Question

我希望将2个UIImageView中的2个图像合并为1个图像，并在屏幕上显示“正确”的位置，角度，比例比例。

在我的项目中，有2个UIImageView - imageView是主要的UIImageView - topImageView是叠加UIImageView，可以拖动，旋转，缩放

我可以通过绘制2张图像来保存合并的图像，但错误的位置，角度，比例尺。

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！

Answer 1

将这两个图像作为子视图添加到UIView。做你需要的图像，然后像这样拍摄UIVIew的快照：

UIGraphicsBeginImageContext(view.bounds.size);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *MergedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

Answer 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];

如何将2个UIImageView中的2个图像合并为1个图像

2 个答案: