title: UnityAds generated iOS project error
body: <p>I'm using UnityAds for an iOS/Android game and when generating the Xcode project for iOS I get the following compiler errors related to UnityAdsWrapper.mm, a file generated by Unity</p>
  
  <pre><code>/ProjectDir/Builds/Build/Classes/UnityAds/UnityAdsUnityWrapper.mm:105:15: error: no known class method for selector 'sharedInstance'
  
                      [[UnityAds sharedInstance] setUnityVersion: UnityAdsCreateNSString(unityVersion)];
  
                                 ^~~~~~~~~~~~~~
  
  /ProjectDir/Builds/Build/Classes/UnityAds/UnityAdsUnityWrapper.mm:105:31: error: no known instance method for selector 'setUnityVersion:'
  
                      [[UnityAds sharedInstance] setUnityVersion: UnityAdsCreateNSString(unityVersion)];
  
                                                 ^~~~~~~~~~~~~~~
  
  /ProjectDir/Builds/Build/Classes/UnityAds/UnityAdsUnityWrapper.mm:126:18: error: no known class method for selector 'sharedInstance'
  
              if ([[UnityAds sharedInstance] canShowZone:zoneId])
  
                             ^~~~~~~~~~~~~~
  
  /ProjectDir/Builds/Build/Classes/UnityAds/UnityAdsUnityWrapper.mm:126:34: error: no known instance method for selector 'canShowZone:'
  
              if ([[UnityAds sharedInstance] canShowZone:zoneId])
  
                                             ^~~~~~~~~~~
  
  /ProjectDir/Builds/Build/Classes/UnityAds/UnityAdsUnityWrapper.mm:130:16: error: no known class method for selector 'sharedInstance'
  
                              [[UnityAds sharedInstance] setZone:zoneId withRewardItem:rewardItemKey];
  
                                         ^~~~~~~~~~~~~~
  
  /ProjectDir/Builds/Build/Classes/UnityAds/UnityAdsUnityWrapper.mm:130:32: error: no known instance method for selector 'setZone:withRewardItem:'
  
                              [[UnityAds sharedInstance] setZone:zoneId withRewardItem:rewardItemKey];
  
                                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  
  /ProjectDir/Builds/Build/Classes/UnityAds/UnityAdsUnityWrapper.mm:136:22: error: no known class method for selector 'sharedInstance'
  
                             [[UnityAds sharedInstance] setZone:zoneId];
  
                                        ^~~~~~~~~~~~~~
  
  /ProjectDir/Builds/Build/Classes/UnityAds/UnityAdsUnityWrapper.mm:136:38: error: no known instance method for selector 'setZone:'
  
                             [[UnityAds sharedInstance] setZone:zoneId];
  
                                                        ^~~~~~~
  
  /ProjectDir/Builds/Build/Classes/UnityAds/UnityAdsUnityWrapper.mm:139:22: error: no known class method for selector 'sharedInstance'
  
                      return [[UnityAds sharedInstance] show:optionsDictionary];
  
                                        ^~~~~~~~~~~~~~
  
  /ProjectDir/Builds/Build/Classes/UnityAds/UnityAdsUnityWrapper.mm:139:43: error: cannot initialize a parameter of type 'UIViewController * _Nonnull' with an lvalue of type 'NSMutableDictionary *__strong'
  
                      return [[UnityAds sharedInstance] show:optionsDictionary];
  
                                                             ^~~~~~~~~~~~~~~~~
  
  In file included from /ProjectDir/Builds/Build/Classes/UnityAds/UnityAdsUnityWrapper.mm:6:
  
  In file included from /ProjectDir/Builds/Build/Classes/UnityAds/UnityAdsUnityWrapper.h:10:
  
  /ProjectDir/Builds/Build/UnityAds.framework/Headers/UnityAds.h:175:34: note: passing argument to parameter 'viewController' here
  
  + (void)show:(UIViewController *)viewController;
  
                               ^
  
  /ProjectDir/Builds/Build/Classes/UnityAds/UnityAdsUnityWrapper.mm:146:21: error: no known class method for selector 'sharedInstance'
  
              return [[UnityAds sharedInstance] canShowZone:UnityAdsCreateNSString(rawZoneId)];
  
                                ^~~~~~~~~~~~~~
  
  /ProjectDir/Builds/Build/Classes/UnityAds/UnityAdsUnityWrapper.mm:146:37: error: no known instance method for selector 'canShowZone:'
  
              return [[UnityAds sharedInstance] canShowZone:UnityAdsCreateNSString(rawZoneId)];
  
                                                ^~~~~~~~~~~
  
  /ProjectDir/Builds/Build/Classes/UnityAds/UnityAdsUnityWrapper.mm:151:14: error: no known class method for selector 'sharedInstance'
  
              [[UnityAds sharedInstance] setDebugMode:debugMode];
  
                         ^~~~~~~~~~~~~~
  
  /ProjectDir/Builds/Build/Classes/UnityAds/UnityAdsUnityWrapper.mm:156:14: error: no known class method for selector 'sharedInstance'
  
              [[UnityAds sharedInstance] setCampaignDataURL:UnityAdsCreateNSString(url)];
  
                         ^~~~~~~~~~~~~~
  
  /ProjectDir/Builds/Build/Classes/UnityAds/UnityAdsUnityWrapper.mm:156:30: error: no known instance method for selector 'setCampaignDataURL:'
  
              [[UnityAds sharedInstance] setCampaignDataURL:UnityAdsCreateNSString(url)];
  
                                         ^~~~~~~~~~~~~~~~~~
  
  /ProjectDir/Builds/Build/Classes/UnityAds/UnityAdsUnityWrapper.mm:45:14: error: no known class method for selector 'sharedInstance'
  
              [[UnityAds sharedInstance] setDelegate:self];
  
                         ^~~~~~~~~~~~~~
  
  /ProjectDir/Builds/Build/Classes/UnityAds/UnityAdsUnityWrapper.mm:46:14: error: no known class method for selector 'sharedInstance'
  
              [[UnityAds sharedInstance] setDebugMode:debugMode];
  
                         ^~~~~~~~~~~~~~
  
  /ProjectDir/Builds/Build/Classes/UnityAds/UnityAdsUnityWrapper.mm:47:14: error: no known class method for selector 'sharedInstance'
  
              [[UnityAds sharedInstance] setTestMode:testMode];
  
                         ^~~~~~~~~~~~~~
  
  /ProjectDir/Builds/Build/Classes/UnityAds/UnityAdsUnityWrapper.mm:47:30: error: no known instance method for selector 'setTestMode:'
  
              [[UnityAds sharedInstance] setTestMode:testMode];
  
                                         ^~~~~~~~~~~
  
  fatal error: too many errors emitted, stopping now [-ferror-limit=]
  
  20 errors generated.
  </code></pre>
  
  <p>Anyone have a workaround or fix for this?</p>