Ios Swift 5 CAKeyframeAnimation-在应用程序移动到地面后恢复层动画
我可以查看显示小指示条(用于声音) 下面是代码:Ios Swift 5 CAKeyframeAnimation-在应用程序移动到地面后恢复层动画,ios,swift,cakeyframeanimation,Ios,Swift,Cakeyframeanimation,我可以查看显示小指示条(用于声音) 下面是代码: class IndicatorView: UIViewController { enum AudioState { case stop case play case pause } var state: AudioState! { didSet { switch state { case .pause: pauseAnimation()
class IndicatorView: UIViewController {
enum AudioState {
case stop
case play
case pause
}
var state: AudioState! {
didSet {
switch state {
case .pause:
pauseAnimation()
case .play:
playAnimation()
default:
stopAnimation()
}
}
}
var numberOfBars: Int = 5
var barWidth: CGFloat = 4
var barSpacer: CGFloat = 4
var barColor: UIColor = .systemPink
private var bars: [UIView] = [UIView]()
private func stopAnimation() {
bars.forEach { $0.alpha = 0 }
}
private func pauseAnimation() {
bars.forEach {
$0.layer.speed = 0
$0.transform = CGAffineTransform(scaleX: 1, y: 0.1)
}
}
private func playAnimation() {
bars.forEach {
$0.alpha = 1
$0.layer.speed = 1
}
}
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .clear
DispatchQueue.main.async {
self.setupViews()
}
}
private func setupViews() {
for i in 0...numberOfBars - 1 {
let b = UIView()
b.backgroundColor = barColor
addAnimation(to: b)
view.addSubview(b)
bars.append(b)
b.anchor(top: view.topAnchor, leading: view.leadingAnchor, bottom: view.bottomAnchor, trailing: nil,
padding: .init(top: 0, left: CGFloat(i) * (barWidth + barSpacer), bottom: 0, right: 0),
size: .init(width: barWidth, height: 0))
}
stopAnimation()
}
private func addAnimation(to v: UIView) {
let animation = CAKeyframeAnimation()
animation.keyPath = "transform.scale.y"
animation.values = [0.1, 0.3, 0.2, 0.5, 0.8, 0.3, 0.99, 0.72, 0.3].shuffled()
animation.duration = 1
animation.autoreverses = true
animation.repeatCount = .infinity
v.layer.add(animation, forKey: "baran")
}
}
工作很好。我是从另一个vc那里用的,等等
问题
当应用程序移到后台时,音乐播放器暂停,并处于<代码>指示灯视图<代码>状态=。暂停<代码>已分配,但当应用程序返回时,用户点击播放,例如在<代码>指示灯视图<代码>状态=。播放<代码>
playamation()
被调用,条层的速度为1。。。但根本没有动画片
谢谢当应用程序转到后台时,CALayer动画将暂停。您可以实现在转到bg/fg时暂停和恢复动画的方法,但对于您的情况,如果将对“addAnimation(to:b)”的调用从SetupView移动到“playAnimation()”方法,则可以保证动画始终存在。例:
bars.forEach {
$0.alpha = 1
addAnimation(to: $0)
$0.layer.speed = 1
}
希望有帮助:)是的,您指向正确的方向adri,只需首先检查层是否有动画,然后调用
addAnimation
方法