iphone - 如何将 x 个 UIImages 连接在一起？

Question

我希望将一些图像拼接在一起，这些图像始终添加到前一个图像的底部。

例如我有图像 A、B 和 C。我希望它们彼此重叠，如下所示:

A
B
C

最好的方法是什么？

谢谢!

Answer 1

我最终这样做了:

+ (UIImage *)joinImages:(UIImage *)im1 secondImage:(UIImage *)im2 thirdImage:(UIImage *)im3
{
//Joins 3 UIImages together, stitching them vertically
CGSize size = CGSizeMake(320, 480);
UIGraphicsBeginImageContext(size);

CGPoint image1Point = CGPointMake(0, 0);
[im1 drawAtPoint:image1Point];

CGPoint image2Point = CGPointMake(0, im1.size.height);
[im2 drawAtPoint:image2Point];

CGPoint image3Point = CGPointMake(0, im1.size.height +im2.size.height);
[im3 drawAtPoint:image3Point];

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

return finalImage;
}