iOS Swift控制器转场动画示例代码
前言
在IOS开发中,我们model另外一个控制器的时候,一般都使用默认的转场动画。本文将给大家详细介绍关于iOS Swift控制器转场动画的相关内容,分享出来供大家参考学习,下面话不多说了,来一起看看详细的介绍吧。
返回效果也可更改
四种转场动画
1. move:源图片位置移动到目标图片位置;
2. circle:根据源控件大小创建圆形或者椭圆形path路径,放大展示目标;
3. tier:源左右,目标由小到大缩放;
4. middle:源的中心点开始放大,返回是缩回到中心。
代码解析
给UIViewController添加一个属性yy_routerAnimation: YYTransition
extension UIViewController { public var yy_routerAnimation : YYTransition { set { objc_setAssociatedObject(self, &YYTransitionKey.kRouterAnimationKey, newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC) } get { guard let r = objc_getAssociatedObject(self, &YYTransitionKey.kRouterAnimationKey) as? YYTransition else { return YYTransition() } return r } } }
YYTransition类
public class YYTransition: NSObject
遵守代理
extension YYTransition: UIViewControllerAnimatedTransitioning, UIViewControllerTransitioningDelegate, UINavigationControllerDelegate
实现代理方法
return self } public func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval { return 转场动画所需时间 }
这个方法内调用相应动画方法
public func animateTransition(using transitionContext: UIViewControllerContextTransitioning) { switch self.yy_ransitionAnimationType { case .circle: break case .move: break case .middle: break case .tier: break } }
相关属性
extension YYTransition { // 是push还是pop public var yy_isBack: Bool {} // 动画类型 var yy_ransitionAnimationType: YYTransitionAnimationType {} // 源view名字 var yy_fromViewPath: String? { } // 目标view名字 var yy_toViewPath: String? { } // 句柄 var yy_transitionContext: UIViewControllerContextTransitioning {} }
实现基础动画结束时的代理方法
extension YYTransition: CAAnimationDelegate { public func animationDidStop(_ anim: CAAnimation, finished flag: Bool) { yy_transitionContext.completeTransition(!yy_transitionContext.transitionWasCancelled) yy_transitionContext.viewController(forKey: .from)?.view.layer.mask = nil yy_transitionContext.viewController(forKey: .to)?.view.layer.mask = nil } }
基础动画对路径操作的动画
extension YYTransition { func maskAnimation(targetVC: UIViewController, startPath: UIBezierPath, endPath: UIBezierPath, context: UIViewControllerContextTransitioning) { }
下面四个文件内实现相对应的动画
YYTransition+Circle YYTransition+Move YYTransition+Tier YYTransition+Middle
动画实现的思想基本就是拿到源view和目标view,控制位置和大小,做相应的动画即可。
用到的方法
UIViewControllerContextTransitioning 调用 public func viewController(forKey key: UITransitionContextViewControllerKey) -> UIViewController? UIViewController调用 open func value(forKeyPath keyPath: String) -> Any? * When requesting a snapshot, 'afterUpdates' defines whether the snapshot is representative of what's currently on screen or if you wish to include any recent changes before taking the snapshot. open func snapshotView(afterScreenUpdates afterUpdates: Bool) -> UIView? open func convert(_ rect: CGRect, from view: UIView?) -> CGRect open func insertSubview(_ view: UIView, belowSubview siblingSubview: UIView) // This must be called whenever a transition completes (or is cancelled.) // Typically this is called by the object conforming to the // UIViewControllerAnimatedTransitioning protocol that was vended by the transitioning // delegate. For purely interactive transitions it should be called by the // interaction controller. This method effectively updates internal view // controller state at the end of the transition. public func completeTransition(_ didComplete: Bool)
具体代码在YE项目地址中YYTransition动态库中
eg在YYSourceTransitionViewController和YYTargetTransitionViewController中可以看到。
总结
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