小编Jic*_*ery的帖子

我曾经习惯于UIView animateWithDuration增加shapeLayer.frame.size.height下面的代码,但无论持续时间如何,都会非常快.我发现的一些帖子推荐使用了我已经完成的一些延迟时间,但它仍然很快动画,忽略了我设置的5秒持续时间.

private let minimalHeight: CGFloat = 50.0  
private let shapeLayer = CAShapeLayer()

override func loadView() {  
super.loadView()

shapeLayer.frame = CGRect(x: 0.0, y: 0.0, width: view.bounds.width, height: minimalHeight)
shapeLayer.backgroundColor = UIColor(red: 57/255.0, green: 67/255.0, blue: 89/255.0, alpha: 1.0).CGColor
view.layer.addSublayer(shapeLayer)

  }

func delay(delay:Double, closure:()->()) {
    dispatch_after(
        dispatch_time(
            DISPATCH_TIME_NOW,
            Int64(delay * Double(NSEC_PER_SEC))
        ),
        dispatch_get_main_queue(), closure)
}


override func viewDidAppear(animated: Bool) {
   delay(3)    {

    UIView.animateWithDuration(5.0) {
        self.shapeLayer.frame.size.height += 400.0
        }
    }

如何在5秒内完成动画制作？

我一直在使用UIPanGestureRecognizer来识别触摸,但我想用动画的固定开始到结束位置替换它.请参阅以下代码:

panGestureDidMove:

func panGestureDidMove(gesture: UIPanGestureRecognizer) {  
if gesture.state == .Ended || gesture.state == .Failed || gesture.state == .Cancelled {

} else {
    let additionalHeight = max(gesture.translationInView(view).y, 0)

    let waveHeight = min(additionalHeight * 0.6, maxWaveHeight)
    let baseHeight = minimalHeight + additionalHeight - waveHeight

    let locationX = gesture.locationInView(gesture.view).x

    layoutControlPoints(baseHeight: baseHeight, waveHeight: waveHeight, locationX: locationX)
    updateShapeLayer()
    }
}

layoutControlPoints:

private func layoutControlPoints(baseHeight baseHeight: CGFloat, waveHeight: CGFloat, locationX: CGFloat) {  
let width = view.bounds.width

let minLeftX = min((locationX - width / 2.0) * 0.28, …