Terminating app due to uncaught exception 'Attempt to call unavailable initializer.', reason: 'Called: init Designated Initializer:initWithAuthState:' about gtmappauth HOT 3 OPEN

I think:
let authorization = GTMAppAuthFetcherAuthorization.init(authState: authState!)

Should be:
let authorization = GTMAppAuthFetcherAuthorization. initWithAuthState(authState: authState!)

That exception is thrown when the default initializer is called.

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I managed to get it working with my sample project for Swift/ macOs - if this is still an issue- then please see the code there. I think its down to how you handle your URL pickup.

Pull request is #60

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This issue should track the fact that because of the way the initializers are declared, Swift does not know that GTMAppAuthFetcherAuthorization.init() is an invalid initializer. So you can compile code that will always crash. That's not right, it should be marked as unavailable to swift or whatever pragma you like, in order that GTMAppAuthFetcherAuthorization.init() does not compile.

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