无法更改IOS中的应用徽章

Question

我正在尝试为应用图标添加徽章，但根本没有任何反应。

UIApplication.sharedApplication().registerUserNotificationSettings(UIUserNotificationSettings(forTypes: UIUserNotificationType.Sound | UIUserNotificationType.Alert | UIUserNotificationType.Badge, categories: nil))
UIApplication.sharedApplication().applicationIconBadgeNumber = 40;

我在这段代码中遗漏了什么吗？

Answer 1

您是否要求获得更改徽章的许可？这在iOS8中已更改，需要特定权限：

let settings = UIUserNotificationSettings(forTypes: UIUserNotificationType.Badge, 
                                        categories: nil)
UIApplication.sharedApplication().registerUserNotificationSettings(settings)

Answer 2

注册远程通知

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

let settings = UIUserNotificationSettings(forTypes: UIUserNotificationType.Badge, 
                                        categories: nil)
UIApplication.sharedApplication().registerUserNotificationSettings(settings)
        return true
    }

更新您的徽章编号

UIApplication.sharedApplication().applicationIconBadgeNumber = 40;

Answer 3

以前的答案都很旧。

iOS 10及更高版本：

let options: UNAuthorizationOptions = [.alert, .sound, .badge];             
UNUserNotificationCenter.current()(options: options) { (granted, error) in
    //print("granted: \(granted)")
    if let error = error {
        print("Error requestAuthorization: \(error.localizedDescription)")
    }                   
}