UIBarButtonItem - 如何弹出“完成”按钮？

Question

我有一个带有“完成”按钮的导航控制器。当用户完成表单后，按“完成”，我希望该视图从堆栈中弹出并返回主菜单。

这是我到目前为止的代码：

UIBarButtonItem *anotherButton = [[UIBarButtonItem alloc] initWithTitle:@"Done" 
                                                                  style:UIBarButtonItemStylePlain 
                                                                 target:self 
                                                                 action:[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:1] animated:YES]];          
self.navigationItem.rightBarButtonItem = anotherButton;

请帮忙！谢谢

Answer 1

你怎么试试这个：

UIBarButtonItem *anotherButton = [[UIBarButtonItem alloc] initWithTitle:@"Done" 
                                                               style:UIBarButtonItemStylePlain 
                                                                 target:self 
                                                                 action:@selector(onClickOfDone);          
self.navigationItem.rightBarButtonItem = anotherButton;

现在在名为 onClickOfDone

的方法中编写popViewController逻辑

- (void)onClickOfDone {
[self.navigationController popViewControllerAnimated:YES];
}

如果你的弹出只有一个级别，那么上面的代码会有所帮助。如果要指定要将其弹出的控制器，则可以使用

[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:1] animated:YES]

编辑：

您也可以使用SystemItem进行完成：

UIBarButtonItem *aDoneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone 
                                                                             target:self action:@selector(onClickOfDone)];
self.navigationItem.rightBarButtonItem = aDoneButton;
[aDoneButton release];

Answer 2

1）定义与self对应的类的新方法。例如，

- (void)closeView
{
    [self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:1] animated:YES];
}

2）创建按钮时设置适当的选择器：

UIBarButtonItem *anotherButton = [[UIBarButtonItem alloc] initWithTitle:@"Done" 
                                                              style:UIBarButtonItemStylePlain 
                                                             target:self 
                                                             action:@selector(closeView)];          
self.navigationItem.rightBarButtonItem = anotherButton;
[anotherButton release]; // and don't forget to clear memory

Answer 3

您的代码是正确的只需创建一个函数并在该函数内部编写弹出代码，然后使用@selector执行该函数。