iphone - 对字典对象数组进行排序

Question

我遇到的问题是我无法对 NSMutableDictionary 对象的 NSMutableArray 进行排序，我想按评级对对象进行排序，评级是 NSNumber，我错过了什么？

我当前的代码总结了“arrayMealRating”中的所有评级并对结果数组进行排序：

            [arrayMealRating addObject:[NSMutableDictionary dictionaryWithObjectsAndKeys:
                                        [eachObject objectForKey:@"Airline"], @"Airline"
                                        ,[eachObject objectForKey:@"setMealRating"], @"setMealRating"
                                        , nil]];

        }
        NSArray *airlineNames = [arrayMealRating valueForKeyPath:@"@distinctUnionOfObjects.Airline"];

        // Loop through all the airlines
        for (NSString *airline in airlineNames) {

            // Get an array of all the dictionaries for the current airline
            NSPredicate *predicate = [NSPredicate predicateWithFormat:@"(Airline == %@)", airline];
            NSArray *airlineMealRating = [arrayMealRating filteredArrayUsingPredicate:predicate];

            // Get the sum of all the ratings using KVC @sum collection operator
            NSNumber *rating = [airlineMealRating valueForKeyPath:@"@sum.setMealRating"];

            //NSLog(@"%@: %@", airline, rating);
            [sortedMealArray addObject:[NSMutableDictionary dictionaryWithObjectsAndKeys:
                                        airline, @"Airline"
                                        ,[rating stringValue], @"setMealRating"
                                      , nil]];
        }



        NSSortDescriptor *descriptor = [[NSSortDescriptor alloc] initWithKey:@"setMealRating"  ascending:YES];
        [sortedMealArray sortedArrayUsingDescriptors:[NSMutableArray arrayWithObjects:descriptor,nil]];
        auxMealRating = [sortedMealArray copy];

有任何疑问，请不要投反对票，只要问，我会编辑问题。

最好的问候和对不起我糟糕的英语。

Answer 1

这应该做你想要的：

NSArray *sortedArray = [arrayMealRating sortedArrayUsingComparator:^(id obj1, id obj2) {
    NSNumber *rating1 = [(NSDictionary *)obj1 objectForKey:@"setMealRating"];
    NSNumber *rating2 = [(NSDictionary *)obj2 objectForKey:@"setMealRating"];
    return [rating1 compare:rating2];
}];