如何在UIWindow中添加视图？

本文介绍了如何在UIWindow中添加视图？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我想在 UIWindow 中添加一个视图，其代码如下：

I wanted to add a view in UIWindow with following code:

 AppDelegate *delegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
 UIWindow *window = delegate.window;
 UIView *aView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 100, 100)];
 aView.backgroundColor = [UIColor blackColor];
 [window addSubview:aView];

此代码不起作用。我想克隆UIAlertView的属性。当我们调用
[alertViewInstance show]; 方法时，它会弹出一切。

This code didn't work. I wanted to clone property of UIAlertView. It will pop over top of everything when we call[alertViewInstance show]; method.

试过这个：

   UIView *aView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 100, 100)];
    UIWindow* window = [UIApplication sharedApplication].keyWindow;

    if (!window) {
        window = [[UIApplication sharedApplication].windows objectAtIndex:0];
    }

    [window addSubview:aView];
    [window bringSubviewToFront:aView];

推荐答案

试用此代码：

window = [[UIApplication sharedApplication].windows lastObject];

替换以下代码：

window = [[UIApplication sharedApplication].windows objectAtIndex:0];

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