2

我想将 2 UIImageView 中的 2 个图像合并为 1 个具有“正确”位置、角度、比例比例的图像，正如我在屏幕上看到的那样。

在我的项目中，有 2 个 UIImageView - imageView 是主 UIImageView - topImageView 是可以拖动、旋转、缩放的覆盖 UIImageView

我可以保存通过绘制 2 张图像合并的图像，但位置、角度、比例比例错误。

这是我的代码：

UIImage *img = topImageView.image;
UIImage *bottomImg = self.imageView.image;
CGSize bounds = self.imageView.image.size;

UIGraphicsBeginImageContext(bounds);
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextTranslateCTM(ctx, topImageView.image.size.width * 0.5, topImageView.image.size.height * 0.5);
CGFloat angle = atan2(topImageView.transform.b, topImageView.transform.a);
CGContextRotateCTM(ctx, angle);

[topImageView.image drawInRect:CGRectMake(-topImageView.image.size.width * 0.5,
                                          -topImageView.image.size.height * 0.5,
                                          topImageView.image.size.width,
                                          topImageView.image.size.height)];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

UIGraphicsBeginImageContext(bounds);
[bottomImg drawInRect:CGRectMake(0, 0, bounds.width, bounds.height)];
[newImage drawInRect:CGRectMake(topImageView.frame.origin.x,
                                topImageView.frame.origin.y,
                                newImage.size.width,
                                newImage.size.height)];
UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

有什么想法可以帮助我吗？非常感谢！

4

2 回答 2

6

将这两个图像作为子视图添加到 UIView。对图像执行您需要的操作，然后像这样拍摄 UIVIew 的快照：

UIGraphicsBeginImageContext(view.bounds.size);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *MergedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
于 2012-12-26T14:16:56.523 回答
2

试试这个

#pragma mark - Marge two Images 

- (UIImage *) addImageToImage:(UIImage *)img withImage2:(UIImage *)img2{

    CGSize size = CGSizeMake(imageView.image.size.width, imageView.image.size.height);
    UIGraphicsBeginImageContext(size);

    CGPoint pointImg1 = CGPointMake(0,0);
    [img drawAtPoint:pointImg1]; 

    CGPoint pointImg2 = CGPointMake(0,0);
    [img2 drawAtPoint: pointImg2];

    UIImage* result = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return result;
}


[self addImageToImage:imageView.image withImage2:imageView2.image];
于 2012-12-26T14:21:43.130 回答