Objective c iphone sdk在UI上隐藏uitextview按钮单击

我对iphonesdk编程还不熟悉，并且已经被困在这个问题上好几天了

我想要一个切换uitextview的按钮。第一次单击显示文本框，第二次单击隐藏文本框，依此类推

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听起来很简单

创建UIButton的实例，并将其目标设置为将切换UITextView实例的隐藏属性的方法。例如，假设您有一个名为discosearingtextview的UITextView实例变量

- (void)loadView
{
    [super loadView];

    // Add the UITextView.
    disappearingTextView = [[UITextView alloc] initWithFrame:CGRectMake(10, 10, 300, 200)];
    [[self view] addSubview:disappearingTextView];

    // Add the button, and add self as target, with toggleTextViewHidden as the action to trigger on TouchUpInside.
    UIButton *toggleTextViewHiddenButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [toggleTextViewHiddenButton setFrame:CGRectMake(10, 220, 300, 44)];
    [toggleTextViewHiddenButton addTarget:self action:@selector(toggleTextViewHidden) forControlEvents:UIControlEventTouchUpInside];
    [[self view] addSubview:toggleTextViewHiddenButton];
}

然后，在toggleTextViewHidden方法中，切换消失文本视图的隐藏属性

- (void)toggleTextViewHidden
{
    [disappearingTextView setHidden:( ! [disappearingTextView isHidden])];
}