撤消IBAction？

Question

我正在尝试按下UIBarButtonItem并执行一个操作，它确实是这样做的。当发生这种情况时，我会更改BarButtonItem标题的名称。这样，如果我再次点击它，我想撤消它执行的操作，而不是编写所有代码来更改它。下面是我的代码示例。

- (IBAction)MyAction:(id)sender{

if([[MyButton title] isEqualToString:@"Test1"]){

//My Action is performed.

    [MyButton  setTitle:@"Test2"];
    [[undoManager prepareWithInvocationTarget:self] MyAction:?];
    [undoManager setActionName:@"UndoLastAction"];


}else if ([[MyButton title] isEqualToString:@"Test2"]){

    [MyButton setTitle:@"Test1"];
    [[undoManager prepareWithInvocationTarget:self]MyAction:?];
    [undoManager setActionName:@"UndoLastAction"];
}

}

Answer 1

不要紧，只需重新运行原始代码来“撤消”操作就更容易了。

Answer 2

如果你想试试的话。

以编程方式在viewDidLoad.，，中添加UIButton。

 - (void)viewDidLoad
{
MyButton =[UIButton buttonWithType:UIButtonTypeRoundedRect];
[MyButton setFrame:CGRectMake(300, 450, 72, 37)];
[MyButton setTitle:@"Test1" forState:UIControlStateNormal]; 
[MyButton addTarget:self action:@selector(MyAction:) forControlEvents:UIControlEventTouchUpInside];
[self.view MyButton];

}

然后给出这样的动作……

 -(IBAction)MyAction:(id)sender
 { 
   UIButton *temp=(UIButton *)sender;

    if(temp.titleLabel.text==@"Test1")
    {
       [temp setTitle:@"Test2" forState:UIControlStateNormal]; 

    }
    else if (temp.titleLabel.text==@"Test2")
    {
      [temp setTitle:@"Test1" forState:UIControlStateNormal]; 
    }

}

我正在学习，..，..