iPhone：是否可以隱藏和取消隱藏UIACtionSheet按鈕？

Question

我在我的應用程序中使用FBConnect。登錄操作表按鈕是標題「登錄Facebook」和「登出Facebook」，但我想顯示「登錄Facebook」和「發佈到Facebook」。目前，它看起來像這樣...

alt text http://freezpic.com/pics/6944f45f17ba4bbb8220637d5a00a1c6.jpg

...但我希望它看起來像這樣...

alt text http://www.freezpic.com/pics/93f28f4f9103f0842c849d7daa644f81.jpg

...可能在這些方法中設置：

- (void)session:(FBSession*)session didLogin:(FBUID)uid { 

    //Show button log out 

} 

- (void)sessionDidLogout:(FBSession*)session { 

    //show button log in 
} 

從答案評論Edit01-警報表代碼：

-(IBAction)mySheet:(id)sender { 
    UIActionSheet *menu = [[UIActionSheet alloc] initWithTitle:@"FaceBook" 
                 delegate:self 
              cancelButtonTitle:@"Cancel" 
             destructiveButtonTitle:nil 
              otherButtonTitles:@"Share On the Facebook" , 
                   @"Log in Facebook" , 
                   @"LogOut Facebook" ,nil]; 
    [menu showInView:self.view]; 
    [menu release]; 
} 

Answer 1

最後我實現了！ (alreadyLoggedInToFacebook)必須是(season.isConnect)。一切都很好 ！但仍然是一個問題。登錄後 - 註銷和共享顯示偉大但沒有很好的工作！這意味着如果用戶點擊註銷按鈕，登錄窗口再次出現！爲什麼？我認爲，因爲FBLoginButton，當刪除此方法我的UIActionSheet不顯示

！這裏是我的代碼：

-(IBAction)mySheet:(id)sender 
{ 
    if (session.isConnected) { 
     UIActionSheet *menu = [[UIActionSheet alloc] initWithTitle:@"FaceBook" 
                  delegate:self cancelButtonTitle:@"Cancel" 
              destructiveButtonTitle:nil 
               otherButtonTitles: @"Share On the Facebook" , @"Log out Facebook" ,nil]; 
     [menu showInView:self.view]; 
     [menu release]; 


    } else { 



     UIActionSheet *menu2 = [[UIActionSheet alloc] initWithTitle:@"FaceBook" 
                  delegate:self cancelButtonTitle:@"Cancel" 
              destructiveButtonTitle:nil 
                otherButtonTitles: @"Log in Facebook" , 
           nil]; 

     [menu2 showInView:self.view]; 
     [menu2 release]; 
    } 
} 


- (void)actionSheet:(UIActionSheet *)menu2 didDismissWithButtonIndex:(NSInteger)buttonIndex { 

if (buttonIndex != [menu2 cancelButtonIndex]) 
    { 

     FBLoginDialog* login = [[FBLoginDialog alloc] initWithSession:session]; 
     [login show]; 
     [login release]; 
    } 

} 

- (void)actionSheet:(UIActionSheet *)menu didDismissWithButtonIndex2:(NSInteger)buttonIndex { 



    if (buttonIndex != [menu cancelButtonIndex]) 
    { 
     [session logout]; 
    } 

} 

Answer 2

當然，只是顯示一個不同的UIActionSheet，只有這兩個按鈕取決於Facebook連接的狀態。

什麼：

-(IBAction)mySheet:(id)sender 
{ 
    if (alreadyLoggedInToFacebook) { 
     UIActionSheet *menu = [[UIActionSheet alloc] initWithTitle:@"FaceBook" 
      delegate:self cancelButtonTitle:@"Cancel" 
       destructiveButtonTitle:nil 
        otherButtonTitles: @"Share On the Facebook" , @"Log in Facebook" , 
         @"LogOut Facebook" ,nil]; 
    } else { 
     UIActionSheet *menu = [[UIActionSheet alloc] initWithTitle:@"FaceBook" 
      delegate:self cancelButtonTitle:@"Cancel" 
       destructiveButtonTitle:nil 
        otherButtonTitles: @"LogOut Facebook" ,nil]; 
    } 
    [menu showInView:self.view]; 
    [menu release]; 
}