swift – 使用#selector传递参数

我是 Swift的初学者,我正试图通过NotificationCenter启动一个功能. ‘ViewController.swift’中的观察者调用函数重载：

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)
}

…具有类Ítem的参数：

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

通知从“menu.swift”发布：

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])
    }

如何将’menu.swift’中的对象项[indexPath.row]的值分配给’ViewController.swift’中函数reload的参数？

解决方法

如果要在注册到NotificationCenter的类周围传递对象,则应将其放入传递给observer函数的通知对象的 .userInfo字典中：

NotificationCenter.default.addobserver(self,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)
  }
}