IOS数组的排序和筛选

            [self.tableItems sortUsingComparator:^NSComparisonResult(GPBTeacherBrief* obj1, GPBTeacherBrief* obj2) {
                if (obj1.distanceFromMe < obj2.distanceFromMe) {
                    return NSOrderedAscending;
                }else if(obj1.distanceFromMe == obj2.distanceFromMe){
                    return NSOrderedSame;
                }else{
                    return NSOrderedDescending;
                }
            }];

            NSPredicate* predicate = [NSPredicate predicateWithFormat:@"(startingPrice > 200) AND (startingPrice <= 500)"];
            [self.tableItems filterUsingPredicate:predicate];