[英]UIView animateWithDuration is too fast
我已經使用UIView
animateWithDuration
來增加下面代碼中的shapeLayer.frame.size.height
,但無論持續時間如何,它都會非常快。 我發現的一些帖子推薦使用了我已經完成的一些延遲時間,但它仍然很快動畫,忽略了我設置的5秒持續時間。
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秒內完成動畫制作?
試試吧 :
override func viewDidAppear(_ animated: Bool) {
//You should not edit directly the frame here, or the change will be committed ASAP. Frame does not act like constraints.
// create the new frame
var newFrame = self.shapeLayer.frame
newFrame.size.height += 400.0
UIView.animate(withDuration: 5.0, delay: 3.0, options: .curveEaseOut, animations: {
//assign the new frame in the animation block
self.shapeLayer.frame = newFrame
}, completion: { finished in
})
}
也許你應該嘗試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")
而不是將更改放在動畫塊內,在動畫之前進行更改。
然后,在動畫中,只調用superView.layoutIfNeeded()
它對我有用 ,參考: 如何設置約束變化的動畫?
在我的情況下,問題是代碼動畫中的其他地方被禁用:
[UIView setAnimationsEnabled:false];
將此更改為true可解決此問題:
[UIView setAnimationsEnabled:true];
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