使用另一个NSArray作为指南对NSArray进行排序(Sorting an NSArray using another NSArray as a guide)

使用另一个NSArray作为指南对NSArray进行排序(Sorting an NSArray using another NSArray as a guide)

所以，想象你有几个数组，颜色和形状，就像这样：

Colors: { Yellow, Blue, Red } Shapes: { Square, Circle, Diamond }

现在，如果我想按照字母顺序排列颜色，我可以这样做：

NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:nil ascending:YES selector:@selector(localizedCompare:)]; NSArray *sortedColors = [colors sortedArrayUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]]; [sortDescriptor release];

但是，如何将Shapes排序为与重新排序Colors相同的顺序。 我不是说按字母顺序放置图形 - 我的意思是把形状按颜色的字母顺序排列......？

So, imagine you have a couple of arrays, Colors and Shapes, like this:

Colors: { Yellow, Blue, Red } Shapes: { Square, Circle, Diamond }

Now, if I want to sort Colors into alphabetical order I can do something like this:

NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:nil ascending:YES selector:@selector(localizedCompare:)]; NSArray *sortedColors = [colors sortedArrayUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]]; [sortDescriptor release];

But how would I sort the Shapes into the same order that I re-ordered Colors. I don't mean put Shapes into alphabetical order - I mean put Shapes into Colors' alphabetical order...?

最满意答案

最简单的方法可能是这样的：

NSDictionary *dict = [NSDictionary dictionaryWithObjects:colors forKeys:shapes]; NSArray *sortedShapes = [dict keysSortedByValueUsingSelector:@selector(localizedCompare:)];

Easiest way is probably this:

NSDictionary *dict = [NSDictionary dictionaryWithObjects:colors forKeys:shapes]; NSArray *sortedShapes = [dict keysSortedByValueUsingSelector:@selector(localizedCompare:)];