Swift 4 Cocoapods Issue (How to Fix)

[jeco1996]

Lock Error/warnings on project from scratch and already advanced project..
I had project I was building, since I moved today from swift 3 to swift 4(today I installed xcode 9), Lock framework failed to compile.

I gave it a try on a fresh project(from scratch, whose only has one view controller and the only frameworks that it has is Lock and Auth0) and it failed again, so I have realized it is not something about the project itself but maybe incompatibility with swift 4 and xcode 9. ( I am using Lock 2.4.9, and Auth0 1.8)

[cocojoe]

The latest Lock 2.4.0 is compatible with Xcode 9 in the sense it will compile as Swift 3.2 lib while your main project is Swift 4.0 and it's absolutely fine to mix.

The problem here (I'm guessing you're using Cocoapods as there is no issue with carthage ) is the Cocoapods will force the pods to become the Swift version of your project which is 4.0. You can read about this here CocoaPods/CocoaPods#6791

There is thankfully a workaround, add the post_install step to the end of your Podfile.

# Uncomment the next line to define a global platform for your project
# platform :ios, '9.0'

target 'myapp' do
  # Comment the next line if you're not using Swift and don't want to use dynamic frameworks
  use_frameworks!

  # Pods for myapp
  pod 'Lock', '~>2.4'
  pod 'Auth0', '~>1.8'

end

post_install do |installer|
  # List of Pods to use as Swift 3.2
  myTargets = ['Lock']

  installer.pods_project.targets.each do |target|
    if myTargets.include? target.name
      target.build_configurations.each do |config|
        config.build_settings['SWIFT_VERSION'] = '3.2'
      end
    end
  end
end

I'll leave this ticket open for others to see.

[jeco1996]

Awesome! Thank you very much guys!

[cocojoe]

I'm going to leave it open just now for visibility, perhaps it's worth adding to the README.

[b-d]

This fixed the swift 4 errors for me but now I'm getting:

" 'shared' is unavailable: Use view controller based solutions where appropriate instead. "

in Auth0/ControllerModalPresenter

[cocojoe]

@b-d what are you making, it sounds like you are making something that doesn't have a view controller, like an app extension. Please create a new issue and provide sample code. I don't believe this is a Swift 4 related issue. Thx

[helloniklas]

v 1.9 gives me

Cannot convert value of type '(_) -> ()' to expected argument type 'SFAuthenticationSession.CompletionHandler' (aka '(Optional<URL>, Optional<Error>) -> ()')

This fix does not seem to solve it.

[cocojoe]

I imagine you probably have to deintegrate the pod and reinstall for an existing project vs a new one.
So I just quickly checked this, you can also update setting in the existing Xcode project.
Set to Swift 3.2

[nderkach]

Any plans to upgrade the code to Swift 4?

[cocojoe]

Yes, along with some other bigger changes so keep an eye out.

[adolfo]

@cocojoe Any update on Swift 4 release timeframe? We are currently blocked from updating our own pod to Swift 4 since you can't lint mixed podspecs and we have Lock as a dependency.

[cocojoe]

@adolfo

1. This may be fixed in Cocoapods 1.4 (beta), I read they were addressing the issue of mixed pods, although it may just be for installation of pods vs lib functionality.
2. You could also fork and migrate to Swift 4, it's not so bad.
3. Lock 3.x will have a complete redesign, I can not give you a timeframe on an official release. However, if possible I would like to see a beta release towards the end of the month.

[cocojoe]

There is a PR that adds 3.2/4.0 compatibility, this should negate the above issue. #480

@adolfo We will release early this week, if you want to try out this branch and feedback that would be great.

[adolfo]

@cocoojoe thank you, I’ll test it out