iphone - 无法设置UITabBarController的moreNavigationController的右键

我遇到一个非常奇怪的问题，我可以设置UITabBarController的moreNavigationController的所有属性(rightBarButtonItem属性除外)。我猜这可能是由于与customizableViewControllers属性相关的一些错误，该属性禁用了所有右栏按钮项。任何想法如何解决？

    UIBarButtonItem *doneButton = [[UIBarButtonItem alloc]
                                   initWithBarButtonSystemItem:UIBarButtonSystemItemDone
                                   target:self
                                   action:@selector(popViewController)];

    self.customizableViewControllers = nil;
    self.moreNavigationController.navigationBar.barStyle = UIBarStyleBlack;
    self.moreNavigationController.topViewController.navigationItem.title = @"test"; //this works
    self.moreNavigationController.topViewController.navigationItem.leftBarButtonItem = doneButton; // this works
    self.moreNavigationController.topViewController.navigationItem.rightBarButtonItem = doneButton; // this doesn't

最佳答案

确定的解决方案是使用moreNavigationController的委托

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *) viewController animated:(BOOL)animated {

viewController.navigationItem.rightBarButtonItem = doneButton;

}