iOS截屏代码

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];
    
}

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!");
    }
}