ios - 在 guard 语句 swift 中呈现一个 ViewController

Question

我正在尝试呈现 viewcontroller，以防状态(Int？)为零，如下所示:

    guard let statusCode = status else {
        DispatchQueue.main.async() {
            let initViewController = self.storyboard!.instantiateViewController(withIdentifier: "SignInViewController")
            self.present(initViewController, animated: false, completion: nil)
        }
            return
    }

我想知道这是否是最佳实践，因为在呈现 View Controller 后返回没有多大意义，但在 guard 语句中它是必需的 guard声明不能落空。

Answer 1

回答关于guard 语句和return 关键字的问题

func yourFunc() {
    guard let statusCode = status else {
      return DispatchQueue.main.async() { [weak self] _ in
        let initViewController = self?.storyboard!.instantiateViewController(withIdentifier: "SignInViewController")
        self?.present(initViewController!, animated: false, completion: nil)
    }
  }
}