UIView animateWithDuration太快了

Question

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？

Answer 1

也许你应该尝试CABasicAnimation

    let fromValue = view2.layer.bounds.height
    let toValue = view2.layer.bounds.height + 50
    CATransaction.setDisableActions(true) //Not necessary
    view2.layer.bounds.size.height = toValue
    let positionAnimation = CABasicAnimation(keyPath:"bounds.size.height")
    positionAnimation.fromValue = fromValue
    positionAnimation.toValue = toValue
    positionAnimation.duration = 1
    view2.layer.addAnimation(positionAnimation, forKey: "bounds")