Swift中不同视图控制器的不同UIKeyCommand数组

Question

我和斯威夫特的UIKeyCommand有点问题。我有两个UIViewVontroller，ProjectsViewController和ViewController。我使用以下代码从ProjectsViewController打开ViewController：

let editor = self.storyboard?.instantiateViewController(withIdentifier: "editor")
self.present(editor!, animated: true, completion: nil)

在我的ProjectsViewController类中，我有一些UIKeyCommands

override var keyCommands: [UIKeyCommand]?
{
  if #available(iOS 9.0, *)
  {
    return [
      UIKeyCommand(input: "n", modifierFlags: .command, action: #selector(projectWizard), discoverabilityTitle: "Create new project"), UIKeyCommand(input: "t", modifierFlags: .command, action: #selector(toolsAction), discoverabilityTitle: "Open Tools"), UIKeyCommand(input: ",", modifierFlags: .command, action: #selector(settingsAction), discoverabilityTitle: "Open Settings"), UIKeyCommand(input: "i", modifierFlags: .command, action: #selector(aboutAction), discoverabilityTitle: "About")
    ]
  }
  else
  {
    return nil
  }
}

在ViewController中，我有另一个：

override var keyCommands: [UIKeyCommand]?
{
  if #available(iOS 9.0, *)
  {
    return [
      UIKeyCommand(input: "n", modifierFlags: .command, action: #selector(addFileAction), discoverabilityTitle: "New file"), UIKeyCommand(input: "r", modifierFlags: .command, action: #selector(runProject), discoverabilityTitle: "Build and run"), UIKeyCommand(input: "w", modifierFlags: .command, action: #selector(closeProject), discoverabilityTitle: "Close window")
    ]
  }
  else
  {
    return nil
  }
}

当我的应用程序显示ProjectsViewController时，我在iPad上按了cmd for Discoverability，它显示了ProjectsViewController的组合，但在我打开ViewController并按cmd后，Discoverability显示了ProjectsViewController和ViewController的组合。如何为每个班级分别使用键盘快捷键？感谢您的关注。

Answer 1

好吧，我找到了一个解决方案，也许它不是最好的，但我可以肯定它工作正常。

在第一个和第二个视图上，定义一个工厂函数来创建所需的所有命令，如下所示

viewController1 {

func shortCutKeys() -> [UIKeyCommand] {
        return [
            UIKeyCommand(input: "1", modifierFlags: [], action: #selector(keyInput)),
           ...
            UIKeyCommand(input: "\u{8}", modifierFlags: [], action: #selector(deleteNumber(_:))),
        ]
    }

}

viewController2 {

func shortCutKeys() -> [UIKeyCommand] {
        return [
            UIKeyCommand(input: "1", modifierFlags: [], action: #selector(keyInput)),
           ...
            UIKeyCommand(input: "\u{8}", modifierFlags: [], action: #selector(deleteNumber(_:))),
        ]
    }

}

在viewDidAppear做这样的事情

 self.shortCutKeys().forEach({
            self.addKeyCommand($0)
        })

在viewDidDisappear

self.shortCutKeys().forEach({
            self.removeKeyCommand($0)
        })