selector parameters

func textFieldShouldReturn(textField: UITextField) -> Bool { //delegate method

Selector for the method above is Selector("textFieldShouldReturn:"), the first parameter does not have an external name and it is not included in the selector.

(Of course, as you tried, in many cases enclosing with Selector( ) is not needed.)

Sometimes you need to add @objc annotation to the method to make it accessible with its selector, but maybe this is not the case.

var done: UIBarButtonItem = UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.Done, target: textField, action:"textFieldShouldReturn:")

returns this at runtime:

[UITextField textFieldShouldReturn:]: unrecognized selector sent to instance

I think it has something to do with -what- is being passed.

then again, I'm asking for help so...

are there some rules that I may be ignorant of when passing parameters to these conjured method references? I'm still fuzzy on how the compiler gets from a "string" to a spot in memory to execute.

Thank you for the help. 🙂

I was missing your target set to textField. UITextField does not have textFieldShouldReturn: method, UITextFieldDelegate does.

If your view controller is being the UITextFieldDelegate and your code is written in the view controller, target: self will work.

Your code needs too much guess, I was missing another thing. Updating.

ah. ok, I see.

Now, I get into the correct method but the passed object is a UIBarButtonItem and not the UITextField.

Why is that? is there a way to explicitly tell it what parameter to pass?

I 'm sorry to impose, but I cannot seem to find documentation spells this out clearly for me.

cheers

/chossy

Usually, calling UITextFieldDelegate method from your app code explicitly has no meaning. The method is called from within the UITextField, to customize its default behavior.

I guess you need and want to do something like this:

To setup UIBarButtonItem:

        var done: UIBarButtonItem = UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.Done, target: self, action:"doneAction:")

And in the same class, declare the action method:

    func doneAction(sender: AnyObject) {
        //Do something for textField
    }

You need to fill up `Do something for textField`, with what you actually intend to do.

Not sure what you are doing here. What is the purpose of the text field? The action method should be a simple method that gets called when the user taps the bar button.

A textFieldShouldReturn: method is only called when the user taps the return key on the keyboard while in an edit field.

Thank you very much for your time and thought on this.

I was hoping for something more elegant but I can see now that I'll have to go the long way around as they say.

once again. thank you so much for your time.

cheers

/chossy