替换视图时可可窗口的大小翻倍

Posted 2023-02-23

【中文标题】替换视图时可可窗口的大小翻倍

【英文标题】：Cocoa window doubles in size when replacing view

【发布时间】：2017-04-15 17:00:05

【问题描述】：

我试图在运行时用不同的视图替换一个视图（及其 ViewController）。现在，当我这样做时，旧视图会从窗口中消失，但新视图不会出现，并且窗口会变成原来宽度的两倍。 如果我切换到全屏，我可以在应用程序窗口的左下角看到非常小的新视图。

有人知道为什么会这样吗？我已经尝试了好几个小时，但我似乎找不到发生这种情况的原因。

为了替换视图（以及它的 ViewController），我使用以下代码：

func exchangeDiashowViewController(for newDiashowViewController: NSViewController) 
    if let oldDiashowViewControllerAsStateObserver = self.diashowViewController as? DiashowStateObserver 
        DiashowManager.sharedInstance.remove(stateObserver: oldDiashowViewControllerAsStateObserver)
    
    if let oldDiashowViewControllerAsSpeedObserver = self.diashowViewController as? DiashowSpeedObserver 
        DiashowManager.sharedInstance.remove(speedObserver: oldDiashowViewControllerAsSpeedObserver)
    

    if let newDiashowViewControllerAsStateObserver = newDiashowViewController as? DiashowStateObserver 
        DiashowManager.sharedInstance.add(stateObserver: newDiashowViewControllerAsStateObserver)
    
    if let newDiashowViewControllerAsSpeedObserver = newDiashowViewController as? DiashowSpeedObserver 
        DiashowManager.sharedInstance.add(speedObserver: newDiashowViewControllerAsSpeedObserver)
    

    self.view.replaceSubview(self.diashowViewController.view, with: newDiashowViewController.view)
    self.diashowViewController.removeFromParentViewController()
    self.addChildViewController(newDiashowViewController)

    self.diashowViewController = newDiashowViewController

    let centerHorizontallyConstraint = NSLayoutConstraint(item: self.diashowViewController.view, attribute: .centerX, relatedBy: .equal, toItem: self.view, attribute: .centerX, multiplier: 1.0, constant: 0.0)
    let centerVerticallyConstraint = NSLayoutConstraint(item: self.diashowViewController.view, attribute: .centerY, relatedBy: .equal, toItem: self.view, attribute: .centerY, multiplier: 1.0, constant: 0.0)
    let widthConstraint = NSLayoutConstraint(item: self.diashowViewController.view, attribute: .width, relatedBy: .equal, toItem: self.view, attribute: .width, multiplier: 1.0, constant: 0.0)
    let heightConstraint = NSLayoutConstraint(item: self.diashowViewController.view, attribute: .height, relatedBy: .equal, toItem: self.view, attribute: .height, multiplier: 1.0, constant: 0.0)

    self.view.addConstraints([centerHorizontallyConstraint, centerVerticallyConstraint, widthConstraint, heightConstraint])

我真的希望有人有一个想法。提前非常感谢！

【参考方案1】：

看来self.view.replaceSubview() 是问题所在。

我使用

让一切正常

self.diashowViewController.view.removeFromSuperview()
self.view.addSubview(newDiashowViewController.view)

改为。