iOS字母排序、数字排序

NSMutableArray *_array = [[NSMutableArray
alloc] initWithObjects:@"4",
@"1", @"10",
@"2", nil];


_array = [[NSMutableArray
alloc] initWithArray:[_array
sortedArrayUsingComparator:^NSComparisonResult(id obj1,
id obj2) {



// return [obj1 compare:obj2 options:NSNumericSearch]; //a按照首位排序

return [obj1
compare:obj2 options:NSForcedOrderingSearch];


}]];

_array = [[NSMutableArray
alloc] initWithArray:[_array
sortedArrayUsingSelector:@selector(compare:)]];

//

NSMutableArray *_allKeys = [[NSMutableArray
alloc]initWithArray:[self.dataDic
allKeys]];

//升序排序
_allKeys = [[NSMutableArray
alloc]initWithArray:[_allKeys
sortedArrayUsingSelector:@selector(compare:)]];
_allKeys = [[NSMutableArray
alloc]initWithArray:[_allKeys
sortedArrayUsingComparator:^NSComparisonResult(id obj1,
id obj2) {

return [obj1
compare:obj2 options:NSNumericSearch] ==
NSOrderedDescending;
}]];

NSLog(@"_allKeys%@",_allKeys);

参考文章：http://blog.csdn.net/tetrisos/article/details/7671282 http://hi.baidu.com/ivan_xu/item/5d897c14d51bffe0ddeeca7c http://code4app.com/snippets/one/排序/521dc6836803fad866000000