ios - 从两个较小的 UIImage 创建一个 UIImage

Question

我有两个UIImage. 如何创建UIImage仅将两个原始图像拼接在一起的第三个？我想要顶部的第一张图像和底部的第二张图像，这样顶部图像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;
}