object-c NSArray排序小结

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


[常州]-小辉 补充:
sortedArrayUsingSelector:@selector(caseInsensitiveCompare:) //不区分大小排序

哈哈这么说来再扩展一下的话,还有更多的选择,比如数字排序,只根据第几位到第几位排序等
- (NSComparisonResult)compare:(NSString *)string;

  • (NSComparisonResult)compare:(NSString *)string options:(NSStringCompareOptions)mask;
  • (NSComparisonResult)compare:(NSString *)string options:(NSStringCompareOptions)mask range:(NSRange)compareRange;
  • (NSComparisonResult)compare:(NSString *)string options:(NSStringCompareOptions)mask range:(NSRange)compareRange locale:(id)locale; // locale arg used to be a dictionary pre-Leopard. We now accepts NSLocale. Assumes the current locale if non-nil and non-NSLocale.
  • (NSComparisonResult)caseInsensitiveCompare:(NSString *)string;
  • (NSComparisonResult)localizedCompare:(NSString *)string;
  • (NSComparisonResult)localizedCaseInsensitiveCompare:(NSString *)string;

/ localizedStandardCompare:, added in 10.6, should be used whenever file names or other strings are presented in lists and tables where Finder-like sorting is appropriate. The exact behavior of this method may be tweaked in future releases, and will be different under different localizations, so clients should not depend on the exact sorting order of the strings.
/

  • (NSComparisonResult)localizedStandardCompare:(NSString *)string NS_AVAILABLE(10_6, 4_0);
    哎,选择多太多,就是复杂:)

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2 Responses to object-c NSArray排序小结

  1. Reilost says:

    array还有一种比较常用

    NSSortDescriptor* desc = [NSSortDescriptor sortDescriptorWithKey:@”id” ascending:YES];
    [array sortUsingDescriptors:[NSArray arrayWithObject:desc]];

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