请求用户权限以在 iOS 8 中接收 UILocalNotifications

Question

我已经在 App Delegate 中设置了本地通知使用这个：

- (void)applicationDidEnterBackground:(UIApplication *)application
{
    UILocalNotification *notification = [[UILocalNotification alloc]init];
    [notification setAlertBody:@"Watch the Latest Episode of CCA-TV"];
    [notification setFireDate:[NSDate dateWithTimeIntervalSinceNow:5]];
    [notification setTimeZone:[NSTimeZone defaultTimeZone]];
    [application setScheduledLocalNotifications:[NSArray arrayWithObject:notification]];
}

当我运行应用程序然后退出时，我收到一条错误消息：

2014-06-07 11:14:16.663 CCA-TV[735:149070] 正在尝试安排本地通知 {fire 日期 = 2014 年 6 月 7 日星期六 11:14:21 太平洋夏令时间，时间 zone = America/Los_Angeles (PDT) offset -25200 (Daylight)，重复 间隔 = 0，重复计数 = UILocalNotificationInfiniteRepeatCount， 下一次火灾日期 = 2014 年 6 月 7 日星期六 11:14:21 Pacific Daylight Time, user info = (null)} 有警报但未收到 用户允许显示警报

如何获得显示警报所需的权限？

Answer 1

从 iOS 8 开始，您需要征得用户的许可才能显示来自您的应用的通知，这适用于远程/推送和本地通知。在 Swift 中你可以这样做，

Swift 2.0 更新

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool {
    // Override point for customization after application launch.
    if(UIApplication.instancesRespondToSelector(Selector("registerUserNotificationSettings:")))
    {
        let notificationCategory:UIMutableUserNotificationCategory = UIMutableUserNotificationCategory()
        notificationCategory.identifier = "INVITE_CATEGORY"
        notificationCategory.setActions([replyAction], forContext: UIUserNotificationActionContext.Default)

        //registerting for the notification.
        application.registerUserNotificationSettings(UIUserNotificationSettings(forTypes:[.Sound, .Alert, .Badge], categories: nil))
    }
    else
    {
       //do iOS 7 stuff, which is pretty much nothing for local notifications.
    }
    return true
}

Swift 3.2

if(UIApplication.instancesRespond(to: #selector(UIApplication.registerUserNotificationSettings(_:)))){
     let notificationCategory:UIMutableUserNotificationCategory = UIMutableUserNotificationCategory()
     notificationCategory.identifier = "INVITE_CATEGORY"
     notificationCategory.setActions([replyAction], forContext: UIUserNotificationActionContext.Default)

     //registerting for the notification.
        application.registerUserNotificationSettings(UIUserNotificationSettings(types:[.sound, .alert, .badge], categories: nil))
}
else{
        //do iOS 7 stuff, which is pretty much nothing for local notifications.
    }

Objective C 的语法也很相似。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    if ([UIApplication instancesRespondToSelector:@selector(registerUserNotificationSettings:)]){
        [application registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert|UIUserNotificationTypeBadge|UIUserNotificationTypeSound categories:nil]];
    }
    // Override point for customization after application launch.
    return YES;
}

要检查当前注册的通知类型，您可以使用 UIApplication 类的方法，

- (UIUserNotificationSettings *)currentUserNotificationSettings

因此，如果用户对您的应用说“不”，那么此函数应该返回一个没有任何类型的设置。

我已经写了一个关于这个的教程，你可以看到它here。

Answer 2

**适用于 iOS8+ 的具有三个按钮操作的本地通知

//按钮：我接受了，稍后提醒，跳过**

        let completeAction = UIMutableUserNotificationAction()
        completeAction.identifier = "COMPLETE_TODO"
        completeAction.title = "I TOOK IT"
        completeAction.activationMode = .Background
        completeAction.destructive = true
        completeAction.authenticationRequired = false

        let remindAction = UIMutableUserNotificationAction()
        remindAction.identifier = "REMIND_TODO"
        remindAction.title = "REMIND LATER"
        remindAction.activationMode = .Background
        remindAction.destructive = false
        //  remindAction.authenticationRequired = false

        let skipAction = UIMutableUserNotificationAction()
        skipAction.identifier = "SKIP_TODO"
        skipAction.title = "SKIP IT"
        skipAction.activationMode = .Background
        skipAction.destructive = false
        skipAction.authenticationRequired = false


        let todoCategory = UIMutableUserNotificationCategory()
        todoCategory.identifier = "TODO_CATEGORY"
        todoCategory.setActions([completeAction, remindAction, skipAction], forContext: .Default)
        todoCategory.setActions([completeAction,remindAction,skipAction], forContext: .Minimal)


        if application.respondsToSelector("isRegisteredForRemoteNotifications")
        {

            let categories = NSSet(array: [todoCategory,todoVideoCategory])
            let types:UIUserNotificationType = ([.Alert, .Sound, .Badge])

            let settings:UIUserNotificationSettings = UIUserNotificationSettings(forTypes: types, categories: categories as? Set<UIUserNotificationCategory>)

            application.registerUserNotificationSettings(settings)
            application.registerForRemoteNotifications()

        }

    }

Answer 3

在 Objective-C 上试试这个：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:    (NSDictionary *)launchOptions
{
// are you running on iOS8?
if ([application respondsToSelector:@selector(registerUserNotificationSettings:)]) 
  {
    UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:(UIUserNotificationTypeBadge|UIUserNotificationTypeAlert|UIUserNotificationTypeSound) categories:nil];
    [application registerUserNotificationSettings:settings];
  } 
else // iOS 7 or earlier
  {
    UIRemoteNotificationType myTypes = UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeAlert | UIRemoteNotificationTypeSound;
    [application registerForRemoteNotificationTypes:myTypes];
  }
}

对于斯威夫特：

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool {
// Override point for customization after application launch.
 if(UIApplication.instancesRespondToSelector(Selector("registerUserNotificationSettings:")))
 {
    application.registerUserNotificationSettings(UIUserNotificationSettings(forTypes: UIUserNotificationType.Sound | UIUserNotificationType.Alert | UIUserNotificationType.Badge, categories: nil))
 }
 else
 {
    //
 }
return true
}

Answer 4

我刚刚遇到了同样的问题。似乎在 iOS 8 中我们需要做一个额外的步骤，通常在内部完成：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { /*...*/ }

如果您想保持向后兼容，可以使用此代码：

#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 80000
    if ([UIApplication instancesRespondToSelector:@selector(registerUserNotificationSettings:)])
    {
        [[UIApplication sharedApplication] registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert | UIUserNotificationTypeBadge | UIUserNotificationTypeSound categories:nil]];
    }
#endif

系统会记住这个决定，并且只会询问一次。

Answer 5

将此代码放在您将首先对通知进行编程的视图控制器中（如果您在启动时对其进行编程，那么它将是application:didFinishLaunchingWithOptions:）：

if ([UIApplication instancesRespondToSelector:@selector(registerUserNotificationSettings:)]) {
    [[UIApplication sharedApplication] registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert|UIUserNotificationTypeSound categories:nil]];
}

在斯威夫特中：

if(UIApplication.instancesRespondToSelector(Selector("registerUserNotificationSettings:"))) {
    UIApplication.sharedApplication().registerUserNotificationSettings(UIUserNotificationSettings(forTypes: .Alert | .Sound, categories: nil))
}

针对系统版本号进行测试的解决方案是次优且容易出错的。