DismissAnimation: NSObject , UIViewControllerAnimatedTransitioning{
    func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
        return 0.1
    }
    func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
        // let containerView = transitionContext.containerView()!
        let fromView = transitionContext.view(forKey: UITransitionContextViewKey.from)!
        // let toView = transitionContext.viewForKey(UITransitionContextToViewKey)!
        //containerView.addSubview(toView)
        UIView.animate(withDuration: 0.1, animations: {
            fromView.alpha = 0.0
            }, completion: {
                flag in
                transitionContext.completeTransition(true)
        })
    }
}
 
class PresentAnimation: NSObject , UIViewControllerAnimatedTransitioning{
    
    func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
        return 0.1
    }
    func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
        let containerView = transitionContext.containerView
        let toView = transitionContext.view(forKey: UITransitionContextViewKey.to)!
        containerView.addSubview(toView)
        toView.alpha = 0.0
        UIView.animate(withDuration: 0.1, animations: {
            toView.alpha = 1.0
            }, completion: {
                flag in
                transitionContext.completeTransition(true)
        })
    }
    
}
 
class PushAnimation: NSObject , UIViewControllerAnimatedTransitioning{
    
    func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
        return 0.3
    }
    /// 设置动画的进行方式，附有详细注释，demo中其他地方的这个方法不再解释
    func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
        let fromViewController = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.from)
        let toViewController = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.to)
        let containerView = transitionContext.containerView
        
        // 需要关注一下from/to和presented/presenting的关系
        // For a Presentation:
        //      fromView = The presenting view.
        //      toView   = The presented view.
        // For a Dismissal:
        //      fromView = The presented view.
        //      toView   = The presenting view.
        
        var fromView = fromViewController?.view
        var toView = toViewController?.view
        
        // iOS8引入了viewForKey方法，尽可能使用这个方法而不是直接访问controller的view属性
        // 比如在form sheet样式中，我们为presentedViewController的view添加阴影或其他decoration，animator会对整个decoration view
        // 添加动画效果，而此时presentedViewController的view只是decoration view的一个子视图
        if transitionContext.responds(to: #selector(UIViewControllerTransitionCoordinatorContext.view(forKey:))) {
            fromView = transitionContext.view(forKey: UITransitionContextViewKey.from)
            toView = transitionContext.view(forKey: UITransitionContextViewKey.to)
        }
        
        // 我们让toview的origin.y在屏幕的一半处，这样它从屏幕的中间位置弹起而不是从屏幕底部弹起，弹起过程中逐渐变为不透明
        toView?.frame = CGRect(x: fromView!.frame.origin.x, y: fromView!.frame.maxY / 2, width: fromView!.frame.width, height: fromView!.frame.height)
        toView?.alpha = 0.0
        
        // 在present和，dismiss时，必须将toview添加到视图层次中
        containerView.addSubview(toView!)
        
        let transitionDuration = self.transitionDuration(using: transitionContext)
        // 使用spring动画，有弹簧效果，动画结束后一定要调用completeTransition方法
        UIView.animate(withDuration: transitionDuration, delay: 0, usingSpringWithDamping: 0.6, initialSpringVelocity: 0, options: .curveLinear, animations: { () -> Void in
            toView!.alpha = 1.0     // 逐渐变为不透明
            toView?.frame = transitionContext.finalFrame(for: toViewController!)    // 移动到指定位置
        }) { (finished: Bool) -> Void in
            let wasCancelled = transitionContext.transitionWasCancelled
            transitionContext.completeTransition(!wasCancelled)
        }
    }
}