CATransaction动画完成后，您可以使用来调用完成块。
func shakeView(iv: UIImageView){
CATransaction.begin()
CATransaction.setCompletionBlock({
iv.hidden = true
})
var shake:CABasicAnimation = CABasicAnimation(keyPath: "position")
shake.duration = 0.1
shake.repeatCount = 21
shake.autoreverses = true
var from_point:CGPoint = CGPointMake(iv.center.x - 5, iv.center.y)
var from_value:NSValue = NSValue(CGPoint: from_point)
var to_point:CGPoint = CGPointMake(iv.center.x + 5, iv.center.y)
var to_value:NSValue = NSValue(CGPoint: to_point)
shake.fromValue = from_value
shake.toValue = to_value
iv.layer.addAnimation(shake, forKey: "position")
CATransaction.commit()
}
或者，您也可以将两个动画组合在一起，CATransaction如下所示。
func shakeView(iv: UIImageView){
var shake:CABasicAnimation = CABasicAnimation(keyPath: "position")
shake.duration = 0.1
shake.repeatCount = 21
shake.autoreverses = true
var from_point:CGPoint = CGPointMake(iv.center.x - 5, iv.center.y)
var from_value:NSValue = NSValue(CGPoint: from_point)
var to_point:CGPoint = CGPointMake(iv.center.x + 5, iv.center.y)
var to_value:NSValue = NSValue(CGPoint: to_point)
shake.fromValue = from_value
shake.toValue = to_value
iv.layer.addAnimation(shake, forKey: "position")
}
override func viewDidLoad() {
CATransaction.begin()
CATransaction.setCompletionBlock({
self.image1.hidden = true
self.image2.hidden = true
})
shakeView(image1)
shakeView(image)
CATransaction.commit()
}
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