title: ios google sign-in, How can I get user image url?
body: <p>I am working on iOS/Swift google sign-in. I made a demo in github. 
  My demo project: <a href="https://github.com/tanggod/GoogleSignIn.git" rel="noreferrer">https://github.com/tanggod/GoogleSignIn.git</a></p>
  
  <p>According to google(<a href="https://developers.google.com/identity/sign-in/ios/api/interface_g_i_d_profile_data#a8e229bffe211894473058c4ba247553c" rel="noreferrer">https://developers.google.com/identity/sign-in/ios/api/interface_g_i_d_profile_data#a8e229bffe211894473058c4ba247553c</a>), the user image url can be fetched like this:</p>
  
  <ul>
  <li>(NSURL *) imageURLWithDimension:      (NSUInteger)    dimension<br>
  Gets the user's profile image URL for the given dimension in pixels for each side of the square.</li>
  </ul>
  
  <p>But, when I try to get imageURLWithDimension(120), the App always crash. I have been struggling on this for half an day and still don't know why.
  Anybody can help me. thank you very much.</p>
  
  <pre><code>func signIn(signIn: GIDSignIn!, didSignInForUser user: GIDGoogleUser!, withError error: NSError!) {
      print("=== UIViewController sign in")
  
      if (error == nil) {
          // Perform any operations on signed in user here.
          let userId = user.userID                  // For client-side use only!
          //let idToken = user.authentication.idToken // Safe to send to the server
          let name = user.profile.name
          let email = user.profile.email
          if user.profile.hasImage{
              // crash here !!!!!!!! cannot get imageUrl here, why?
              // let imageUrl = user.profile.imageURLWithDimension(120)
              let imageUrl = signIn.currentUser.profile.imageURLWithDimension(120)
              print(" image url: ", imageUrl.absoluteString)
          }
          // ...
          print(" userId: ", userId)
          //            print(" idToken: ", idToken)
          print(" name: ", name)
          print(" email: ", email)
          labelName.text = name
          labelEmail.text = email
      } else {
          print("\(error.localizedDescription)")
      }
  }
  </code></pre>
  
  <p>the crash data is as follows:</p>
  
  <pre><code>2015-09-30 18:54:46.662 GoogleLogin[96614:] &lt;GMR/INFO&gt; App measurement v.1100000 started
  2015-09-30 18:54:46.675 GoogleLogin[96614:5594982] Successfully configured [SignIn].
  2015-09-30 18:54:46.675 GoogleLogin[96614:5594982] Failed to configure [].
  2015-09-30 18:54:46.676 GoogleLogin[96614:5594982] Subspecs not present, so not configured [Analytics, AdMob, AppInvite, CloudMessaging, Maps].
  2015-09-30 18:54:46.676 GoogleLogin[96614:5594982] Subspecs expected to be present [SignIn, Measurement].
  2015-09-30 18:54:46.706 GoogleLogin[96614:] &lt;GMR/INFO&gt; Network status has changed. code, status: 2, Connected
  === UIViewController sign in
  2015-09-30 18:54:49.335 GoogleLogin[96614:5594982] -[NSURL isFIFEUrl]: unrecognized selector sent to instance 0x7fe248c335c0
  2015-09-30 18:56:46.968 GoogleLogin[96614:5594982] -[NSURL isFIFEUrl]: unrecognized selector sent to instance 0x7fe248f11f20
  2015-09-30 18:56:46.973 GoogleLogin[96614:5594982] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSURL isFIFEUrl]: unrecognized selector sent to instance 0x7fe248f11f20'
  *** First throw call stack:
  (
      0   CoreFoundation                      0x0000000102304f65 __exceptionPreprocess + 165
      1   libobjc.A.dylib                     0x0000000104927deb objc_exception_throw + 48
      2   CoreFoundation                      0x000000010230d58d -[NSObject(NSObject) doesNotRecognizeSelector:] + 205
      3   CoreFoundation                      0x000000010225af7a ___forwarding___ + 970
      4   CoreFoundation                      0x000000010225ab28 _CF_forwarding_prep_0 + 120
      5   GoogleLogin                         0x0000000101db6214 -[GIDProfileData imageURLWithDimension:] + 75
      6   GoogleLogin                         0x0000000101d29d0d _TFC11GoogleLogin14ViewController6signInfS0_FTGSQCSo9GIDSignIn_16didSignInForUserGSQCSo13GIDGoogleUser_9withErrorGSQCSo7NSError__T_ + 2541
      7   GoogleLogin                         0x0000000101d2aa98 _TToFC11GoogleLogin14ViewController6signInfS0_FTGSQCSo9GIDSignIn_16didSignInForUserGSQCSo13GIDGoogleUser_9withErrorGSQCSo7NSError__T_ + 88
      8   GoogleLogin                         0x0000000101dbdeb8 __37-[GIDSignIn addCallDelegateCallback:]_block_invoke + 123
      9   GoogleLogin                         0x0000000101db5ab6 -[GIDCallbackQueue fire] + 147
      10  GoogleLogin                         0x0000000101dbdacb __38-[GIDSignIn addDecodeIdTokenCallback:]_block_invoke_2 + 385
      11  libdispatch.dylib                   0x00000001053eaef9 _dispatch_call_block_and_release + 12
      12  libdispatch.dylib                   0x000000010540b49b _dispatch_client_callout + 8
      13  libdispatch.dylib                   0x00000001053f334b _dispatch_main_queue_callback_4CF + 1738
      14  CoreFoundation                      0x00000001022653e9 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9
      15  CoreFoundation                      0x0000000102226939 __CFRunLoopRun + 2073
      16  CoreFoundation                      0x0000000102225e98 CFRunLoopRunSpecific + 488
      17  GraphicsServices                    0x00000001066b5ad2 GSEventRunModal + 161
      18  UIKit                               0x00000001034b0676 UIApplicationMain + 171
      19  GoogleLogin                         0x0000000101d2c36d main + 109
      20  libdyld.dylib                       0x000000010543f92d start + 1
  )
  libc++abi.dylib: terminating with uncaught exception of type NSException
  (lldb) 
  </code></pre>
  
  <p>And it says signIn.currentUser.profile.imageURLWithDimension(120) is invalid expression:
  <a href="https://i.stack.imgur.com/dhGJZ.png" rel="noreferrer"><img src="https://i.stack.imgur.com/dhGJZ.png" alt="enter image description here"></a></p>