如何在appdelegate中使用 View Controller 中的函数？在 Swift 4 中。
let viewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "ViewController") as! ViewController
viewController.setapnsText(token: deviceTokenString)
public func setapnsText(token: String) -> Void {
apnsToken.text=token
}
我试过了，但不起作用。
最佳答案
只有当用户拥有/授予您的应用推送通知权限时，您才能在每次启动时接收设备 token 。此外，这通常可以且最容易地在 AppDelegate 中捕获。
因此，在我的示例中，我保存到 UserDefaults(不推荐)和核心数据(更推荐，因为如果您为应用程序启用本地加密，则可以利用本地加密)。
您像这样请求授权，对于一个旨在在 iOS 10 + 上运行并要求在启动时推送通知的应用程序:
class AppDelegate: UIResponder, UIApplicationDelegate {
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
notificationHandler(application)
return true
}
func notificationHandler(_ application: UIApplication) {
if #available(iOS 10.0, *) {
let center = UNUserNotificationCenter.current()
center.getNotificationSettings(){ (settings) in
switch settings.authorizationStatus {
case .authorized:
print("Authorized Push Notifications by User")
self.registerPushNotifications()
case .denied:
print("show user a view explaining why it's better to enable")
self.registerPushNotifications()
case .notDetermined:
self.requestPushNotifications(center: center, { (granted) in
if granted {
self.registerPushNotifications()
return
}
print("User did not grant Remote Notifications Authorizations")
})
}
}
} else {
print("App does not meet minimum OS Requirements")
return
}
}
fileprivate func requestPushNotifications(center: UNUserNotificationCenter,_ result: @escaping(Bool)->Void) {
center.requestAuthorization(options:[.badge, .alert, .sound]) { (granted, error) in
if error != nil {
print("Could not request Authorization for Notifications - Yet is undetermined")
} else {
result(granted)
}
}
}
func registerPushNotifications() {
if #available(iOS 10.0, *) {
UIApplication.shared.registerForRemoteNotifications()
} else {
print("App does not meet base OS requirements")
}
}
func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
let deviceTokenString = deviceToken.reduce("", {$0 + String(format: "%02X", $1)})
UserDefaults.standard.set(deviceTokenString, forKey: "devicetoken")
coreDataManager.saveDeviceToken(deviceTokenString)
}
}
最终，如果您只想在应用程序中的其他时刻请求此操作，则可以扩展 NSObject，因为它是 AppDelegate 和 UIViewController 的父类(super class) (无论如何，它是所有 Controller 类型类的根类。
class AppDelegate: UIResponder, UIApplicationDelegate {
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
notificationHandler(application)
return true
}
func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
let deviceTokenString = deviceToken.reduce("", {$0 + String(format: "%02X", $1)})
UserDefaults.standard.set(deviceTokenString, forKey: "devicetoken")
coreDataManager.saveDeviceToken(deviceTokenString)
}
}
extension NSObject {
func notificationHandler(_ application: UIApplication) {
if #available(iOS 10.0, *) {
let center = UNUserNotificationCenter.current()
center.getNotificationSettings(){ (settings) in
switch settings.authorizationStatus {
case .authorized:
print("Authorized Push Notifications by User")
self.registerPushNotifications()
case .denied:
print("show user a view explaining why it's better to enable")
self.registerPushNotifications()
case .notDetermined:
self.requestPushNotifications(center: center, { (granted) in
if granted {
self.registerPushNotifications()
return
}
print("User did not grant Remote Notifications Authorizations")
})
}
}
} else {
print("App does not meet minimum OS Requirements")
return
}
}
fileprivate func requestPushNotifications(center: UNUserNotificationCenter,_ result: @escaping(Bool)->Void) {
center.requestAuthorization(options:[.badge, .alert, .sound]) { (granted, error) in
if error != nil {
print("Could not request Authorization for Notifications - Yet is undetermined")
} else {
result(granted)
}
}
}
func registerPushNotifications() {
if #available(iOS 10.0, *) {
UIApplication.shared.registerForRemoteNotifications()
} else {
print("App does not meet base OS requirements")
}
}
}
然后您可以在按钮的链接方法中调用它，如下所示:
class SomeController : UIViewController {
override viewDidLoad() {
super.viewDidLoad()
}
func requestNotificationsAuthorization() {
notificationHandler(UIApplication.current)
}
}
关于ios - 如何在应用程序中显示 apns token ？在 swift 4，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/45463543/