Question

I have created a unbutton programatically and made an action

{
UIButton *myButton1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    myButton1.frame = CGRectMake(20, 20, 80, 44); 
    [myButton1 setTitle:@"Click Me!" forState:UIControlStateNormal];
    [myButton1 addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:myButton1];
}

和在《国际反种族歧视公约》中,我有《国际反种族歧视公约》的一般性意见。

- (IBAction)buttonClicked:(id)sender 
{
    CGRect myFrame = CGRectMake(0, 300, 100, 50);
    UIView *myView = [[UIView alloc] initWithFrame:myFrame];
    myView.backgroundColor = [UIColor lightGrayColor];
    [self.view addSubview:myView];
    [myView release];
}

现在想要的是,当用户第二次报道我的Button1时,必须消失。如何做到这一点?

Answer 1

www.un.org/Depts/DGACM/index_spanish.htm 对我们的法典作一些修改——。

**Action like this -** 

- (IBAction)buttonClicked:(id)sender 
 {
   UIView *myView;
   if([self.view viewWithTag:56])
   {
    [[self.view viewWithTag:56] removeFromSuperview];
  }
  else
  {
   CGRect myFrame = CGRectMake(0, 300, 100, 50);
   myView = [[UIView alloc] initWithFrame:myFrame];
   myView.backgroundColor = [UIColor lightGrayColor];
  [myView setTag:56];
  [self.view addSubview:myView];
  [myView release];
   }
}

Answer 2

you can use [view removeFromSuperView] method to remove a view.

Answer 3

更改<代码>buttonClicked:方法。

- (void)buttonClicked:(id)sender 
{
UIView *myView;
if(myView=[self.view viewWithTag:1234])
{
    [myView removeFromSuperview];
}
else {
    CGRect myFrame = CGRectMake(0, 300, 100, 50);
    myView= [[UIView alloc] initWithFrame:myFrame];
    [myView setTag:1234];
    myView.backgroundColor = [UIColor lightGrayColor];
    [self.view addSubview:myView];
    [myView release];
}
[self.view setNeedsDisplay];
}

EDIT: It doesn t read well if you use IBAction and not use the Interface Builder.

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