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[英]Adding a view in a completion block of UIView.animateWithDuration
[英]UIView.animateWithDuration doesn't animate on separate view controller
將動畫設置為反復淡入和淡出。 “ viewSmall”和“ viewBig”是UIImageViews。
class TestViewController: UIViewController {
@IBOutlet weak var viewBig: UIImageView!
@IBOutlet weak var viewSmall: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
animate()
}
func animate() {
UIView.animateWithDuration(0.5,
delay: 0,
options: [.Repeat, .Autoreverse],
animations: {
self.viewSmall.alpha = 0
},
completion: nil)
UIView.animateWithDuration(0.5,
delay: 0,
options: [.Repeat, .Autoreverse],
animations: {
self.viewBig.alpha = 0
},
completion: nil)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
這段代碼不會在僅有的幾個視圖控制器上進行動畫處理,而且我認為這些視圖控制器似乎是獨立的,與其他視圖控制器無關。 因為此代碼在連接到導航視圖控制器的視圖控制器上可以完美工作。
如何在獨立的視圖控制器上制作它? 請幫忙。
找到了一個絕妙的解決方案。 使用dispatch_after捕獲持續時間和延遲。
func animate(){
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, Int64(0.0 * Double(NSEC_PER_SEC))), dispatch_get_main_queue(), {
// Animate the transition
UIView.animateWithDuration(0.5,
delay: 0,
options: [.Repeat, .Autoreverse],
animations: {
self.viewSmall.alpha = 0
},
completion: nil)
UIView.animateWithDuration(0.5,
delay: 0,
options: [.Repeat, .Autoreverse],
animations: {
self.viewBig.alpha = 0
},
completion: nil)
})
}
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