iPhone：無法從警報視圖啓動Facebook對話框

Question

未從警報視圖處理程序啓動Facebook對話框。 但Facebook對話框從按鈕啓動確定。

推出的Facebook對話的代碼是繼

- (void) share_on_facebook 
{ 
    _facebook = [[Facebook alloc] initWithAppId:kAppId]; 
    SBJSON *jsonWriter = [[SBJSON new] autorelease]; 
    NSDictionary* actionLinks = [NSArray arrayWithObjects:[NSDictionary dictionaryWithObjectsAndKeys: 
                  @"Always Running",@"text",@"http://itsti.me/",@"href", nil], nil]; 
    NSString *actionLinksStr = [jsonWriter stringWithObject:actionLinks]; 
    NSDictionary* attachment = [NSDictionary dictionaryWithObjectsAndKeys: 
           @"a long run", @"name", 
           @"The Facebook Running app", @"caption", 
           @"it is fun", @"description", 
           @"http://itsti.me/", @"href", nil]; 
    NSString *attachmentStr = [jsonWriter stringWithObject:attachment]; 
    NSMutableDictionary* params = [NSMutableDictionary dictionaryWithObjectsAndKeys: 
            @"Share on Facebook", @"user_message_prompt", 
            actionLinksStr, @"action_links", 
            attachmentStr, @"attachment", 
            nil]; 
    [_facebook dialog:@"feed" andParams:params andDelegate:self]; 
} 

警報視圖的處理程序是按鈕點擊

- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex 
{ 
    [self share_on_facebook]; 
} 

未啓動Facebook的對話框，但是當我打電話從普通的按鈕單擊處理程序share_on_facebook該對話框將成功打開。

請幫忙解決問題。

Answer 1

[self performSelectorOnMainThread：@selector（share_on_facebook）];應該做的竅門