swift - Why isn't iPhone transferring an array to Apple Watch? -

i have array stored on iphone need sent watch in background whenever updated on phone. i've followed tutorial on raywenderlich.com can't seem work.

phone code:

import uikit import foundation import watchconnectivity  class viewcontroller: uiviewcontroller, wcsessiondelegate {  var array1 = ["hi", "this", "is", "a", "test"]() var array2 = ["1", "2", "3", "4", "5"]()   var session: wcsession?  private func startsession() {      if wcsession.issupported() {          session = wcsession.defaultsession()         session?.delegate = self         session?.activatesession()      }  } private func sendtowatch() {      if let session = session session.reachable {          session.transferuserinfo(["array1": array1])      }      if let session = session session.reachable {          session.transferuserinfo(["array2": array2])      }  }  sendtowatch()  } 

and watch code:

import watchkit import foundation import watchconnectivity  var array1 = [string]()  var array2 = [string]()  class interfacecontroller: wkinterfacecontroller, wcsessiondelegate {  var session: wcsession?  @iboutlet var table: wkinterfacetable!  override func awakewithcontext(context: anyobject?) {     super.awakewithcontext(context)      startsession()      table!.setnumberofrows(array1.count, withrowtype: "tablerowcontroller")      var index = 0      while index < array1.count {          let row = table.rowcontrolleratindex(index) as! tablerowcontroller          row.rowlabel.settext(array1[index])          row.datelabel.settext(array2[index])          index++      }  }  private func startsession() {      if wcsession.issupported() {          session = wcsession.defaultsession()         session?.delegate = self         session?.activatesession()      }  }  func session(session: wcsession, didreceiveuserinfo userinfo: [string : anyobject]) {      if let received1 = userinfo["array1"] as? [string] {         dispatch_async(dispatch_get_main_queue(), { () -> void in             array1 = received1         })     }      if let received2 = userinfo["array2"] as? [string] {         dispatch_async(dispatch_get_main_queue(), { () -> void in             array2 = received2         })     }  }  } 

the table on watch works fine if enter dummy data arrays, know set correctly. i'm having problems transfer/receiving.

second attempt:

i'm trying use updateapplicationcontext() opposed transferuserinfo(). i've removed session.reachable check , changed code.

phone code:

 private func sendtowatch() { {         let applicationdict = ["array1": array1]         let applicationdict2 = ["array2": array2]         try wcsession.defaultsession().updateapplicationcontext(applicationdict)         try wcsession.defaultsession().updateapplicationcontext(applicationdict2)     }  catch {         print(error)     } } 

watch code:

func session(session: wcsession, didreceiveapplicationcontext applicationcontext: [string : anyobject]) {      //i can't figure out how retrieve data!      print(applicationcontext) // returns nil      array1 = applicationcontext["array1"] as! [string] //returns nil , crashes app     array2 = applicationcontext["array2"] as! [string] //returns nil , crashes app  } 

third attempt:

i'm able sometimes either array1 or array2 appear on watch. of course, crashes app both arrays not received. can me this?

watch code:

func session(session: wcsession, didreceiveapplicationcontext applicationcontext: [string : anyobject]) {      dispatch_async(dispatch_get_main_queue()) { () -> void in          if let retrievedarray1 = applicationcontext["array1"] as? [string] {              array1 = retrievedarray1              print(array1)          }          if let retrievedarray2 = applicationcontext["array2"] as? [string] {              array2 = retrievedarray2              print(array2)          }          self.table!.setnumberofrows(array1.count, withrowtype: "tablerowcontroller")          var index = 0          while index < array1.count {              let row = self.table.rowcontrolleratindex(index) as! tablerowcontroller              row.rowlabel.settext(array1[index]) //my crash happens either here or....              row.datelabel.settext(array2[index])  //here because both arrays aren't being received , unreceived array out of index              index++          }      }  } 

session.reachable true when watch app in foreground (there few rare exceptions).

if want send data watch app in background, should using updateapplicationcontext, transferuserinfo or transferfile (which 1 choose depends on sending , size).

so like:

updated code in response 3rd edit/question originator

phone code:

private func sendtowatch() { {         let applicationdict = ["array1": array1, "array2": array2]         try wcsession.defaultsession().updateapplicationcontext(applicationdict)     }  catch {         print(error)     } } 

watch code:

func session(session: wcsession, didreceiveapplicationcontext applicationcontext: [string : anyobject]) {      dispatch_async(dispatch_get_main_queue()) { () -> void in          if let retrievedarray1 = applicationcontext["array1"] as? [string] {              array1 = retrievedarray1              print(array1)          }          if let retrievedarray2 = applicationcontext["array2"] as? [string] {              array2 = retrievedarray2              print(array2)          }          self.table!.setnumberofrows(array1.count, withrowtype: "tablerowcontroller")          var index = 0          while index < array1.count {              let row = self.table.rowcontrolleratindex(index) as! tablerowcontroller              row.rowlabel.settext(array1[index])              row.datelabel.settext(array2[index])              index++          }      } }