[英]Modify the More button on the Navigation bar of a tab displayed from a UITabBarController's More tab
I have an app with a UITabBarController that has more than five tabs. 我有一个带有UITabBarController的应用程序,该应用程序具有五个以上的选项卡。
When I press the More tab, I go to the moreNavigationController which is a UINavigationController . 当我按“ 更多”选项卡时,我转到moreNavigationController ,它是一个UINavigationController 。
As you can see, I have figured out how to style the Title , Tint , Table color , and the Edit button on the More screen, as well as the Configure screen from pressing the Edit button. 正如你所看到的,我已经找到了如何风格的标题 , 色调 , 表色 ,和更多屏幕上的编辑按钮,以及从按下Edit按钮配置屏幕。
What I have not been able to figure out is how to style the back button, titled More , when I select an item in the table. 当我在表格中选择一个项目时,我还无法弄清如何设置后退按钮的样式,该标题为“ 更多 ”。
Each tab has it's own class, GRWTabSettingsViewController for example, which inherits from GRWViewController , which provides common functionality for all tabs, which then inherits from UIViewController . 每个选项卡都有其自己的类,例如GRWTabSettingsViewController , 该类继承自GRWViewController ,后者为所有选项卡提供通用功能,然后继承自UIViewController 。
When on the Settings screen (or any other tab), I am trying to edit the More back button. 在“ 设置”屏幕(或任何其他标签)上时,我正在尝试编辑“ 更多后退”按钮。
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[(UIBarButtonItem *)[(UINavigationItem *)[(UINavigationBar *)[(UINavigationController *)[self navigationController] navigationBar] topItem] leftBarButtonItem] setTintColor:[UIColor darkGrayColor]];
[self.navigationController.navigationBar.topItem.leftBarButtonItem setTintColor:[UIColor darkGrayColor]];
}
However, this navigationController is clearly the parent since these changes get applied to the More screen and not the Settings screen. 但是,此NavigationController显然是父级,因为这些更改将应用于“ 更多”屏幕,而不是“ 设置”屏幕。
What am I misunderstanding and how would I modify the buttons displayed on the navigation bar of the screen I am viewing? 我有什么误解,如何修改正在查看的屏幕的导航栏上显示的按钮?
=== SOLUTION === ===解决方案===
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
// use backBarButtonItem not leftBarButtonItem
//[(UIBarButtonItem *)[(UINavigationItem *)[(UINavigationBar *)[(UINavigationController *)[self navigationController] navigationBar] topItem] leftBarButtonItem] setTintColor:[UIColor darkGrayColor]];
//[self.navigationController.navigationBar.topItem.leftBarButtonItem setTintColor:[UIColor darkGrayColor]];
UIBarButtonItem *backButton = [[UIBarButtonItem alloc]
initWithTitle:self.navigationController.navigationBar.topItem.title
style:UIBarButtonItemStylePlain
target:nil
action:nil];
[backButton setTintColor:[UIColor darkGrayColor]];
self.navigationController.navigationBar.topItem.backBarButtonItem = backButton;
// these do not work
//[self.navigationController.navigationBar.topItem.backBarButtonItem setTintColor:[UIColor darkGrayColor]];
//[backButton setTintColor:[UIColor darkGrayColor]];
}
Did take me a while to figure out that I can not format the button through self , or format the button after the assignment to self . 确实花了我一段时间才能弄清楚我无法通过self格式化按钮,也无法在分配给self之后格式化按钮。
你应该定制backBarButtonItem
以前的导航项目的,不是的topItem
。
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