iOS导航栏标题不显示（标题颜色设置失效）技术求助

核心问题定位 #

你代码里错误地将标题赋值给了navigationController?.navigationItem，但导航栏实际显示的是当前视图控制器自身navigationItem的标题，而非导航控制器的navigationItem，这是标题不显示的直接原因。

修复步骤 #

1. 修正标题赋值对象
   将：

   navigationController?.navigationItem.title = "Add Personal Finance Log"
   

   修改为：

   navigationItem.title = "Add Personal Finance Log"
   

2. 潜在问题排查（可选）

   • 确认APP_FONT_MAIN对应的字体已正确导入项目，若字体不存在，可临时替换为系统字体测试：UIFont.systemFont(ofSize: 22)
   • 检查hexStringToUIColor方法是否正确返回预期的绿色背景色，避免因背景色与标题色一致导致标题被“隐藏”（此场景概率较低，可作为兜底排查项）

修复后的完整代码片段 #

func configureUI() {
    view.backgroundColor = .white
    
    //configure NavBar
    navigationItem.title = "Add Personal Finance Log"
    navigationController?.navigationBar.isHidden = false
    navigationController?.navigationItem.hidesBackButton = true
    let backButton = UIBarButtonItem(image: UIImage(systemName: "chevron.left")?.withTintColor(.white, renderingMode: .alwaysOriginal), style: .plain, target: self, action: #selector(handleBack))
    navigationItem.leftBarButtonItem = backButton
    let appearance = UINavigationBarAppearance()
    appearance.configureWithOpaqueBackground()
    appearance.backgroundColor = hexStringToUIColor(hex: APP_HEXCOLOR_MAIN)
    let titleAttribute = [NSAttributedString.Key.font: UIFont.init(name: APP_FONT_MAIN, size: 22), NSAttributedString.Key.foregroundColor: UIColor.white]
    appearance.titleTextAttributes = titleAttribute as [NSAttributedString.Key : Any]
    navigationItem.standardAppearance = appearance
    navigationItem.scrollEdgeAppearance = appearance
    navigationItem.compactAppearance = appearance
}

内容的提问来源于stack exchange，提问作者ohu