在数组排序字典？ [英] Sort Dictionaries in Array?

问题描述

我需要排序nsdictionaries的一个NSMutableArray，使用密钥的对象从字典。对象是一个NSNumber。如何将我的第一个对象是最高的NSNumber在NSMutableArray里的字典排序？

I need to sort an nsmutablearray of nsdictionaries, using a keyed object from the dictionary. The object is an NSNumber. How would I sort the dictionaries in the nsmutablearray with the first object being the highest nsnumber?

谢谢！

推荐答案

通过使用<定义一个定制的比较href=\"http://developer.apple.com/library/ios/#featuredarticles/Short_Practical_Guide_Blocks/_index.html\">block （你可以去其他的方式，但这是相当紧凑）：

With a custom comparator defined with a block (you can go other ways but this is quite compact):

NSComparator mysort = ^(id dict1, id dict2) {
    NSNumber n1 = [dict1 objectForKey:@"key"];
    NSNumber n2 = [dict2 objectForKey:@"key"];
    return (NSComparisonResult)[n1 compare:n2];
};

[yourArray sortUsingComparator:mysort];

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