swift - Swift 中不同 View Controller 的不同 UIKeyCommand 数组

Question

我在 Swift 中遇到 UIKeyCommand 问题。我有两个 UIViewVontroller、ProjectsViewController 和 ViewController。我正在使用以下代码从 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 中还有一个:

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，我在我的 iPad 上按了 cmd 以进行可发现性，它显示了 ProjectsViewController 的组合，但是在我打开 之后ViewController 并按 cmd，Discoverability 会显示 ProjectsViewController 和 ViewController 的组合。如何为每个类(class)分开键盘快捷键？感谢您的关注。

Answer 1

好的，我找到了一个解决方案，也许它不是最好的，但我可以确定它可以正常工作。

在第一个和第二个 View 中，定义一个工厂函数来创建你需要的所有命令

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 做类似的事情

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

在 viewDidDisappear 处

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