Swift: Apply “addTarget” to a UIButton in a different class

Question

I have a class called RecordViewFooter where i create a UIButton called microphoneButton . I add as a subview and it looks beautiful.

However, when this button is selected i need to add something as a subview to my ViewController . So i did this in my ViewController :

    RecordViewFooter().microphoneButton.addTarget(self, action: "microphoneButtonPressed", forControlEvents: UIControlEvents.TouchUpInside)
    }
    func microphoneButtonPressed(){
    print("microphone button pressed")
    volumeAdjuster = VolumeAdjusterView(frame: CGRect(x: 0, y: 0, width: self.view.bounds.width, height: self.view.bounds.height))
    self.view.addSubview(volumeAdjuster!)
}

I can not figure out why it won't call the function when the button is selected. Any thoughts?

Answer 1

Try this modified code:

RecordViewFooter().microphoneButton.addTarget(self, action: "microphoneButtonPressed:", forControlEvents: UIControlEvents.TouchUpInside)

func microphoneButtonPressed(button:UIButton){
    print("microphone button pressed")
    volumeAdjuster = VolumeAdjusterView(frame: CGRect(x: 0, y: 0, width: self.view.bounds.width, height: self.view.bounds.height))
    self.view.addSubview(volumeAdjuster!)
}

Answer 2

You can solved that problem by implementing following solutions :

1. First Prepare object of RecordViewFooter class. like here i create object of RecordViewFooter() class.

    var popViewObj = UINib(nibName: "RecordViewFooter", bundle: nil).instantiateWithOwner(nil, options: nil)[0] as! RecordViewFooter 

2. now Write this code after subview done.

    popViewObj.microphoneButton.addTarget(self, action: "microphoneButtonPressed:",forControlEvents: UIControlEvents.TouchUpInside) 

3. Now Add Selected button Event in your code:

    func microphoneButtonPressed(sender: UIButton) { print("microphone button pressed") // Do Whatever u want... } 

4. it will work fine.. i hope u will done with this code.

Answer 3

I got it to work. I had to create an object from the class that i want to reference the global variable. Then do this:

    objectFromClass.globalVariable.addTarget(self, action: "buttonPressed", forControlEvents: UIControlEvents.TouchUpInside)