Facebook API“协议中的方法未实现”

Question

我在我的AppDelegate里做了

@interface AppDelegate : UIResponder <UIApplicationDelegate, FBSessionDelegate> {
Facebook *facebook;
}

并遵循了Facebook开发人员的教程。但它仍然在做四倍的事情，比如：

1)此处声明的方法(Facebook.h)：

- (void)fbDidNotLogin:(BOOL)cancelled;

2)直接或间接协议"FBSessionDelegate“(AppDelegate.h)必填：

@interface AppDelegate : UIResponder <UIApplicationDelegate, FBSessionDelegate> {
Facebook *facebook;
}

我是不是忘了什么？

谢谢!

Answer 1

正如您的AppDelegate声明的那样，要遵循FBSessionDelegate协议，它需要实现该协议所需的所有方法。

因此您需要在AppDelegate.m中实现fbDidNotLogin方法，如下所示

- (void)fbDidNotLogin:(BOOL)cancelled {
    // Do something here
}

Answer 2

根据Hackbook示例，您必须添加更多方法：

- (void)storeAuthData:(NSString *)accessToken expiresAt:(NSDate *)expiresAt {
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    [defaults setObject:accessToken forKey:@"FBAccessTokenKey"];
    [defaults setObject:expiresAt forKey:@"FBExpirationDateKey"];
    [defaults synchronize];}

    -(void)fbDidNotLogin:(BOOL)cancelled{
    }

    -(void)fbDidExtendToken:(NSString *)accessToken expiresAt:(NSDate *)expiresAt{

    NSLog(@"token extended");
    [self storeAuthData:accessToken expiresAt:expiresAt];
}

- (void)fbSessionInvalidated {
    UIAlertView *alertView = [[UIAlertView alloc]
                              initWithTitle:@"Auth Exception"
                              message:@"Your session has expired."
                              delegate:nil
                              cancelButtonTitle:@"OK"
                              otherButtonTitles:nil,
                              nil];
    [alertView show];
    [alertView release];
    [self fbDidLogout];
}