如何通過一個按鈕來消失的UIView點擊

Question

我創建了一個解開編程和做動作

{ 
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爲我有一個UIView作爲這樣

- (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]; 
} 

我現在想子視圖當用戶第二次按myButton1時子視圖必須消失。我怎樣才能做到這一點？

Answer 1

做一些修正在我們的代碼 -

**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]方法刪除視圖。

Answer 3

將您的buttonClicked:方法更改爲此。

- (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]; 
} 

編輯：如果您使用IBAction並且不使用界面生成器它不讀好。