NSSortDescriptor 根据Model里某个参数，针对数据进行升序降序排序

NSArray *AllData=[WeatherNewModel objectArrayWithKeyValuesArray:jsonObject];

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NSSortDescriptor *priceDescriptor = [NSSortDescriptor

sortDescriptorWithKey:@"signalOrder"

ascending:YES

selector:@selector(compare:)];

NSSortDescriptor *modelDescriptor = [NSSortDescriptor

sortDescriptorWithKey:@"paramCode"

ascending:YES

selector:@selector(caseInsensitiveCompare:)];

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NSArray *descriptors = @[priceDescriptor, modelDescriptor];

NSArray *sortArray=[AllData sortedArrayUsingDescriptors:descriptors];

根据Model里某个参数，针对数据进行升序降序排序

如果待比较的属性是字符串(NSString)类型, 可使用其默认的方法: localizedStandardCompare:

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