Support linking brownfield iOS apps

[dhei]

Starting from react-native@0.50.0, react-native link supports installing from Podfile for brownfield react native applications.

This change will allow to link projects that contains its own .podspec file to CocoaPods-based projects. In case link detect Podfile in iOS directory, it will look for related .podspec file in linked project directory, and add it to Podfile. If Podfile and .podspec files are not present, it will fall back to previous implementation.

Previously it's difficult to install appcenter dependencies from Podfile via pod install. Even with pod install installed appcenter dependencies, users still need to figure out how to run rnpm postinstall script to configure appcenter-analytics and appcenter-crashes module correctly. With react-native link supports Podfile out-of-box, it's much easier to use our sdk in brownfield applications.

In other words, adding the following lines to the Podfile of your brownfield app, then run react-native link should integrate App Center SDK to your app.

  # Pods for MyApp
  pod 'appcenter', path: '../node_modules/appcenter/ios'
  pod 'appcenter-analytics', path: '../node_modules/appcenter-analytics/ios'
  pod 'appcenter-crashes', path: '../node_modules/appcenter-crashes/ios'
  pod 'appcenter-push', path: '../node_modules/appcenter-push/ios'

An example Podfile in ios directory will install App Center dependencies properly:

target 'TestApp' do
  pod 'React', path: '../node_modules/react-native', subspecs: [
    'Core',
    'RCTText',
    'RCTNetwork',
    'RCTWebSocket',
    'BatchedBridge',
    'RCTImage',
    'DevSupport',
    'RCTAnimation',
    'RCTActionSheet',
    'RCTLinkingIOS',
  ]
  pod 'yoga', path: '../node_modules/react-native/ReactCommon/yoga'

  # Pods for MyApp

  pod 'appcenter', path: '../node_modules/appcenter/ios'
  pod 'appcenter-analytics', path: '../node_modules/appcenter-analytics/ios'
  pod 'appcenter-crashes', path: '../node_modules/appcenter-crashes/ios'
  pod 'appcenter-push', path: '../node_modules/appcenter-push/ios'

  # Add new pods below this line

  platform :ios, '8.0'
end

This should fix #94.

[guperrot]

I don't see the change in linker script that enables this. Also we don't have a test app to cover this scenario, can you add one? Maybe just analytics at least.

[dhei]

@guperrot A sample brownfield app is added in the most recent commit.

There's no change in linker script because all the magic is done by react-native@0.50.0 itself. As long as brownfield iOS app add appcenter reference to Podfile, react-native link should take care of the rest.