如何在整个屏幕上添加图像

Question

我正试图将覆盖图像放在整个iPhone屏幕上（通过导航和标签栏）来自viewDidLoad，但没有任何反应。
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self.imageView = [[UIImageView alloc]
                              initWithImage:[UIImage imageNamed:@"overlayimage.png"]];
UIWindow* window = [[UIApplication sharedApplication] keyWindow];
    [window.rootViewController.view addSubview: imageView];

UITapGestureRecognizer * recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)];
    recognizer.delegate = self;
    [imageView addGestureRecognizer:recognizer];
    imageView.userInteractionEnabled =  YES;
    self.imageView = imageView;

这是我想要获得的结果：

Answer 1

由于UIWindow是UIView的子类，您还可以将子视图添加到关键窗口。
这些子视图将显示在任何视图控制器上方。

UIWindow *keyWindow = [[[UIApplication sharedApplication] delegate] window];
[keyWindow addSubview:imageView];

Answer 2

imageView.frame = [[UIScreen mainScreen] applicationFrame];
[self.navigationController.view addSubview: imageView];