Utility functions for iOS PushNotification

PushNotificationManager.swift

class PushNotificationManager {
    class var isPushNotificationEnable: Bool {
        let osVersion = UIDevice.currentDevice().systemVersion
        if osVersion < "8.0" {
            let types = UIApplication.sharedApplication().enabledRemoteNotificationTypes()
            if types == UIRemoteNotificationType.None {
                // push notification disabled
                return false
            }else{
                // push notification enable
                return true
            }
        }else{
            if UIApplication.sharedApplication().isRegisteredForRemoteNotifications() {
                // push notification enable
                return true
            }else{
                // push notification disabled
                return false
            }
        }
    }
    
    class func requestPushNotification() {
        let application = UIApplication.sharedApplication()
        let osVersion = UIDevice.currentDevice().systemVersion
        if osVersion < "8.0" {
            application.registerForRemoteNotificationTypes(UIRemoteNotificationType.Badge |
                UIRemoteNotificationType.Sound |
                UIRemoteNotificationType.Alert )
        }else{
            
            var types: UIUserNotificationType = UIUserNotificationType.Badge |
                UIUserNotificationType.Alert |
                UIUserNotificationType.Sound
            
            var settings: UIUserNotificationSettings = UIUserNotificationSettings(forTypes: types, categories: nil )
            application.registerUserNotificationSettings(settings)
            application.registerForRemoteNotifications()
        }
    }
    
    class func openAppSettingPage() -> Void {
        let application = UIApplication.sharedApplication()
        let osVersion = UIDevice.currentDevice().systemVersion
        if osVersion < "8.0" {
            // not supported
        }else{
            let url = NSURL(string:UIApplicationOpenSettingsURLString)!
            UIApplication.sharedApplication().openURL(url)
        }
    }
}