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Ios swift – Check iPhone vs iPad device type on background thread

I have this code:

public enum DeviceUtil {
  public static var isPhone: Bool {
    return UIDevice.current.userInterfaceIdiom == .phone
  }
}

And I got warning saying UIDevice API has to be on the main actor. I have a few places where I have to check the device type in background thread.

Is there other API i can use that works on background thread?

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2

Answers


  1. 0

    There is no need to call UIDevice.current.userInterfaceIdiom every time. The device won’t change.

    You could replace the computed property with a static assignment

    public enum DeviceUtil {
  public static var isPhone = UIDevice.current.userInterfaceIdiom == .phone
}

    Then, as long as your first access to this property is on the main thread you are good.

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  2. 0

    The warning you’re seeing is because UIDevice API calls should be performed on the main thread due to UIKit’s thread-safety requirements. To address this, you can create a utility function that ensures the check is performed on the main thread, even when called from a background thread.

    import UIKit

public enum DeviceUtil {
    @MainActor
    public static var isPhone: Bool {
        return UIDevice.current.userInterfaceIdiom == .phone
    }
    
    @MainActor public static func isPhone(completion: @escaping (Bool) -> Void) {
        if Thread.isMainThread {
            completion(isPhone)
        } else {
            DispatchQueue.main.async {
                completion(isPhone)
            }
        }
    }
}

    Usage

    checking device type in Background Thread

    DispatchQueue.global(qos: .background).async {
    DeviceUtil.isPhone { isPhone in
        if isPhone {
            print("Running on an iPhone")
        } else {
            print("Running on an iPad")
        }
    }
}

    checking device type in main thread

    DeviceUtil.isPhone { isPhone in
    if isPhone {
        print("Running on an iPhone")
    } else {
        print("Running on an iPad")
    }
}
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