iOS 数组排序

-(void)sortArrayDatas{
    [array_datas sortUsingComparator:^NSComparisonResult(id  _Nonnull obj1, id  _Nonnull obj2) {
        RainfallStations *station_One = obj1;
        RainfallStations *station_Two = obj2;
        
        double totalRain_one = station_One.totalRain;
        double totalRain_two = station_Two.totalRain;
        if (totalRain_one>totalRain_two) {
            return NSOrderedAscending;
        }
        else if (totalRain_one < totalRain_two){
            return NSOrderedDescending;
        }else{
            return NSOrderedSame;
        }
    }];
}