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// This notification is posted after the user takes a screenshot (for example by pressing both the home and lock screen buttons)

UIKIT_EXTERN NSNotificationName const UIApplicationUserDidTakeScreenshotNotification NS_AVAILABLE_IOS(7_0);

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-(void)viewDidAppear:(

[super viewDidAppear:animated];

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

}

-(void)screenshots

{

UIAlertView *alert1 = [[UIAlertView alloc] initWithTitle:nil message:@

[alert1 show];

-(void)dealloc

{

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

}

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-(void)viewWillAppear:(BOOL)animated{

[super viewWillAppear:animated];

// 監測當前裝置是否處於錄屏狀態

UIScreen * sc = [UIScreen mainScreen];

if (@available(iOS 11.0, *)) {

if (sc.isCaptured) {

[self screenshots];

}

} else {

// Fallback on earlier versions

}

if (@available(iOS 11.0, *)) {

// 檢測到當前裝置錄屏狀態發生變化

[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(screenshots) name:UIScreenCapturedDidChangeNotification object:nil];

} else {

// Fallback on earlier versions

}

}

-(void) screenshots

{

UIAlertView *alert1 = [[UIAlertView alloc] initWithTitle:nil message:@"[安全提醒]該功能用於收付款時使用。不要截圖，錄製或分享給他人以保障資金賬戶安全。" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"確定", nil];

[alert1 show];

-(void)dealloc

{

if (@available(iOS 11.0, *)) {

[[NSNotificationCenter defaultCenter] removeObserver:self name:UIScreenCapturedDidChangeNotification object:nil];

} else {

// Fallback on earlier versions

}

}