iOS开发之截屏分享功能

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

UIWindow *window = [[[UIApplication sharedApplication] delegate] window];
    // 1.开启上下文
    UIGraphicsBeginImageContextWithOptions(window.bounds.size, window.opaque, 0);
    // 2.渲染
    [window drawViewHierarchyInRect:window.bounds afterScreenUpdates:NO];
    // 3.获取图片
    UIImage *snapshotImage=UIGraphicsGetImageFromCurrentImageContext();
    // 4.结束上下文
    UIGraphicsEndImageContext();