[iOS] Update iOS headers breaks on RN 0.40.0

[HofmannZ]

Hey could you update the ios headers like this repo did.

They changed it in RN 0.40.0 and brakes all packages with iOS headers 😕.
I suggest you branch of since they did not make it backward compatible so you can still keep support for RN < 0.40.0.

For more info check this: https://github.com/facebook/react-native/releases/tag/v0.40.0.

[BretJohnson]

To fix this and maintain backwards compatibility with RN <= 0.39 without having to branch you can also change your includes like below, using #if __has_include. That's what we did for our React Native libraries and it worked well.

// Support React Native headers both in the React namespace, where they are in RN version 0.40+,
// and no namespace, for older versions of React Native
#if __has_include(<React/RCTBridge.h>)
#import <React/RCTBridge.h>
#else
#import "RCTBridge.h"
#endif

[fmmajd]

@BretJohnson where should we add this?

[BretJohnson]

See more here: https://github.com/facebook/react-native/releases/tag/v0.40.0.
Basically every react header now has moved into the React namespace. So every #import "RCT..." you have in your .h and .m files should now change to #import <React/RCT...> for RN version 0.40 and above. For RN versions less than 0.40 it should continue to #import "RCT..." the old way. And that #if __has_include(...) check above can be used to support both versions of RN without branching your code. Here's an example change I made earlier to our stuff for this: microsoft/appcenter-sdk-react-native@2164036.

[egunsoma]

This works for me on local machine, please verify this.

[wkh237]

@BretJohnson and @egunsoma , thanks for the information and PR, looks like this is a great way to solve #223 👍 The PR already merged will publish a new release today 😄

[wkh237]

Already published to npm, please upgrade the packge to 0.10.2-beta.8 and verify if it works, thanks !