我试图让四个UIButton在Swift中旋转。我明白了:
import UIKit
extension UIView {
func rotate360Degrees(duration: CFTimeInterval = 1.0, completionDelegate: AnyObject? = nil) {
let rotateAnimation = CABasicAnimation(keyPath: "transform.rotation")
rotateAnimation.fromValue = 0.0
rotateAnimation.toValue = CGFloat(M_PI * 2.0)
rotateAnimation.duration = duration
if let delegate: AnyObject = completionDelegate {
rotateAnimation.delegate = delegate
}
self.layer.addAnimation(rotateAnimation, forKey: nil)
}
}
但我需要重复一遍。在我的UIViewController中,我使用了animationDidStop函数但是如何知道这四个动画中的哪一个触发了它呢?它有一个名为CAAnimation的参数,但我无法将它与任何东西进行比较。有什么建议吗?
答案 0 :(得分:0)
使用CATransition重写您的方法并使用此问题的解决方案: How to identify CAAnimation within the animationDidStop delegate?