嗨，我想用 3 UIView 制作动画.主要问题是我无法通过从 layer 中删除动画来停止动画。 .
这是代码:
class HTAnimatedTypingView: UIView {
@IBOutlet weak var view1: UIView!
@IBOutlet weak var view2: UIView!
@IBOutlet weak var view3: UIView!
func startAnimation(){
UIView.animate(withDuration: 0.5, delay: 0, options: .repeat, animations: {
self.view1.frame.origin.y = 0
}, completion: nil)
UIView.animate(withDuration: 0.3, delay: 0.5, options: .repeat, animations: {
self.view2.frame.origin.y = 0
}, completion: nil)
UIView.animate(withDuration: 0.2, delay: 1.0, options: .repeat, animations: {
self.view3.frame.origin.y = 0
}, completion: nil)
}
func stopAnimations(){
self.view1.layer.removeAllAnimations()
self.view2.layer.removeAllAnimations()
self.view3.layer.removeAllAnimations()
}
}
以上代码输出:
预期动画:
如何使其与开始动画和停止动画功能一起使用？提前致谢...
最佳答案
由于您需要在每个动画序列之间添加一些暂停，我个人会使用 关键帧因为它为您提供了一些灵 active :
class AnimationViewController: UIViewController {
private let stackView: UIStackView = {
$0.distribution = .fill
$0.axis = .horizontal
$0.alignment = .center
$0.spacing = 10
return $0
}(UIStackView())
private let circleA = UIView()
private let circleB = UIView()
private let circleC = UIView()
private lazy var circles = [circleA, circleB, circleC]
func animate() {
let jumpDuration: Double = 0.30
let delayDuration: Double = 1.25
let totalDuration: Double = delayDuration + jumpDuration*2
let jumpRelativeDuration: Double = jumpDuration / totalDuration
let jumpRelativeTime: Double = delayDuration / totalDuration
let fallRelativeTime: Double = (delayDuration + jumpDuration) / totalDuration
for (index, circle) in circles.enumerated() {
let delay = jumpDuration*2 * TimeInterval(index) / TimeInterval(circles.count)
UIView.animateKeyframes(withDuration: totalDuration, delay: delay, options: [.repeat], animations: {
UIView.addKeyframe(withRelativeStartTime: jumpRelativeTime, relativeDuration: jumpRelativeDuration) {
circle.frame.origin.y -= 30
}
UIView.addKeyframe(withRelativeStartTime: fallRelativeTime, relativeDuration: jumpRelativeDuration) {
circle.frame.origin.y += 30
}
})
}
}
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .white
view.addSubview(stackView)
stackView.translatesAutoresizingMaskIntoConstraints = false
stackView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
stackView.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
circles.forEach {
$0.layer.cornerRadius = 20/2
$0.layer.masksToBounds = true
$0.backgroundColor = .systemBlue
stackView.addArrangedSubview($0)
$0.widthAnchor.constraint(equalToConstant: 20).isActive = true
$0.heightAnchor.constraint(equalTo: $0.widthAnchor).isActive = true
}
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
animate()
}
}
它应该很简单，但是如果您有任何问题，请随时告诉我!
结果如下所示:
关于ios - 如何在 iOS Swift 中制作加载动画？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/62208949/