Question

i 奥贝吉斯·塞特是新的,因此,如果这是一个简单的问题,请原谅我。 i 试图从Facebook IOS整合辅导处获得以下代码,但一线有误。

- (void) logoutButtonClicked:(id)sender {
    [facebook logout];

我发现错误。

“使用未申报的识别标志”标志 ButtonClicked. 我知道,这就是说,我正在执行一种没有界定的方法。因此,我的问题是,下面的法典中正在界定哪些方法?

i have seen a solution here posted but it does not work for me, this error persists. I have tried alternatives to try and fix, but could some one please confirm what this block of code is doing.

My understanding is that, we start of creating a pointer (logoutButton) to UIButton, and we then set the parameters of it. We then use a selector to define an action message (LogoutButtonClicked), for the method UIControlEventTouchInside.

我并不完全理解如何宣布这一方法,因为我认为这里的行文是界定理由方法的:

-(void) logoutButtonClicked:(id)sender {
        [facebook logout];

或者,正在宣布的方法

[logoutButton addTarget:self action:@selector(logoutButtonClicked)
           forControlEvents:UIControlEventTouchUpInside];

// Add the logout button
    UIButton *logoutButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    logoutButton.frame = CGRectMake(40, 40, 200, 40);
    [logoutButton setTitle:@"Log Out" forState:UIControlStateNormal];
    [logoutButton addTarget:self action:@selector(logoutButtonClicked)
           forControlEvents:UIControlEventTouchUpInside];
    [self.viewController.view addSubview:logoutButton];
    // Method that gets called when the logout button is pressed
    - (void) logoutButtonClicked:(id)sender {
        [facebook logout];
    }

我真的会赞赏有人在这样做时提供帮助,他们一直在努力理解这一点。

Melvin

Answer 1

The colon is part of the selectedor s name:

@selector(logoutButtonClicked:)
                             ^

<>0>

@selector(logoutButtonClicked)

Answer 2

在另一种方法中,你似乎正在界定一种正确的方法。你可以这样做。内容如下:

- (void) logoutButtonClicked:(id)sender {
    [facebook logout];
}

不必在任何其他方法之外出现({<>>>>/code>......>>><>>>>>>。

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