NSMutableArray 排序

NSMutableArray *array1=[NSMutableArray arrayWithObjects:@"1",@"3",@"2", nil];

//NSLog(@"%@",array1);

/*结果:

(

1,

3,

2 )

*/

NSLog(@"%@",array1);

NSArray *array2= [array1 sortedArrayUsingSelector:@selector(compare:)];//注意 这个方法没有修改array1

NSLog(@"%@",array1);

/*结果:

            (

            1,

                     3,

                     2 )

            */

//NSLog(@"%@",array2);

/*结果:

            (

            1,

2,

3 )

            */

//NSLog(@"%@",array1);

//[array1 sortUsingSelector:@selector(compare:)];//这个方法会修改array1

//NSLog(@"%@",array1);

/*结果:

(

1,

2,

3 )

*/