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- (void)viewDidLoad {
    [super viewDidLoad];

    self.title = @"???bug?->";
    self.navigationController.navigationBar.barTintColor = [UIColor colorWithRed:68/255.0 green:155/255.0 blue:235/255.0 alpha:1.0];
    self.navigationController.navigationBar.titleTextAttributes = @{NSForegroundColorAttributeName:[UIColor whiteColor]};

    UIBarButtonItem *rightItem0 = [[UIBarButtonItem alloc] initWithTitle:@"????" style:UIBarButtonItemStylePlain target:self action:@selector(recordButtonClick)];
    [rightItem0 setTintColor:[UIColor whiteColor]];

    self.navigationItem.rightBarButtonItems = @[rightItem0];
}

- (void)recordButtonClick{
    [self.navigationController pushViewController:[NextViewController new] animated:YES];
}

右上角的UIBarButtonItem始终突出显示:

为什么右上角的UIBarButtonItem"我会变灰"总是突出显示？这是iOS 11.2中的错误吗？