[英]How to set up a delay in a CADisplayLink
我正在使用CADisplayLink
為10個不同的按鈕設置動畫,但這些按鈕都聚集在一起。 所以我的問題是如何實現延遲以使每個按鈕在不同的時間生成動畫,這樣它們就不會全部聚集在一起。
var buttons:[UIButton] = Array()
override func viewDidLoad() {
super.viewDidLoad()
var displayLink = CADisplayLink(target: self, selector: "handleDisplayLink:")
displayLink.addToRunLoop(NSRunLoop.currentRunLoop(), forMode: NSDefaultRunLoopMode)
for index in 0...10 - 1{
buttons.append(UIButton.buttonWithType(.System) as UIButton)
var xLocation:CGFloat = CGFloat(arc4random_uniform(300) + 30)
buttons[index].frame = CGRectMake(xLocation, 10, 100, 100)
buttons[index].setTitle("Test Button \(index)", forState: UIControlState.Normal)
buttons[index].addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)
self.view.addSubview(buttons[index])
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
func handleDisplayLink(displayLink: CADisplayLink) {
for index in 0...10 - 1{
var buttonFrame = buttons[index].frame
buttonFrame.origin.y += 1
buttons[index].frame = buttonFrame
if buttons[index].frame.origin.y >= 500 {
displayLink.invalidate()
}
}
}
func buttonAction(sender: UIButton) {
sender.alpha = 0
}
要使用延遲進行動畫,您只需使用UIView.animateWithDuration
函數而不是CADisplayLink
。 例如
override func viewDidLoad() {
for index in 0...10 - 1{
buttons.append(UIButton.buttonWithType(.System) as UIButton)
var xLocation:CGFloat = CGFloat(arc4random_uniform(300) + 30)
buttons[index].frame = CGRectMake(xLocation, 10, 100, 100)
buttons[index].setTitle("Test Button \(index)", forState: UIControlState.Normal)
buttons[index].addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)
self.view.addSubview(buttons[index])
// Change this line to change the delay between the button animations.
let delay : NSTimeInterval = 1.0 * NSTimeInterval(index)
UIView.animateWithDuration(2.0, delay: delay, options: UIViewAnimationOptions.CurveLinear, animations: { () -> Void in
var buttonFrame = self.buttons[index].frame
buttonFrame.origin.y = 500
self.buttons[index].frame = buttonFrame
}, completion: { (finished) -> Void in
})
}
}
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