Overlapping pod dependencies - swift

Question

I am using cocoapods 0.39. I added Cocoa Touch Framework "MyFramework" as a separate target to my Swift project. The framework is using Firebase as a Cocoapod dependency. I am using MyFramework inside the the app. When I try to build the app I get multiple errors:
class … is implemented in both …/MyFramework.framework/MyFramework and …/MyApp.app/MyApp. One of the two will be used. Which one is undefined.
I understand what this error is about, but I am not able to fix it. If I remove Firebase from MyApp target then I can't use MyFramework inside the app as it depends on it. It looks like a common problem, but unfortunately I can't make it work.
My Podfile looks like this:
use_frameworks!
target 'MyApp' do
pod 'Firebase'
end
target 'MyAppTests' do
end
target 'MyFramework' do
pod 'Firebase'
end
target 'MyFrameworkTests' do
pod 'Firebase'
end

Answer 1

You are linking Firebase twice.
You can use inherit! :search_patchs directive in Podfile (requires Cocoapods 1.0 or higher) to let MyApp know about the dependencies without actually linking them:
use_frameworks!
target 'MyFramework' do
pod 'Firebase'
pod 'FirebaseAnalytics'
target 'MyApp' do
inherit! :search_paths
end
end
This requires that you explicitly declare dependencies in your Podfile to make them available in MyApp target. For example, adding pod 'Firebase' won't make using FirebaseAnalytics available in your application.
You can also convert MyFramework to a CocoaPod dependency and let CocoaPods handle the dependencies for you. To do this, create a Podspec file for your framework, like this:
Pod::Spec.new do |s|
# Meta data
s.name = "MyFramework"
s.version = "1.0.0"
s.platform = :ios
s.ios.deployment_target = '8.0'
s.summary = "-"
s.homepage = "-"
s.license = { :type => "MIT" }
s.author = { "Me" => "-" }
s.platform = :ios
s.ios.deployment_target = '8.0'
s.source = { :path => "MyFramework" }
# Source configuration
s.source_files = "MyFramework/**/*.swift"
s.resources = "MyFramework/**/*.{png,jpeg,jpg,storyboard,xib,strings}"
s.requires_arc = true
# Dependencies
# Firebase for iOS
s.dependency 'Firebase', '~> 3.0'
end
Then, you can add a development dependency to MyFramework in your application Podfile and remove Firebase dependency:
target 'MyApp' do
pod 'MyFramework', :path => '.'
end
Update . to the MyFramework.podspec location if needed.