Objective-C 快速排序

  //  數組排序
    
    NSArray *listGroupname = [self.listTeams sortedArrayUsingComparator:^(NSString *n1,NSString *n2) {
        
        NSString *val1 = [[NSString alloc]init];
        
        NSString *val2 = [[NSString alloc]init];
        
        if (val1 > val2) {
            
            return  NSOrderedAscending;
            
        } else {
            
            return NSOrderedDescending;
            
        }
    
    }];
 
  
 // 字典排序
/** dic按key排序而不是按插入時間，因此須要從新排序，獲得排好序的key */
    NSArray *sortedKeys = [callDataDic keysSortedByValueUsingComparator:^NSComparisonResult(id obj1, id obj2) {
        if ([obj1 longLongValue] > [obj2  longLongValue]) {
            return (NSComparisonResult)NSOrderedAscending;
        }
        if ([obj1 longLongValue] < [obj2 longLongValue]) {
            return (NSComparisonResult)NSOrderedDescending;
        }
        return (NSComparisonResult)NSOrderedSame;
    }];