swift - How to get notified when iPhone battery is at 10% -

i'm building apple watch app let see iphone battery level, code battery level:

 uidevice.currentdevice().batterymonitoringenabled = true  batterylevel = uidevice.currentdevice().batterylevel 

now how can call notification when iphone battery @ 10%? thanks

this objective-c translated swift:

    [[uidevice currentdevice] setbatterymonitoringenabled:yes];     float battery = [[uidevice currentdevice] batterylevel];      if (battery < alertlevel) {         //send notification        } 

how send uilocalnotification

        uilocalnotification *notification = [[uilocalnotification alloc] init];         notification.firedate = [nsdate datewithtimeintervalsincenow:0];         notification.alertbody = @"warning!";         notification.timezone = [nstimezone defaulttimezone];         notification.soundname = uilocalnotificationdefaultsoundname;         notification.applicationiconbadgenumber = 0;         nsdictionary *infodict = [nsdictionary dictionarywithobject:@"low battery!" forkey:@"notification"];         notification.userinfo = infodict;         [[uiapplication sharedapplication] schedulelocalnotification:notification];