将UIView或UIWindow置于状态栏上方 [英] Putting a UIView or UIWindow above Statusbar

问题描述

我的目标是在iPhone应用程序顶部的状态栏上方绘制一个隐形按钮（尺寸为320 * 20像素）。

My goal is to draw an invisible button above the status bar on the top of my iPhone app (dimension 320*20 pixels).

无论我尝试什么，有些东西是错误的：

No matter what I try, something is buggy:

1. 例如，我尝试创建一个新视图。当我想将视图放在我的应用程序顶部时，它总是消失在状态栏后面而不是在它前面！

1. For example, I tried to create a new view. When I want to place the view on the top of my app, it always disappears behind the status bar instead of being in front of it!

我发现了另一个关于Stackoverflow的好主意：
将UIView添加到所有其他视图之上，包括StatusBar
即使不推荐第二个UIWindow，我也试图实现它。在我注意到问题的那一刻，它按照我想要的方式工作：键盘在需要时不再出现（例如在文本框中单击时）！

I found another great idea on Stackoverflow: Add UIView Above All Other Views, Including StatusBar Even if a second UIWindow isn't recommended, I tried to implement it. It worked as I wanted until the moment that I noticed a problem: the keyboard doesn't appear anymore when needed (for example when clicking in a textbox)!

我怎么可能解决这个问题？或者有更好的解决方法吗？这是我创建第二个窗口的代码：

How can I possibly fix this? Or is there a better approach to my problem? This is my code for creating the second window:

// Create window
statusWindow = [[UIWindow alloc] initWithFrame:CGRectMake(0,0,320,20)];
statusWindow.windowLevel = UIWindowLevelStatusBar;
[statusWindow makeKeyAndVisible];

// Create statusBarButton
statusBarButton = [UIButton buttonWithType:UIButtonTypeCustom];
CGRect buttonFrame2 = statusBarButton.frame;
buttonFrame2.size = CGSizeMake(320,20);
statusBarButton.frame = buttonFrame2;
[statusBarButton addTarget:self action:@selector(goTop) forControlEvents:UIControlEventTouchUpInside]; 

// Place button into the new window
[statusWindow addSubview:statusBarButton];

推荐答案

在 - [UIWindow makeKeyAndVisible]的文档中：

In the documentation for -[UIWindow makeKeyAndVisible]:

这是一种方便的方法，使接收器成为主窗口并将其显示在其他窗口的前面。您还可以使用UIView的继承隐藏属性隐藏和显示窗口。

This is a convenience method to make the receiver the main window and displays it in front of other windows. You can also hide and reveal a window using the inherited hidden property of UIView.

关键窗口是可以确定的输入事件;非关键窗口中的文本字段可能不起作用。你可以做两件事：

The "key window" is the one that gets certain input events; text fields in a non-key window might not work. There are two things you can do:

• 之后在旧键窗口调用[window makeKeyAndVisible]


• 设置 statusWindow.hidden = NO （但我不明白为什么默认情况下会隐藏它）。我认为你不能像在-makeKeyAndVisible那样在其他窗口前显示它; windows没有superview你可以调用-bringSubviewToFront：on IIRC。

• Call [window makeKeyAndVisible] on the old key window afterwards
• Set statusWindow.hidden = NO instead (but I don't see why it would be hidden by default). I don't think you can "display it in front of other windows" like -makeKeyAndVisible does; windows don't have a superview you can call -bringSubviewToFront: on IIRC.

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