显示另一个UIWindow的麻烦 [英] trouble with displaying another UIWindow

问题描述

我正在写一个iPad应用程序，我正试图在我的应用程序主窗口的顶部显示第二个 UIWindow 。我要做的主要是创建一个登录窗口（如何使用UISplitViewController提交登录？） ，似乎在这里创建第二个窗口可能是一个不错的选择。

I'm writing an iPad app, and I'm trying to display a second UIWindow on top of the main window in my app. The main thing I'm trying to do is create a log in window (how to present a login, with UISplitViewController?), and it seems that creating a second window here might be a good option.

我做了一个非常简单的应用来试试这个。当用户点击按钮时，我正在尝试显示第二个窗口。这是代码：

I've made a very simple app to try this out. When the user hits a button, then I'm trying to show the second window. Here's the code:

- (IBAction)showOtherWindow:(id)sender {
    UIWindow* otherWindow = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];

    otherWindow.hidden = NO;
    otherWindow.clipsToBounds = YES;
    otherWindow.windowLevel = UIWindowLevelStatusBar;
    otherWindow.backgroundColor = [UIColor redColor];
    [otherWindow makeKeyAndVisible];
}

我期待在这里看到一个大红色的屏幕，但那不是'发生 - 没有任何改变。最后，我希望在顶部有一个较小的窗口。但是现在我只想看到一个窗口。

I'm expecting to see a big red screen here, but that doesn't happen - nothing changes. Ultimately, I'd like to have a smaller window floating on top. But right now I'd just like to see a window at all.

推荐答案

如果您使用的是ARC代码，那么您的窗口就是在 showOtherWindow：返回后立即取消分配。尝试将 otherWindow 分配给持久对象中的ivar。

If you're in ARC code your window is getting deallocated immediately after showOtherWindow: returns. Try assigning otherWindow to an ivar in a persistent object.

这篇关于显示另一个UIWindow的麻烦的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！