所有 UI 导航栏标题的大写字符串

Posted 2023-03-13

【中文标题】所有 UI 导航栏标题的大写字符串

【英文标题】：Uppercase string for all UINavigation bar titles

【发布时间】：2014-12-30 22:11:12

【问题描述】：

目前，我正在使用AppDelegate 中的以下内容更改导航栏的字体：

[[UINavigationBar appearance] setTitleTextAttributes:
 [NSDictionary dictionaryWithObjectsAndKeys:
  [UIFont fontWithName:@"..." size:...], NSFontAttributeName,
  nil]];

有没有办法确保字符串全局大写？

【问题讨论】：

似乎不可能，尽管这是相关的：***.com/a/6727489

【参考方案1】：

使用 NSAttributedString 无法实现这一点，但您可以在基本视图控制器类中更改标题。 试试这个：

/// Base class for all view controllers
class BaseViewController: UIViewController 

    private var firstWillAppearOccured = false

    override func viewWillAppear(_ animated: Bool) 
        super.viewWillAppear(animated)
        if !firstWillAppearOccured 
            viewWillFirstAppear(animated)
            firstWillAppearOccured = true
        
    

    /// Method is called when `viewWillAppear(_:)` is called for the first time
    func viewWillFirstAppear(_ animated: Bool) 
        title = title?.uppercased() // Note that title is not available in viewDidLoad()
    

【参考方案2】：

您可以将UINavigationBar appearance 使用的UIFont 配置为使用大写字母。

extension UIFont 

func getAllCapsFont(with size: CGFloat, andWeight weight: Weight) -> UIFont 
    let fontDescriptor = UIFont.systemFont(ofSize: size, weight: weight).fontDescriptor
    
    let upperCaseFeature: [UIFontDescriptor.FeatureKey: Int] = [
        .featureIdentifier: kUpperCaseType,
        .typeIdentifier: kUpperCaseSmallCapsSelector
     ]

    let lowerCaseFeature: [UIFontDescriptor.FeatureKey: Int] = [
        .featureIdentifier: kLowerCaseType,
        .typeIdentifier: kLowerCaseSmallCapsSelector
    ]

    let features = [upperCaseFeature, lowerCaseFeature]
    let additions = fontDescriptor.addingAttributes([.featureSettings: features])
    return UIFont(descriptor: additions, size: size)

【讨论】：

这些是小型大写字母。有机会使用普通大写吗？

【参考方案3】：

您可以创建一个基础UIViewController 隐藏原来的导航栏并自己添加一个新的。

self.navigationController.navigationBarHidden = YES;

UINavigationBar *navigationBar = [[UINavigationBar alloc] initWithFrame:frame];
UINavigationItem *naviItem = [[UINavigationItem alloc] init];
self.titleLabel = [UILabel new];
naviItem.titleView = self.titleLabel;
navigationBar.items = [NSArray arrayWithObjects:naviItem, nil];
[self.view addSubview:navigationBar];

然后就可以控制titleLabel的title的设置了。