Xcode Objective-C ShotBlocker：如何检测和阻止屏幕截图

Question

在我创建的应用程序中，您不能截屏。我想知道您如何检测和阻止屏幕截图。我发现您可以使用 ShotBlocker 做到这一点，但我不知道如何做。有谁知道如何检测和阻止 Objective-C 中的屏幕截图？

Answer 1

无法在 iOS 上屏蔽屏幕截图。至少你可以检测到这样截屏后：

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(screenshotDetected) name:UIApplicationUserDidTakeScreenshotNotification object:nil];
}

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];

    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationUserDidTakeScreenshotNotification object:nil];
}

- (void)screenshotDetected {

    UIAlertView * alert =[[UIAlertView alloc ] initWithTitle:@"Hey!"
                                                     message:@"You're not allowed to do that"
                                                    delegate:self
                                           cancelButtonTitle:@"Cancel"
                                           otherButtonTitles: nil];
    [alert addButtonWithTitle:@"GO"];
    [alert show];
}