iphone - 如何在整个屏幕上添加图像

Question

我试图将覆盖图像放在整个 iPhone 屏幕上（也在导航和标签栏上），但没有任何反应。viewDidLoad

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;

这是我想要得到的结果：

Answer 1

由于UIWindow是 的子类UIView，因此您还可以将子视图添加到关键窗口。
这些子视图将出现在任何视图控制器之上。

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

Answer 2

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