ios - 从两个较小的 UIImage 创建 UIImage

Question

我有两个 UIImage 实例。我怎样才能创建第三个 UIImage 这只是拼接在一起的两个原始图像？我想要第一张图片在顶部，第二张图片在底部，这样顶部图片的底部边缘与底部图像的顶部边缘齐平。

Answer 1

像这样的东西应该可以工作(虽然我还没有测试过)

-(UIImage *)imageWithTopImage:(UIImage *)topImage bottomImage:(UIImage *)bottomImage
{
    UIGraphicsBeginImageContext(CGSizeMake(topImage.size.width, topImage.size.height + bottomImage.size.height);
    [topImage drawInRect:CGRectMake(0, 0, topImage.size.width, topImage.size.height)];
    [bottomImage drawInRect:CGRectMake(0, topImage.size.width, bottomImage.size.width, bottomImage.size.height)];
    UIImage *combinedImage = UIGraphicsGetImageFromCurrentImageContext();    
    UIGraphicsEndImageContext();
    return combinedImage;
}