objectc NSArray排序小结

转自Rainbird的个人博客

ios的排序不知道是用强大来形容呢，还是要用复杂来形容，反正觉得不如php一个sort函数来的简洁，每次用排序都得去网上现查怎么实现，这不查的次数多了也便有了这个小小的总结。

1.升序排列

 NSArray *_firstArray = [NSArray arrayWithObjects:@"ccccc",@"bbbbb",@"ddddd",@"aaaaa",nil];
  NSArray *_sortedArray= [_firstArray sortedArrayUsingSelector:@selector(compare:)];
  NSLog(@"未排序:%@",_firstArray);
  NSLog(@"排行后:%@",_sortedArray);

2012-03-19 23:17:06.748 IOSSortArray[1761:f803] 未排序:(
    ccccc,
    bbbbb,
    ddddd,
    aaaaa
)
2012-03-19 23:17:06.749 IOSSortArray[1761:f803] 排行后:(
    aaaaa,
    bbbbb,
    ccccc,
    ddddd
)

2.降序排列

  NSMutableArray *_reSortArray= [[NSMutableArray alloc] init];
  for (id _obj in [_sortedArray reverseObjectEnumerator]) {
    [_reSortArray addObject:_obj];
  }
  NSLog(@"降序排列:%@",_reSortArray);
  [_reSortArray release];

2012-03-19 23:27:20.789 IOSSortArray[2011:f803] 排行后:(
    aaaaa,
    bbbbb,
    ccccc,
    ddddd
)
2012-03-19 23:27:20.790 IOSSortArray[2011:f803] 降序排列:(
    ddddd,
    ccccc,
    bbbbb,
    aaaaa
)

3.数组里的字典排序(NSDirector排序)

  NSMutableArray *_mutiArray = [[NSMutableArray alloc] init];
  [_mutiArray addObject:[NSDictionary dictionaryWithObjectsAndKeys:@"rainbird",@"name",@"ddabc",@"work", nil]];
  [_mutiArray addObject:[NSDictionary dictionaryWithObjectsAndKeys:@"ainbird",@"name",@"ccabc",@"work", nil]];
  [_mutiArray addObject:[NSDictionary dictionaryWithObjectsAndKeys:@"inbird",@"name",@"fdabc",@"work", nil]];
  [_mutiArray addObject:[NSDictionary dictionaryWithObjectsAndKeys:@"bird",@"name",@"agbc",@"work", nil]];
  [_mutiArray addObject:[NSDictionary dictionaryWithObjectsAndKeys:@"rd",@"name",@"abac",@"work", nil]];
  
  NSSortDescriptor *_sorter  = [[NSSortDescriptor alloc] initWithKey:@"name" 
                                                           ascending:YES];
  NSSortDescriptor *_sorter2 = [[NSSortDescriptor alloc] initWithKey:@"work" 
                                                           ascending:YES];
  NSLog(@"未排序:\n%@",_mutiArray);
  NSLog(@"根据name排序:\n%@",[_mutiArray sortedArrayUsingDescriptors:[NSArray arrayWithObjects:_sorter, nil]]);
  NSLog(@"根据work排序:\n%@",[_mutiArray sortedArrayUsingDescriptors:[NSArray arrayWithObjects:_sorter2, nil]]);
  
  [_mutiArray release];
  [_sorter release];
  [_sorter2 release];

2012-03-19 23:34:37.489 IOSSortArray[2119:f803] 未排序:
(
        {
        name = rainbird;
        work = ddabc;
    },
        {
        name = ainbird;
        work = ccabc;
    },
        {
        name = inbird;
        work = fdabc;
    },
        {
        name = bird;
        work = agbc;
    },
        {
        name = rd;
        work = abac;
    }
)
2012-03-19 23:34:37.490 IOSSortArray[2119:f803] 根据name排序:
(
        {
        name = ainbird;
        work = ccabc;
    },
        {
        name = bird;
        work = agbc;
    },
        {
        name = inbird;
        work = fdabc;
    },
        {
        name = rainbird;
        work = ddabc;
    },
        {
        name = rd;
        work = abac;
    }
)
2012-03-19 23:34:37.491 IOSSortArray[2119:f803] 根据work排序:
(
        {
        name = rd;
        work = abac;
    },
        {
        name = bird;
        work = agbc;
    },
        {
        name = ainbird;
        work = ccabc;
    },
        {
        name = rainbird;
        work = ddabc;
    },
        {
        name = inbird;
        work = fdabc;
    }
)

ok,that’s all 源文件下载

补充:
sortedArrayUsingSelector:@selector(caseInsensitiveCompare:) //不区分大小排序