合并两个UIImages [英] Merge two UIImages

问题描述

我有imageA（取自用户的iPhone相机）和imageB，一个带有傻边框（例如）的图像，有足够的透明alpha空间。

I have imageA (taken from the users iPhone camera) and imageB, an image with a silly boarder (for eg) with plenty of transparent alpha space.

什么我想要做的是合并这两个图像，将imageB放在imageA上，然后将它们保存为imageC用于其他工作。

What I would like to to do is to merge these two images, laying imageB over imageA, and then saving them as imageC for other work.

有没有办法做到这一点？

Is there a way to do this?

干杯

到目前为止我已经得到了这个

I've got this so far

-(void)merge
{
    CGSize size = CGSizeMake(320, 480);
    UIGraphicsBeginImageContext(size);

    CGPoint thumbPoint = CGPointMake(0,0);
    UIImage *imageA = imageView.image;
    [imageA drawAtPoint:thumbPoint];

    UIImage* starred = [UIImage imageNamed:@"imageB.png"];

    CGPoint starredPoint = CGPointMake(0, 0);
    [starred drawAtPoint:starredPoint];

    UIImage *imageC = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    imageView.image = imageC;
}

我看不到/不知道我在这里做错了什么

I can't see/dont know what I'm doing wrong here

推荐答案

该代码看起来是正确的（尽管我建议将其转换为使用创建的 CGBitmapContext for thread-safety），但是 imageB 应该是JPEG？ JPEG不支持透明度，因此，为了使混合工作，它应该是PNG。

That code looks correct (though I would recommend converting it to use a created CGBitmapContext for thread-safety), but is imageB supposed to be a JPEG? JPEGs don't support transparency, so, in order for the blending to work, it should really be a PNG.

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