如何通过一个按钮来消失的UIView点击

Question

我创建了一个解开编程和做动作

{ 
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IBAction为我有一个UIView作为这样

- (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]; 
} 

我现在想子视图当用户第二次按myButton1时子视图必须消失。我怎样才能做到这一点？

Answer 1

做一些修正在我们的代码 -

**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

您可以使用[view removeFromSuperView]方法删除视图。

Answer 3

将您的buttonClicked:方法更改为此。

- (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]; 
} 

编辑：如果您使用IBAction并且不使用界面生成器它不读好。