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我有4个按钮,都使用同样的动画FUNC为什么UIView和UIImageView有不同的动画效果?
- imageViewWithoutDelay
- imageViewWithDelay
- ViewWithoutDelay
- ViewWithDelay
我的代码:
import UIKit
class ViewController: UIViewController {
@IBAction func imageViewithoutDelay(_ sender: AnyObject) {
let circleImage = UIImageView()
// kindly add your own image.
circleImage.image = UIImage(named: "empty")
animate(inputView: circleImage, delay: false)
}
@IBAction func imageViewWithDelay(_ sender: UIButton) {
let circleImage = UIImageView()
circleImage.image = UIImage(named: "empty")
animate(inputView: circleImage, delay: true)
}
func animate(inputView : UIView, delay: Bool){
inputView.layer.cornerRadius = inputView.frame.size.width/2
inputView.clipsToBounds = true
inputView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(inputView)
let screenSize = UIScreen.main.bounds
let screenHeight = screenSize.height * 0.10
inputView.center.y = screenHeight
view.setNeedsLayout()
view.setNeedsDisplay()
if delay == true{
DispatchQueue.main.asyncAfter(deadline: .now() + .seconds(1), execute: {
UIView.animate(withDuration: 2.5, animations: {
inputView.alpha = 0.0
let screenSize = UIScreen.main.bounds
let screenHeight = screenSize.height * 0.10
inputView.center.y -= screenHeight
})
})} else{
UIView.animate(withDuration: 2.5, animations: {
inputView.alpha = 0.0
let screenSize = UIScreen.main.bounds
let screenHeight = screenSize.height * 0.10
inputView.center.y -= screenHeight
})
}
}
override func viewDidLoad() {
super.viewDidLoad()
}
}
让我感到有趣的是UIview
& UIImageView
的不同行为。
的UIImageView
实例仅动画按预期(从起点上升)如果我使用的延迟。但是,如果不使用延迟块,则UIImageView实例首先下降,然后动画将上升至原点)。
的UIView
不显示不同的行为。它从起源开始动起来,并上升。
这个问题是一个切线this原来的问题。