数组倒序

 //将数组倒序
    NSMutableArray *arr  = [NSMutableArray arrayWithObjects:@"1",@"2",@"3",@"4",@"5", nil];
    NSLog(@"arr = %@",arr);
    
    NSEnumerator *enumer = [arr reverseObjectEnumerator];
    
    arr = [[NSMutableArray alloc]initWithArray:[enumer allObjects]];
    
    NSLog(@"arr2 = %@",arr);