继接到电话状态监听的需求之后再次添加了截屏状态的监听,当使用 App 时若用户执行截屏操作需要对当前状态进行监听操作,下面有两种方法,其中可以替换截屏的图片内容(Plan A),也可以弹出提示框(Plan B),废话不多说步骤如下.
#pragma mark - 监听截屏
// Plan A
/**
监听设备截屏
*/
- (void)registerTakeScreenShotNotice {
kWeakSelf(self);
NSOperationQueue *mainQueue = [NSOperationQueue mainQueue];
[kNotificationCenter addObserverForName:UIApplicationUserDidTakeScreenshotNotification
object:nil
queue:mainQueue
usingBlock:^(NSNotification * _Nonnull note) {
NSLog(@"考试截屏");
[weakself userDidTakeScreenshot];//屏幕响应
}];
}
/**
截屏响应
*/
- (void)userDidTakeScreenshot {
NSLog(@"检测到截屏");
//人为操作,获取截屏图片数据
UIImage *image = [self imageWithScreenshot];
NSLog(@"userDidTakeScreenshot:\n%@", image);
UIImageView *imageScreenshot = [[UIImageView alloc] initWithImage:image];// 此处 image 资源可根据实际需求进行操作,展示当前截屏图片或者替换成一张固定的图片方式等等等!
imageScreenshot.frame = CGRectMake(SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2, SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2);
[self.wkWebView addSubview:imageScreenshot];// 展示在当前 View 层级
}
/**
返回截屏数据
@return 返回截屏数据
*/
- (UIImage *)imageWithScreenshot {
NSData *imageData = [self dataWithScreenshotInPNGFormat];
return [UIImage imageWithData:imageData];
}
/**
获取当前屏幕
@return 获取当前屏幕
*/
- (NSData *)dataWithScreenshotInPNGFormat {
// Source (Under MIT License):
CGSize imageSize = CGSizeZero;
UIInterfaceOrientation orientation = kApplication.statusBarOrientation;
if (UIInterfaceOrientationIsPortrait(orientation)) {
imageSize = SCREEN_RECT.size;
}
else {
imageSize = CGSizeMake(SCREEN_HEIGHT, SCREEN_WIDTH);
}
UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0);
CGContextRef context = UIGraphicsGetCurrentContext();
for (UIWindow *window in [kApplication windows]) {
CGContextSaveGState(context);
CGContextTranslateCTM(context, window.center.x, window.center.y);
CGContextConcatCTM(context, window.transform);
CGContextTranslateCTM(context, -window.bounds.size.width * window.layer.anchorPoint.x, -window.bounds.size.height * window.layer.anchorPoint.y);
// Correct for the screen orientation
if (orientation == UIInterfaceOrientationLandscapeLeft) {
CGContextRotateCTM(context, M_PI_2);
CGContextTranslateCTM(context, 0, -imageSize.width);
}
else if (orientation == UIInterfaceOrientationLandscapeRight) {
CGContextRotateCTM(context, -M_PI_2);
CGContextTranslateCTM(context, -imageSize.height, 0);
}
else if (orientation == UIInterfaceOrientationPortraitUpsideDown) {
CGContextRotateCTM(context, M_PI);
CGContextTranslateCTM(context, -imageSize.width, -imageSize.height);
}
if ([window respondsToSelector:@selector(drawViewHierarchyInRect:afterScreenUpdates:)]) {
[window drawViewHierarchyInRect:window.bounds afterScreenUpdates:YES];
}
else {
[window.layer renderInContext:context];
}
CGContextRestoreGState(context);
}
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return UIImagePNGRepresentation(image);
}
// Plan B
- (void)intercepScreenshots {
// kWeakSelf(self);
// NSOperationQueue *mainQueue = [NSOperationQueue mainQueue];
// [kNotificationCenter addObserverForName:UIApplicationUserDidTakeScreenshotNotification object:nil queue:mainQueue usingBlock:^(NSNotification * _Nonnull note) {
// [weakself checkScreenshots];
// }];
[kNotificationCenter addObserver:self
selector:@selector(checkScreenshots)
name:UIApplicationUserDidTakeScreenshotNotification
object:nil];
}
- (void)checkScreenshots {
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"提示"
message:@"勿截图"
delegate:self
cancelButtonTitle:@"YES"
otherButtonTitles:@"NO", nil];
[alertView show];
}
此次分享到此结束,希望内容能对大家实际有所帮助,有什么不足之处欢迎指点共同进步!
