iOS截屏代码

转载自：http://m.open-open.com/m/code/view/1420469506375

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!");  

        }
    }  
截全屏的代码：

- (UIImage*)screenView:(UIView *)view{
    CGRect rect = view.frame;
	    UIGraphicsBeginImageContext(rect.size);
	    CGContextRef context = UIGraphicsGetCurrentContext();
	    [view.layer renderInContext:context];
	    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
	    UIGraphicsEndImageContext();
	    return img;
}
如果需要导航栏也截取的话

把[view.layer renderInContext:context]改成

[self.navigationController.view.layer renderInContext:context]