Swift - 将新的 UIWINdow 定位在屏幕中心

Posted 2023-02-23

【中文标题】Swift - 将新的 UIWINdow 定位在屏幕中心

【英文标题】：Swift -Position new UIWIndow in center of Screen

【发布时间】：2020-05-22 09:59:04

【问题描述】：

用户点击一个单元格，我得到了 touchLocation，创建了一个新的 UIWindow，然后将其动画到屏幕的中心。问题是当新窗口（紫色）出现在屏幕上而不是其中心位于屏幕中心时，它的 x,y 坐标从屏幕中心开始。

我明白了：

但我想要这个：

// the collectionView is dimmed black, that's why the background color is dark
guard let keyWindow = UIApplication.shared.keyWindow else  return 

let startingRect = CGRect(x: userTouchPointX, y: userTouchPointY, width: 10, height: 10)

let newWindow = UIWindow(frame: startingRect)
newWindow.backgroundColor = .clear
newWindow.windowLevel = UIWindow.Level.normal
newWindow.rootViewController = UINavigationController(rootViewController: PurpleVC())
newWindow.isHidden = false
newWindow.makeKey()

let endingCenterX = keyWindow.screen.bounds.midX // I also tried keyWindow.frame.width / 2 and also UIScreen.main.bounds.width / 2
let endingCenterY = keyWindow.screen.bounds.midY // I also tried keyWindow.frame.height / 2 and also UIScreen.main.bounds.height / 2
let endingWidth = keyWindow.frame.width
let endingHeight: CGFloat = 200

let endingCenter = CGPoint(x: endingCenterX, y: endingCenterY)

UIView.animate(withDuration: 0.4, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 1, options: [.curveEaseIn], animations: 

    newWindow.center = endingCenter
    newWindow.frame.size.width = endingWidth
    newWindow.frame.size.height = endingHeight
)  (_) in

    newWindow.layoutIfNeeded()

【参考方案1】：

更改您的中心设置窗口的框架后将解决您的问题......希望它会有所帮助

// newWindow.center = endingCenter remove from here
    newWindow.frame.size.width = endingWidth
    newWindow.frame.size.height = endingHeight
    newWindow.center = endingCenter // add it here

【讨论】：

它不是完成处理程序先生

在 UIView.animate 中你只需要更新layoutIfNeeded()

什么是关键窗口中心？

完成时不要调用 layoutifneeded

设置框架后呼叫中心会解决问题