利用通知センター:
extension Notification.Name {
static var RequestCompleted = Notification.Name(rawValue: "MyRequestIsCompleted")
static var RequestError = Notification.Name(rawValue: "MyRequestError")
}
class DataRequest {
func request() {
// if there is error:
let error = NSError(domain: "Error Sample", code: 0, userInfo: nil)
NotificationCenter.default.post(name: .RequestError, object: error)
// if the request is completed
let data = "your data is here"
NotificationCenter.default.post(name: .RequestCompleted, object: data)
}
}
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(requestCompleted(_:)), name: .RequestCompleted, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(requestError(_:)), name: .RequestError, object: nil)
}
deinit {
NotificationCenter.default.removeObserver(self)
}
func requestCompleted(_ notification: Notification) {
if let obj = notification.object {
print(obj)
}
}
func requestError(_ notification: Notification) {
if let obj = notification.object {
print(obj)
}
}
}
使用NSNotificatioCenterあなたのデータの準備ができているときがある場合、(例えば「ErrorOccurs」と呼ばれる)別の通知を(「DataIsReady」と呼ばれる)の通知を投稿しますエラーが発生すると、すべてのView Controllerが通知を監視して処理します。 – bubuxu