У меня есть простое приложение, которое представляет собой red позицию преобразования вида из левого экрана в правый экран. Я хочу, чтобы когда я нажимаю кнопку remove, анимация перезапускалась (положение red вида преобразуется из левого экрана в правый экран снова), но это не работает. red вид возвращается к исходному кадру, но он не движется, но animationDidStop все еще вызывается после продолжительности.
class TestViewController: UIViewController, CAAnimationDelegate {
let testView : UIView = {
let view = UIView()
view.translatesAutoresizingMaskIntoConstraints = false
view.backgroundColor = .red
view.layer.borderColor = UIColor.black.cgColor
view.layer.cornerRadius = 5
return view
}()
let removeAniButton : UIButton = {
let btn = UIButton(type: .system)
btn.translatesAutoresizingMaskIntoConstraints = false
btn.setTitle("Remove", for: .normal)
return btn
}()
let addAniButton : UIButton = {
let btn = UIButton(type: .system)
btn.translatesAutoresizingMaskIntoConstraints = false
btn.setTitle("Add", for: .normal)
return btn
}()
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .white
view.addSubview(testView)
testView.leftAnchor.constraint(equalTo: self.view.leftAnchor).isActive = true
testView.centerYAnchor.constraint(equalTo: self.view.centerYAnchor).isActive = true
testView.heightAnchor.constraint(equalToConstant: 100).isActive = true
testView.widthAnchor.constraint(equalToConstant: 100).isActive = true
view.addSubview(removeAniButton)
removeAniButton.topAnchor.constraint(equalTo: self.view.topAnchor, constant: 50).isActive = true
removeAniButton.centerXAnchor.constraint(equalTo: self.view.centerXAnchor).isActive = true
removeAniButton.widthAnchor.constraint(equalToConstant: 100).isActive = true
removeAniButton.heightAnchor.constraint(equalToConstant: 50).isActive = true
removeAniButton.addTarget(self, action: #selector(removeAnimation), for: .touchUpInside)
view.addSubview(addAniButton)
addAniButton.topAnchor.constraint(equalTo: self.view.topAnchor, constant: 150).isActive = true
addAniButton.centerXAnchor.constraint(equalTo: self.view.centerXAnchor).isActive = true
addAniButton.widthAnchor.constraint(equalToConstant: 100).isActive = true
addAniButton.heightAnchor.constraint(equalToConstant: 50).isActive = true
addAniButton.addTarget(self, action: #selector(addAnimation), for: .touchUpInside)
addAnimation()
// Do any additional setup after loading the view.
}
func createAnimation() -> CAAnimation {
let animation = CABasicAnimation(keyPath: "position.x")
animation.fromValue = 0
animation.toValue = self.view.frame.width
animation.duration = 4
animation.timingFunction = CAMediaTimingFunction.init(name: kCAMediaTimingFunctionLinear)
animation.fillMode = kCAFillModeForwards
animation.isRemovedOnCompletion = false
animation.delegate = self
return animation
}
func removeAnimation(){
testView.layer.removeAllAnimations()
testView.transform = .identity
addAnimation()
}
func addAnimation(){
testView.layer.add(createAnimation(), forKey: nil)
}
func animationDidStop(_ anim: CAAnimation, finished flag: Bool) {
if flag {
print("Animation is finished")
}
}
}
кто-нибудь может объяснить?
