1.普通界面

    /**        *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];                            }  

2.UIScrollView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!");                    }        }