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我使用FBConnect API ...而我使用此代碼，同時按下鍵..白黑屏
- (IBAction)postGradesTapped:(id)sender {
_posting = YES;
// If we're not logged in, log in first...
if (![_session isConnected]) {
self.loginDialog = nil;
_loginDialog = [[FBLoginDialog alloc] init];
[_loginDialog show];
}
// If we have a session and a name, post to the wall!
else if (_facebookName != nil) {
[self postToWall];
}
// Otherwise, we don't have a name yet, just wait for that to come through.
}
現在，當我按下按鈕...
白色空白屏幕出現... :(
可以採取什麼問題？