產(chǎn)品需求：在APP內(nèi)部囱修，當(dāng)監(jiān)聽(tīng)到用戶有截屏行為的時(shí)候想诅，提示用戶進(jìn)行分享APP頁(yè)面吠卷，達(dá)到引流的效果锡垄；

廢話不多說(shuō)，直接上效果圖：

share.jpg

具體做法：

• 1.首先在 AppDelegate.m文件的方法didFinishLaunchingWithOptions里面設(shè)置監(jiān)聽(tīng)截屏行為

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
       [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(userDidTakeScreenshot:) name:UIApplicationUserDidTakeScreenshotNotification object:nil];
}

• 2.然后做監(jiān)聽(tīng)的處理祭隔，繪制獲取當(dāng)前屏幕的上下文货岭，輸入圖片

- (void)userDidTakeScreenshot:(NSNotification *)notification {
    UIImage *image = [self imageWithScreenshot];
    if(image) {
// WEGlobalShareView這個(gè)是繪制顯示的效果圖，頁(yè)面不復(fù)雜疾渴，小編就沒(méi)有放到這里來(lái)
        [WEGlobalShareView showWithDelegate:self andDetailImage:image];
    }
}
// 截取當(dāng)前屏幕 ,返回截取到的圖片
- (UIImage *)imageWithScreenshot {
    CGSize imageSize = CGSizeZero;
    UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;
    if (UIInterfaceOrientationIsPortrait(orientation)) {
        imageSize = [UIScreen mainScreen].bounds.size;
    } else {
        imageSize = CGSizeMake([UIScreen mainScreen].bounds.size.height, [UIScreen mainScreen].bounds.size.width);
    }
    // 繪制上下文
    UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0);
    CGContextRef context = UIGraphicsGetCurrentContext();
    for (UIWindow *window in [[UIApplication sharedApplication] 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);
        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();
    NSData *imageData = UIImagePNGRepresentation(image);
    return [UIImage imageWithData:imageData];
}

• 3.最后拿到圖片以后千贯，進(jìn)行分享頁(yè)面即可；