/**

 *截图功能

 */

-(void)screenShot{

    UIGraphicsBeginImageContextWithOptions(CGSizeMake(640, 960), YES, 0);

    //设置截屏大小

    [[self.view layer] renderInContext:UIGraphicsGetCurrentContext()];

    UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    CGImageRef imageRef = viewImage.CGImage;

    CGRect rect = CGRectMake(0, 0, 641, SCREEN_HEIGHT + 300);//这里可以设置想要截图的区域

    CGImageRef imageRefRect =CGImageCreateWithImageInRect(imageRef, rect);

    UIImage *sendImage = [[UIImage alloc] initWithCGImage:imageRefRect];

 

//以下为图片保存代码

UIImageWriteToSavedPhotosAlbum(sendImage, nil, nil, nil);//保存图片到照片库

    NSData *imageViewData = UIImagePNGRepresentation(sendImage);

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

    NSString *documentsDirectory = [paths objectAtIndex:0];

    NSString *pictureName= @"screenShow.png";

    NSString *savedImagePath = [documentsDirectory stringByAppendingPathComponent:pictureName];

    [imageViewData writeToFile:savedImagePath atomically:YES];//保存照片到沙盒目录

    CGImageRelease(imageRefRect);    

//从手机本地加载图片

UIImage *bgImage2 = [[UIImage alloc]initWithContentsOfFile:savedImagePath];

   

}

2UIScrollView截屏（一屏无法显示完整）

/**

 *截图

 */

- (void)screenShot{

    UIImage* image = nil;

    UIGraphicsBeginImageContext(m_scrollView.contentSize);

    {

        CGPoint savedContentOffset = m_scrollView.contentOffset;

        CGRect savedFrame = m_scrollView.frame;

        m_scrollView.contentOffset = CGPointZero;

        m_scrollView.frame = CGRectMake(0, 0, m_scrollView.contentSize.width, m_scrollView.contentSize.height);       [m_scrollView.layer renderInContext: UIGraphicsGetCurrentContext()];

        image = UIGraphicsGetImageFromCurrentImageContext();     

        m_scrollView.contentOffset = savedContentOffset;

        m_scrollView.frame = savedFrame;

    }

    UIGraphicsEndImageContext();    

    if (image != nil) {

        NSLog(@"截图成功!");

    }

}