对于我的介绍页面，我有多个图像动画与音乐同步，以制作一个很酷的介绍页面。问题是当我点击菜单并返回应用程序时，所有动画都已完成。我已经实现了一个暂停音乐的功能，但需要对UIImage动画做同样的事情。仅供参考，这是真人快打主题曲，与歌曲中所说的角色同步。我以前没有使用过动画，所以在 SO 上查看其他解决方案并尝试它们不起作用。
// Mortal Kombat Good Guys
@IBOutlet weak var luiKangImage: UIImageView!
@IBOutlet weak var johnnyCageImage: UIImageView!
@IBOutlet weak var raidenImage: UIImageView!
@IBOutlet weak var kitanaImage: UIImageView!
@IBOutlet weak var sonyaImage: UIImageView!
@IBOutlet weak var nightWolfImage: UIImageView!
@IBOutlet weak var cassieCageImage: UIImageView!
@IBOutlet weak var kenshiTakahashiImage: UIImageView!
@IBOutlet weak var kungLaoImage: UIImageView!
@IBOutlet weak var jaxBriggsImage: UIImageView!
// Mortal Kombat Bad Guys
@IBOutlet weak var scorpionImage: UIImageView!
@IBOutlet weak var kanoImage: UIImageView!
@IBOutlet weak var reptileImage: UIImageView!
@IBOutlet weak var subZeroImage: UIImageView!
@IBOutlet weak var shangTsungImage: UIImageView!
@IBOutlet weak var goroImage: UIImageView!
@IBOutlet weak var shaoKhanImage: UIImageView!
@IBOutlet weak var tanyaImage: UIImageView!
@IBOutlet weak var quanChiImage: UIImageView!
@IBOutlet weak var mileenaImage: UIImageView!
var player: AVAudioPlayer?
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
//Set to execute function playSound
playSound()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
setInMotionImagePaths()
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
setInMotionImageTimePaths()
}
func setInMotionImagePaths() {
// Mortal Kombat Good Guys Image Animation Paths
luiKangImage.center.x -= view.bounds.width
johnnyCageImage.center.y += view.bounds.width
raidenImage.center.y -= view.bounds.width
kitanaImage.center.x -= view.bounds.width
sonyaImage.center.x -= view.bounds.width
nightWolfImage.center.y += view.bounds.width
cassieCageImage.center.y -= view.bounds.width
kenshiTakahashiImage.center.y += view.bounds.width
kungLaoImage.center.x -= view.bounds.width
jaxBriggsImage.center.y -= view.bounds.width
// Mortal Kombat Bad Guys Image Animation Paths
scorpionImage.center.x += view.bounds.width
kanoImage.center.y += view.bounds.width
reptileImage.center.x += view.bounds.width
subZeroImage.center.x += view.bounds.width
shangTsungImage.center.y += view.bounds.width
goroImage.center.x += view.bounds.width
shaoKhanImage.center.y += view.bounds.width
tanyaImage.center.x += view.bounds.width
quanChiImage.center.y += view.bounds.width
mileenaImage.center.x += view.bounds.width
}
func setInMotionImageTimePaths() {
playSound()
// Mortal Kombat Good Guys Animation Time and Path
UIView.animate(withDuration: 5.0, delay: 0.6, options: [], animations: {
self.luiKangImage.center.x += self.view.bounds.width
}, completion: nil)
//DONT TOUCH TIME
UIView.animate(withDuration: 5.0, delay: 2.3, options: [], animations: {
self.johnnyCageImage.center.y -= self.view.bounds.width
}, completion: nil)
//DONT TOUCH TIME
UIView.animate(withDuration: 5.0, delay: 1.2, options: [], animations: {
self.raidenImage.center.y += self.view.bounds.width
}, completion: nil)
//DONT TOUCH TIME
UIView.animate(withDuration: 5.0, delay: 10.0, options: [], animations: {
self.kitanaImage.center.x += self.view.bounds.width
}, completion: nil)
UIView.animate(withDuration: 5.0, delay: 8.5, options: [], animations: {
self.sonyaImage.center.x += self.view.bounds.width
}, completion: nil)
//DONT TOUCH TIME
UIView.animate(withDuration: 5.0, delay: 11.0, options: [], animations: {
self.nightWolfImage.center.y -= self.view.bounds.width
}, completion: nil)
UIView.animate(withDuration: 5.0, delay: 12.0, options: [], animations: {
self.cassieCageImage.center.y += self.view.bounds.width
}, completion: nil)
UIView.animate(withDuration: 5.0, delay: 13.0, options: [], animations: {
self.kenshiTakahashiImage.center.y -= self.view.bounds.width
}, completion: nil)
UIView.animate(withDuration: 5.0, delay: 14.0, options: [], animations: {
self.kungLaoImage.center.x += self.view.bounds.width
}, completion: nil)
UIView.animate(withDuration: 5.0, delay: 15.0, options: [], animations: {
self.jaxBriggsImage.center.y += self.view.bounds.width
}, completion: nil)
// Mortal Kombat Bad Guys Animation Time and Path
UIView.animate(withDuration: 4.0, delay: 5.5, options: [], animations: {
self.scorpionImage.center.x -= self.view.bounds.width
}, completion: nil)
//DONT TOUCH TIME
UIView.animate(withDuration: 2.0, delay: 0.0, options: [], animations: {
self.kanoImage.center.y -= self.view.bounds.width
}, completion: nil)
//DONT TOUCH TIME
UIView.animate(withDuration: 5.0, delay: 11.0, options: [], animations: {
self.reptileImage.center.x -= self.view.bounds.width
}, completion: nil)
UIView.animate(withDuration: 4.0, delay: 7.0, options: [], animations: {
self.subZeroImage.center.x -= self.view.bounds.width
}, completion: nil)
//DONT TOUCH TIME
UIView.animate(withDuration: 5.0, delay: 10.3, options: [], animations: {
self.shangTsungImage.center.y -= self.view.bounds.width
}, completion: nil)
UIView.animate(withDuration: 5.0, delay: 11.5, options: [], animations: {
self.goroImage.center.x -= self.view.bounds.width
}, completion: nil)
UIView.animate(withDuration: 5.0, delay: 12.5, options: [], animations: {
self.shaoKhanImage.center.y -= self.view.bounds.width
}, completion: nil)
UIView.animate(withDuration: 5.0, delay: 13.5, options: [], animations: {
self.tanyaImage.center.x -= self.view.bounds.width
}, completion: nil)
UIView.animate(withDuration: 5.0, delay: 15.0, options: [], animations: {
self.quanChiImage.center.y -= self.view.bounds.width
}, completion: nil)
UIView.animate(withDuration: 5.0, delay: 14.5, options: [], animations: {
self.mileenaImage.center.x -= self.view.bounds.width
}, completion: nil)
}
func playSound() {
let url = Bundle.main.url(forResource: "MortalKombatSong", withExtension: "mp3")!
do {
player = try AVAudioPlayer(contentsOf: url)
guard let player = player else { return }
player.prepareToPlay()
player.play()
player.numberOfLoops = 0
} catch let error {
print(error.localizedDescription)
}
}
func stopSound() {
if player?.isPlaying ?? true {
player?.stop()
}
}
如何在应用委托中暂停音乐
import AVFoundation
var player: AVAudioPlayer?
func applicationDidEnterBackground(_ application: UIApplication) {
// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
player?.pause()
}
你可以试试这个答案。我不相信可以暂停实际的视图动画，因为它们在传递到动画块后立即启动，并且您不会获得对它们的任何引用