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I've got a function in my code to check if we can have permission to display a UILocalNotification. 

open func hasPermission() -> Bool {
    if let permissions = UIApplication.shared.currentUserNotificationSettings {
        if permissions.types.contains(.alert) {
            return true
        }
    }
    return false
}

This code has triggered a warning in Xcode 9:

UI API called from background thread: UIApplication.currentUserNotificationSettings must be used from main thread only

How do I fix this? I know there is the DispatchQueue.main.async method, just not sure how to implemented that.

Rool Paap
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1 Answers1

1

You can do it like this.

DispatchQueue.main.async {
    if hasPermission() {
        //
    }
}
Bilal
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  • This is part of a background job, so I'd prefer to do as little as possible on the main thread. This particular check is done as a guard hasPermission() else { – Rool Paap Oct 26 '17 at 08:20