使用#selector 传递参数

我是 Swift 的初学者，我正在尝试通过通知中心启动一个功能。 “ViewController.swift”中的观察者调用函数reload:

override func viewDidLoad() {
    super.viewDidLoad()
    NotificationCenter.default.addObserver(self, selector: #selector(reload), name: NSNotification.Name(rawValue: "reload"), object: nil)
}

func reload(target: Item) {
    print(target.name)
    print(target.iconName)
}

...它有一个类参数Ítem:

class Item: NSObject {
    let name: String
    let iconName: String
    init(name: String, iconName: String) {
        self.name = name
        self.iconName = iconName
    }
}

该通知是从“menu.swift”发布的：

class menu: UIView, UITableViewDelegate, UITableViewDataSource {

let items: [Item] = {
    return [Item(name: "Johnny", iconName: "A"), Item(name: "Alexis", iconName: "B"), Item(name: "Steven", iconName: "C")]
}()

...

func tableView(_ tableView: UITableView, didSelectRowAt indexPath:
    NotificationCenter.default.post(name: NSNotification.Name(rawValue: "reload"), object: items[indexPath.row])
    }

如何分配对象的值items[indexPath.row]从'menu.swift'到函数的参数reload在“ViewController.swift”中？

如果您想在注册到的类周围传递对象NotificationCenter，你应该把它放入.userInfo https://developer.apple.com/reference/foundation/nsnotification/1409222-userinfo传递给观察者函数的通知对象的字典：

NotificationCenter.default.addObserver(self, selector: #selector(reload), name: Notification(name: "reload"), object: nil)

--

let userInfo = ["item": items[indexPath.row]]
NotificationCenter.default.post(name: "reload", object: nil, userInfo: userInfo)

--

func reload(_ notification: Notification) {
  if let target = notification.userInfo?["item"] as? Item {
    print(target.name)
    print(target.iconName)
  }
}