iOS 10 以上通过 userNotification.framework 请求授权

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UNUserNotificationCenter.current().getNotificationSettings { (settings) in
    switch settings.authorizationStatus {
    case .authorized:
        DispatchQueue.main.async {
            UIApplication.shared.registerForRemoteNotifications()
        }
    case .notDetermined:
        UNUserNotificationCenter.current().requestAuthorization(options: [.badge, .alert, .sound]) { (granted, error) in
            if granted {
                DispatchQueue.main.async {
                    UIApplication.shared.registerForRemoteNotifications()
                }
            } else {
                print("Notification authorization failed. ERROR: \(error?.localizedDescription ?? "")")
            }
        }
    default:
        break
    }
}

iOS7 及之前版本

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[[UIApplication sharedApplication] registerForRemoteNotificationTypes:
    (UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound | UIRemoteNotificationTypeAlert)];

iOS7 推送教程

iOS 7 和 iOS 8 推送教程

iOS 8 - iOS 10

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