ios - 重用导航栏按钮

Question

在我的项目中，我有一个带有三个嵌入式 UIViewController 的 UINavigationController。在第一个上，我将 balanceLabel 和 refreshButton 添加到导航栏。当点击按钮时，首先 View Controller 发送 url 请求并在标签上显示返回值。

@IBAction func refreshButtonAction(_ sender: UIBarButtonItem) {

let operation = GetInfoOperation(...)

operation.completionBlock = { [weak self] in

  DispatchQueue.main.async {

    guard let balance = operation.output?.value?.balance else { return }
    self?.balanceLabel.text = balance
    let significantDigits = Int(Double(balance.toInt64!) * pow(10, -10))

  }
}
queue.addOperation(operation)

如果每个 ViewController 中没有重复的 @IBAction func refreshButtonAction(_ sender: UIBarButtonItem)，我如何才能在其他 ViewController 上获得相同的行为？

Answer 1

您可以通过扩展、使用继承来归档它，

使用所有你想要的通用功能创建你想要的 View Controller ，然后不是直接从 UIViewController 继承，而是从那个基础 viewController 继承

你的基础 Controller BaseViewController

class BaseViewController: UIViewController {
   //all comman functionallity 
   //add your button here 
}

class ChildOneViewController: BaseViewController {
   //this class will get all the functionality from BaseViewController
   //you can access the BaseViewController button here
   //add function for ChildOneViewController
}

 class ChildtwoViewController: BaseViewController {
   //this class will get all the functionality from BaseViewController
   //you can access the BaseViewController button here
   //add function for ChildtwoViewController
}