Unity: iOS build errors compilation

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Missing RegisterMonoModule.h

With Unity 2019.3 or above if you use Facebook SDK you will get this error Missing RegisterMonoModule.h while building in XCode.

To fix this you can use this - https://gist.github.com/ntratcliff/3942abd1eed9d704713a27616f09628b

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Exception: Calling TargetGuidByName with name='Unity-iPhone' is deprecated.

In my case, I am using Unity 2019.4.17f1 and integrating MoPub for monetization. Then, I see this error when I try to build for iOS.

To fix this have to use GetUnityMainTargetGuid instead of TargetGuidByName.

So replace following

var target = project.TargetGuidByName("Unity-iPhone");

with

var target =
	#if UNITY_2019_3_OR_NEWER    
	    project.GetUnityMainTargetGuid();
	#else    
	    project.TargetGuidByName("Unity-iPhone");
	#endif

Reference: https://github.com/mopub/mopub-unity-sdk/issues/111

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'MoPub.h' file not found

When I integrated MoPub's Facebook Audience Network(FAN) mediation network, I saw this error. This is because FAN uses use_frameworks! and iOS won't build with use_frameworks! in Podfile.

Workaround:

1. Remove <iosPod name="MoPub-SDK-Plugin" minTargetSdk="10.0" path="Assets/MoPub/Plugins/iOS"/> from Assets/MoPub/Scripts/Editor/MoPubDependencies.xml

2. Delete Assets/MoPub/Plugins/iOS/MoPub-SDK-Plugin.podspec

3. Check iOS as platform for plugin for all files inside Assets/MoPub/Plugins/iOS

Reference: https://github.com/mopub/mopub-unity-sdk/issues/151