无法设置UITabBarController的moreNavigationController的右键

Question

我有一个非常奇怪的问题,我可以设置UITabBarController的moreNavigationController的所有属性,除了rightBarButtonItem属性.我猜这可能是因为与customizableViewControllers属性相关的一些错误禁用了所有正确的栏按钮项.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

Answer 1

好的解决方案是使用moreNavigationController的委托

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

viewController.navigationItem.rightBarButtonItem = doneButton;

}