iOS开发之代码截图

用Quartz2D

    CGSize imageSize = self.view.bounds.size;
    //开启图形上下文
    UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0);
    //获得图形上下文
    CGContextRef context = UIGraphicsGetCurrentContext();
    //将View渲染到图形上下文
    [self.view.layer renderInContext:context];
    //从上下文中取得图像
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    
    UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
    //切割图片
    CGImageRef subimageRef = CGImageCreateWithImageInRect(image.CGImage, CGRectMake(0, 0, 320, 320));
    UIImage *subImage1 = [UIImage imageWithCGImage:subimageRef];
    
    UIImageWriteToSavedPhotosAlbum(subImage1, nil, nil, nil);
    
    UIGraphicsEndImageContext();