查看所有内容：UIWindow子视图VS UIViewController子视图 [英] View on top of everything: UIWindow subview VS UIViewController subview

问题描述

为了在所有视图之上制作 UIView ，例如 UIAlertView 的行为，最好的方法是看看是通过将它放在应用程序窗口中，这是通过将视图添加到：

In order to make a UIView on top of all views like the behavior of UIAlertView, the best way I see is by putting it in the app window, which is by adding the view to:

[[[UIApplication sharedApplication] delegate] window]

然而，我发现它的缺点是它不会自动轮换。为了使它旋转，最好的方法是在当前的AppDelegate上添加视图 window.navigationController / rootViewController

However, the downside I found is that it doesn't automatically take in rotation. In order for it to take in rotation, the best way to do is by adding the view on current AppDelegate window.navigationController/rootViewController, however, by doing this it will no longer be on top of everything. Let say when view is displaying and there is a modalViewController popup, the modal view will certainly cover up the view.

我的问题是，是否可以将子视图添加到最顶层的窗口和支持方向？在这种情况下，我需要两组Nib文件吗？ UIAlertView 如何结合最顶层和最高级别的魔力？定向支持？当我查看 UIAlertView.h 时，我发现实际上有2个 UIWindows ，一次被称为 originalWindow 和另一个名为 dimWindow 。有没有我可以找到 UIAlertView.m 源代码的地方？

My question is, is it possible to add subview to the top most window and support orientation? Do I need two set of Nib file in this case? How UIAlertView does the magic to combine the topmost & orientation support? When I look into the UIAlertView.h, I see there is actually 2 UIWindows, once is called originalWindow and another called dimWindow. Is there a place where I can find the source code for UIAlertView.m?

推荐答案

我发现的最佳解决方案是创建一个透明的容器视图，将该容器添加到窗口，并将警报放在容器中。然后，您可以注册 UIApplicationWillChangeStatusBarOrientationNotification 以接收轮换事件并转换容器;这允许您独立操作警报的框架：

The best solution I've found is to create a transparent container view, add that container to the window, and place your alert inside the container. You may then register for UIApplicationWillChangeStatusBarOrientationNotification to receive rotation events and transform the container; this allows you to independently manipulate the frame of the alert:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{
     ...
     self.container = [[UIView alloc] initWithFrame:self.window.bounds];
     [self.container addSubview:self.alertView];
     [self.window addSubview:self.container];
     [[NSNotificationCenter defaultCenter] addObserver:self 
                                              selector:@selector(statusBarWillRotate:) 
                                                  name:UIApplicationWillChangeStatusBarOrientationNotification 
                                                object:nil];
     ...
}
...
- (void)statusBarWillRotate:(NSNotification *)theNotification
{
    CGFloat rotation = 0;
    switch ([notification[UIApplicationStatusBarOrientationUserInfoKey] intValue])
    {
        case UIInterfaceOrientationLandscapeLeft:
            rotation = -M_PI_2;
            break;
        case UIInterfaceOrientationLandscapeRight:
            rotation = M_PI_2;
            break;
        case UIInterfaceOrientationPortraitUpsideDown:
            rotation = M_PI;
            break;
        case UIInterfaceOrientationPortrait: 
        default:
            rotation = 0;
            break;
    }
    CGAffineTransform rotationTransform = CGAffineTransformMakeRotation(rotation);
    CGSize rotatedSize = CGRectApplyAffineTransform(self.window.bounds, rotationTransform).size;
    [UIView animationWithDuration:[UIApplication sharedApplication].statusBarOrientationAnimationDuration
                       animations:^{
         self.container.transform = rotationTransform;
         // Transform invalidates the frame, so use bounds/center
         self.container.bounds = CGRectMake(0, 0, rotatedSize.width, rotatedSize.height);
         self.container.center = CGPointMake(self.window.bounds.size.width / 2, self.window.bounds.size.height / 2);
     }];
}

如果你真的想要的话，你可以用它的<创建一个全新的窗口code> windowLevel 属性设置为 UIWindowLevelAlert ，这将保证窗口保持在所有其他视图之上，包括键盘，但窗口管理变得有点棘手。上述解决方案应该足以满足大多数需求。

You can, if you really want, create an entirely new window with its windowLevel property set to UIWindowLevelAlert, which will guarantee that the window remain above all other views, including the keyboard, but window management gets a littly tricky. The above solution should suffice for most needs.

简单地将视图控制器的视图添加到窗口的问题是它不能保证接收所有旋转和 view [Will | Did] [Disa | A] ppear：消息，除非通过 addChildViewController将其添加到视图控制器层次结构：根视图控制器上的。

The problem with simply adding a view controller's view to a window is that it is not guaranteed to receive all the rotation and view[Will|Did][Disa|A]ppear: messages unless it is added to the view controller hierarchy via addChildViewController: on the root view controller.

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