我的View Controller中有一个Image视图。我想在向视图控制器的下方识别平移手势时关闭视图控制器。虽然我已经用Pan手势取消了视图控制器,但我试图找出如何在解除之前添加动画,就像在iPhone中的照片应用程序中一样。
-(void)addPanGesture{
UIPanGestureRecognizer *gestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(dismissViewGes:)];
gestureRecognizer.delegate = self;
[self.view addGestureRecognizer:gestureRecognizer];
}
-(void)dismissViewGes:(UIPanGestureRecognizer *)gesture {
CGPoint velocity = [gesture velocityInView:self.view];
if(velocity.y > 0)
{
CATransition *transition = [[CATransition alloc]init];
transition.duration = 2;
[transition setValue:[NSNumber numberWithFloat:0.5f] forKey:kCATransitionFade];
transition.subtype = kCATransitionFromTop;
[self.view.layer addAnimation:transition forKey:nil];
[[NetWrapper shared] addRemovedController:self];
[self dismissViewControllerAnimated:NO completion:nil];
}
}
我尝试添加一个CATransition,希望淡出动画能够正常工作,但它不起作用,一旦应用了平移手势,视图就会消失。
如果像在照片应用程序中一样解除视图,我怎么能添加淡出效果。
答案 0 :(得分:3)
Swift 4.2,iOS 11
这是使用扩展名的一种优雅方式:
UIViewController
然后,您可以在函数中或private func dismissVC() {
let transition = CATransition().fadeTransition()
navigationController?.view.layer.add(transition, forKey: kCATransition)
navigationController?.popViewController(animated: false)
}
的操作按钮内编写以下三行代码:
DataClient dataClient = Wearable.getDataClient(this);
答案 1 :(得分:2)
试试这个:
@IBAction func clickDismiss(_ sender: Any) {
let transition: CATransition = CATransition()
transition.duration = 0.5
transition.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut)
transition.type = kCATransitionFade
transition.subtype = kCATransitionFromBottom
self.view.window!.layer.add(transition, forKey: nil)
self.dismiss(animated: false, completion: nil)
}
我提出了一个SubViewController并在其上添加了一个UIButton。将这些代码添加到按钮点击事件中,并为我工作。
答案 2 :(得分:0)
如果您需要在呈现或解除ViewController时添加动画,您应该使用UIViewControllerAnimatedTransitioning,这里有类似的答案: How do I do a Fade/No transition between view controllers
如果需要它是交互式的,可以使用UIPercentDrivenInteractiveTransition,它是一个控制百分比转换的类。
关于这一切,Apple提供了很好的示例代码: https://developer.apple.com/library/content/samplecode/CustomTransitions/Introduction/Intro.html 它有点旧,但很简单。