swift - CoreLocation User Speed -


i trying current user's device movement speed. here's code:

import uikit import foundation import corelocation  class viewcontroller: uiviewcontroller, cllocationmanagerdelegate {  let manager = cllocationmanager() var currentspeed = 0.0  override func viewdidload() {     super.viewdidload()      manager.requestwheninuseauthorization()      manager.delegate = self     manager.desiredaccuracy = kcllocationaccuracyhundredmeters     manager.startupdatinglocation() }  func locationmanager(manager: cllocationmanager, didupdatelocations locations: [cllocation]) {     print(manager.location?.speed) }  func locationmanager(manager: cllocationmanager, didfailwitherror error: nserror) {     print("error: \(error.localizeddescription)") }

the issue prints "optional(-1,0)"

thanks in advance.

core location give negative value speed if device isn't moving, or moving enough math doesn't make sense.

https://developer.apple.com/library/ios/documentation/corelocation/reference/cllocation_class/#//apple_ref/occ/instp/cllocation/speed


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