iOS 屏幕截图

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/**   *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）

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/**   *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!" );           }  }