Unavailable Function

Unimplemented functions should be marked as unavailable

• Identifier: unavailable_function
• Enabled by default: No
• Supports autocorrection: No
• Kind: idiomatic
• Analyzer rule: No
• Minimum Swift compiler version: 5.0.0
• Default configuration:

  Key	Value
  severity	warning

Non Triggering Examples

class ViewController: UIViewController {
  @available(*, unavailable)
  public required init?(coder aDecoder: NSCoder) {
    preconditionFailure("init(coder:) has not been implemented")
  }
}

func jsonValue(_ jsonString: String) -> NSObject {
   let data = jsonString.data(using: .utf8)!
   let result = try! JSONSerialization.jsonObject(with: data, options: [])
   if let dict = (result as? [String: Any])?.bridge() {
    return dict
   } else if let array = (result as? [Any])?.bridge() {
    return array
   }
   fatalError()
}

func resetOnboardingStateAndCrash() -> Never {
    resetUserDefaults()
    // Crash the app to re-start the onboarding flow.
    fatalError("Onboarding re-start crash.")
}

Triggering Examples

class ViewController: UIViewController {
  public required ↓init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
  }
}

class ViewController: UIViewController {
  public required ↓init?(coder aDecoder: NSCoder) {
    let reason = "init(coder:) has not been implemented"
    fatalError(reason)
  }
}

class ViewController: UIViewController {
  public required ↓init?(coder aDecoder: NSCoder) {
    preconditionFailure("init(coder:) has not been implemented")
  }
}

↓func resetOnboardingStateAndCrash() {
    resetUserDefaults()
    // Crash the app to re-start the onboarding flow.
    fatalError("Onboarding re-start crash.")
}