让leftbarbuttonitem右移。

用**leftBarButtonItem**，但是我想让它移动的更往右点，它现在贴在左边的位置。有什么解决办法吗？

这是Button的按钮：

[UIButton buttonWithType:UIButtonTypeCustom];
    [button setBackgroundImage:[UIImage imageNamed:@"task_status.png"] forState:UIControlStateNormal];
    [button addTarget:self action:@selector(changeStatus:) forControlEvents:UIControlEventTouchUpInside];
    [button setFrame:CGRectMake(80, 0,100, 18)];
    self.tabBarController.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:button];

多谢

            UIBarButtonItem *flexBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target: action:]
            UIBarButtonItem *flexBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:<#(id)#> action:<#(SEL)#>]

试试看，记得是用 下面类型的 barbuttonItem