当我按下主页按钮然后重新启动应用程序时，我的动画停止运行。设置按钮停止旋转，闪烁标签消失。这是我的两个动画代码:
闪烁动画:
extension UILabel {
func startBlink() {
UIView.animate(withDuration: 0.8,
delay:0.0,
options:[.autoreverse, .repeat],
animations: {
self.alpha = 0
}, completion: nil)
}
}
旋转动画:
extension UIButton {
func startRotating() {
UIView.animate(withDuration: 4.0, delay: 0.0, options:[.autoreverse, .repeat,UIViewAnimationOptions.allowUserInteraction], animations: {
self.transform = CGAffineTransform(rotationAngle: CGFloat.pi)
}, completion: nil)
}
}
我在哪里运行它:
override func viewDidLoad() {
super.viewDidLoad()
settingsButton.layer.cornerRadius = 0.5 * settingsButton.bounds.size.width
settingsButton.clipsToBounds = true
settingsButton.imageView?.contentMode = .scaleAspectFit
NotificationCenter.default.addObserver(self, selector: #selector(appMovedToForeground), name: Notification.Name.UIApplicationWillEnterForeground, object: nil)
}
func appMovedToForeground() {
tapToPlayLabel.startBlink()
settingsButton.startRotating()
print("DID")
}
最佳答案
要重新启动动画，您必须执行以下操作，请检查以下代码。
检查扩展
import UIKit
class ViewController: UIViewController {
@IBOutlet weak var tapToPlayLabel: UILabel!
@IBOutlet weak var settingsButton: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
settingsButton.layer.cornerRadius = settingsButton.frame.size.width/2
settingsButton.clipsToBounds = true
//settingsButton.imageView?.contentMode = .scaleAspectFit
settingsButton.startRotating()
tapToPlayLabel.startBlink()
NotificationCenter.default.addObserver(self, selector: #selector(appMovedToForeground), name: Notification.Name.UIApplicationWillEnterForeground, object: nil)
}
func appMovedToForeground() {
self.tapToPlayLabel.startBlink()
self.settingsButton.startRotating()
}
}
extension UILabel {
func startBlink() {
self.alpha = 1
UIView.animate(withDuration: 0.8,
delay:0.0,
options:[.autoreverse, .repeat],
animations: {
self.alpha = 0
}, completion: nil)
}
}
extension UIButton {
func startRotating() {
self.transform = CGAffineTransform(rotationAngle: CGFloat.pi/2)
UIView.animate(withDuration: 4.0, delay: 0.0, options:[.autoreverse, .repeat,UIViewAnimationOptions.allowUserInteraction], animations: {
self.transform = CGAffineTransform(rotationAngle: CGFloat.pi)
}, completion: nil)
}
}
输出
关于ios - 按下主页按钮并再次重新启动应用程序时动画不起作用，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/45094328/