preferredContentSize不会缩小

问题描述

我使用UIPopoverController弹出窗口.我使用preferredContentSize设置大小.然后，我使用Push更大尺寸的新视图控制器.当子视图弹出时，我想将窗口恢复到原始大小.但似乎行不通.

I use UIPopoverController to popover a window. I use preferredContentSize to set the size. Then, I use Push a new view controller with larger size. When the child view pop up, I like to recover the window to original size. But seems not work.

我已经把self.preferredContentSize = myWindowSize;但似乎无法恢复.

I already put the self.preferredContentSize = myWindowSize; But it seems can not recover.

在iOS6或更低版本中，我将contentSizeForViewInPopover设置为CGSizeZero，然后设置适当的大小.但是在iOS7上，它将使弹出窗口消失.

In iOS6 or before, I set the contentSizeForViewInPopover to CGSizeZero, then set the proper size. But on iOS7, it will make the popup disappear.

推荐答案

这为我解决了这个问题:

This solved it for me:

override func viewDidAppear(animated: Bool)
{
    navigationController?.preferredContentSize = preferredContentSize
    super.viewDidAppear(animated)
}

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