移除animateWithDuration完成塊內的UIView：完成

Question

我使用animateWithDuration：completion完成UIView的某些屬性的動畫處理。這些動畫完成後，我想從他的超級視圖中刪除此視圖。 問題是，如果我添加完成塊內removeFromSuperView我沒有得到動畫。我發現的解決方法是刪除dispatch_after中的視圖。爲什麼？

 var loadingView: Loading! //This is a UIView loaded from a Nib 
    let delaySecs: NSTimeInterval = 2 
    UIView.animateWithDuration(delaySecs, animations: {() -> Void in 
     self.loadingView.cherrysImageView.transform = CGAffineTransformMakeScale(2, 2) 
     self.loadingView.cherrysImageView.alpha = 0 
    }) { (succeed) -> Void in 
     //Can't remove the view here, otherwise i get NO animation 
     //self.loadingView.removeFromSuperview() 
    } 

     //And if i add this instead of removing the view in the completion block, it works as expected 
    let delay = delaySecs * Double(NSEC_PER_SEC) 
    let time = dispatch_time(DISPATCH_TIME_NOW, Int64(delay)) 
    dispatch_after(time, dispatch_get_main_queue()) {() -> Void in 
     self.loadingView.removeFromSuperview() 
    } 

Answer 1

動畫完成塊在動畫過程中被多次調用，但只有當成功爲真時，才應刪除所有內容。

var loadingView: Loading! //This is a UIView loaded from a Nib 
let delaySecs: NSTimeInterval = 2 
UIView.animateWithDuration(delaySecs, animations: {() -> Void in 
    self.loadingView.cherrysImageView.transform = CGAffineTransformMakeScale(2, 2) 
    self.loadingView.cherrysImageView.alpha = 0 
}) { (succeed) -> Void in 
    if succeed { 
     self.loadingView.removeFromSuperview() 
    } 
}