更改后导航栏按钮的字体

Question

我希望能够设置我的应用程序导航栏后退按钮的字体，而不会做任何太疯狂的事情，并且不会丢失按钮的任何其他设计特征（即我想保留箭头）。

现在我在viewDidAppear:使用它viewDidAppear:设置普通条形按钮项的字体。

for (NSObject *view in self.navigationController.navigationBar.subviews) {
    if ([view isKindOfClass:[UIButton class]]) {
        [((UIButton*)view).titleLabel setFont:[UIFont 
                                 fontWithName:@"Gill Sans" 
                                         size:14.0]];
    }
}

但是，这不会对后退按钮进行任何更改，无论该代码应用于哪个UIViewController （root，current等）。

Answer 1

要更改所有UINavigationBars出现的所有UIBarButtonItems本的外观，请在application:didFinishLaunchingWithOptions:执行以下操作application:didFinishLaunchingWithOptions:

[[UIBarButtonItem appearanceWhenContainedIn:[UINavigationBar class], nil] setTitleTextAttributes:
    @{UITextAttributeTextColor:[UIColor blackColor],
     UITextAttributeTextShadowOffset:[NSValue valueWithUIOffset:UIOffsetMake(0, 1)],
     UITextAttributeTextShadowColor:[UIColor whiteColor],
     UITextAttributeFont:[UIFont boldSystemFontOfSize:12.0]
    }
     forState:UIControlStateNormal];

更新：iOS7友好版

NSShadow *shadow = [[NSShadow alloc] init];
shadow.shadowOffset = CGSizeMake(0.0, 1.0);
shadow.shadowColor = [UIColor whiteColor];

[[UIBarButtonItem appearanceWhenContainedIn:[UINavigationBar class], nil]
 setTitleTextAttributes:
 @{NSForegroundColorAttributeName:[UIColor blackColor],
   NSShadowAttributeName:shadow,
   NSFontAttributeName:[UIFont boldSystemFontOfSize:12.0]
   }
 forState:UIControlStateNormal];

迅速：

注意：这会更改UIBarButtonItem所有实例，而不仅仅是UINavigationBar包含的实例

UIBarButtonItem.appearance()
               .setTitleTextAttributes([NSFontAttributeName : ExamplesDefaults.fontWithSize(22)], 
                                       forState: UIControlState.Normal)

Swift3：

UIBarButtonItem.appearance()
     .setTitleTextAttributes([NSFontAttributeName: UIFont(name: "FontName-Regular", size: 14.0)!], 
                             for: .normal) 

Answer 2

对于那些没有完全解决这个问题的人来说，我就是这样做的，包括弹回到IOS7中的Root ViewController：

UIBarButtonItem *backBtn =[[UIBarButtonItem alloc]initWithTitle:@"Back" style:UIBarButtonItemStyleDone target:self action:@selector(popToRoot:)];
backBtn.title = @"Back";
[backBtn setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
                                 [UIFont fontWithName:@"Chalkduster" size:15], NSFontAttributeName,
                                 [UIColor yellowColor], NSForegroundColorAttributeName,
                                 nil]
                       forState:UIControlStateNormal];

self.navigationItem.leftBarButtonItem=backBtn;

popToRoot ViewController：

- (IBAction)popToRoot:(UIBarButtonItem*)sender {
[self.navigationController popToRootViewControllerAnimated:YES];
}

也许有人可能会使用这个。

Answer 3

上面提到的Swift版本（摘自原始答案 ）：

let customFont = UIFont(name: "customFontName", size: 17.0)!
UIBarButtonItem.appearance().setTitleTextAttributes([NSFontAttributeName: customFont], forState: .normal)

更多好东西：
https://stackoverflow.com/a/28347428/469614

Answer 4

在Swift3中：

let font = UIFont(name: "Verdana", size: 10.0)

// Back button
UIBarButtonItem.appearance().setTitleTextAttributes([NSFontAttributeName: font!], for: UIControlState.normal)  

// Title in the navigation item
let fontAttributes = [NSFontAttributeName: font]
self.navigationController?.navigationBar.titleTextAttributes = fontAttributes

注意：您只需为导航控制器执行一次此操作。

Answer 5

Swift 3.0+

AppDelegate.swift

UIBarButtonItem.appearance().setTitleTextAttributes([NSAttributedStringKey.font: UIFont(name: "myFont", size: 17.0)!], for: .normal)

Answer 6

请在AppDelegate或初始化NavigationController的地方使用此方法，该方法在iOS 5及更高版本中可用

UIBarButtonItem *backbutton =  [[UIBarButtonItem alloc] initWithTitle:@"back" style:UIBarButtonItemStyleBordered target:nil action:nil];  
[backbutton setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
                                                   [UIColor blackColor],UITextAttributeTextColor,[UIFont fontWithName:TEXTFONT size:16.0f],UITextAttributeFont,
                                                   nil] forState:UIControlStateNormal]; 

Answer 7

如果您在iOS 8中使用新的UISplitViewControllerDelegate进行拆分视图，则上述方法将无法工作，因为新的displayModeButtonItem工作方式略有不同。

您需要在创建displayModeButtonItem时设置字体。 假设您正在关注Apple的模板，这可能是在prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender ，您可以在此处执行以下操作：

// From Apple's Template:
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
NSManagedObject *object = [[self fetchedResultsController] objectAtIndexPath:indexPath];
DetailViewController *controller = (DetailViewController *)[[segue destinationViewController] topViewController];
[controller setDetailItem:object];
controller.navigationItem.leftBarButtonItem = self.splitViewController.displayModeButtonItem;
controller.navigationItem.leftItemsSupplementBackButton = YES;
// New Line to set the font:
[controller.navigationItem.leftBarButtonItem setTitleTextAttributes:@{NSFontAttributeName : [UIFont fontWithName:@"SourceSansPro-Regular" size:14]} forState:UIControlStateNormal];