CODEWITHSUNDEEP
iosswift
DannyBoi8181
DannyBoi8181

Reputation: 33

Returning UIAlertController from var

I am trying to return an alert controller using a computed property, however i am receiving the error "Cannot convert value of type '() -> _' to specified type 'UIAlertController'" I am pretty new to iOS development after coming from C development and I hope someone could explain weere I'm going wrong. Code sample below : 

@objc func saveButtonPressed(_ sender: UIBarButtonItem){
    var displayErrorController: UIAlertController = {
        let controller = UIAlertController(title: "Field not valid !",
                                           message: "Please fill out form",
                                           preferredStyle: .alert)
        controller.addAction(UIAlertAction(title: "OK", style: .ok, handler: nil))
        return controller
    }
    form.rows.forEach({
        if !$0.wasChanged {
            self.present(displayErrorController, animated: true, completion: nil)
            return
        }

    })
}

Upvotes: 0

Views: 125

Answers (1)

Callam
Callam

Reputation: 11539

You are assigning the variable a block that returns a UIAlertController but you're not executing it.

var displayErrorController: UIAlertController = {
    let controller = UIAlertController(title: "Field not valid !",
                                       message: "Please fill out form",
                                       preferredStyle: .alert)
    controller.addAction(UIAlertAction(title: "OK", style: .ok, handler: nil))
    return controller
}()

If you want to keep it as a computed property though, you need to change the property type to var displayErrorController: (UIAlertController) -> () = { ... }

Upvotes: 2

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