//初始化可变数组

         NSMutableArray *arr1=[NSMutableArray arrayWithObjects:@"giu",@"min",@"Deng",@"liumin", nil];

         //字符串排序

         //创建排序描述符对象NSSortDescriptor，key为空，ascending：升序

         NSSortDescriptor *decri =[NSSortDescriptor sortDescriptorWithKey:nil ascending:YES];

         //定义一个数组，用来盛放排序条件

         NSArray *des =[NSArray arrayWithObject:decri];

         //开始排序

         [arr1 sortUsingDescriptors:des];

         //打印排序内容

         for (int i=; i<arr1.count; i++)

         {

             NSLog(@"arr=%@",[arr1 objectAtIndex:i]);

         }

    NSMutableArray *arr2=[NSMutableArray arrayWithObjects:@"c", @"A",@"z",@"D",nil];

         //区分大小写排序 自带compar方法  选择排序

         [arr2 sortUsingSelector:@selector(compare:)];

         for (int i=; i<arr2.count; i++)

         {

             NSLog(@"arr2=%@",[arr2 objectAtIndex:i]);

         }

 //创建5个排序对象

     NSDictionary *dic1 =@{@"price":@"",@"name":@"liu"};

     NSDictionary *dic2 =@{@"price":@"",@"name":@"huang"};

     NSDictionary *dic3 =@{@"price":@"",@"name":@"yoyu"};

     NSDictionary *dic4 =@{@"price":@"",@"name":@"yofu"};

     NSDictionary *dic5 =@{@"price":@"",@"name":@"yosu"};

     //将这些对象放进数组

     NSArray *arr =[NSArray arrayWithObjects:dic1,dic2,dic3,dic4, dic5,nil];

     //调用数组排序方法

     NSArray *arr2 = [arr sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2)

     {

         //取出对象里的一个值作比较，根据大小返回结果

         NSString  *c = [obj1 valueForKey:@"price"];

         NSString  *d = [obj2 valueForKey:@"price"];

         int a =[c intValue]; //转成整形int比较

         int b =[d intValue];

         //按照降序排列，如果升序就返回结果对换

         if (a > b)

         {

             return NSOrderedAscending;

         }else

         {

             return NSOrderedDescending;

         }

     }];

     //循环遍历排序后的字典数组

     for (NSDictionary *dic in arr2)

     {

          NSLog(@"%@",dic);

     }