Changing text of UIButton programmatically swift

Question

In Swift 3, 4, 5:

button.setTitle("Button Title", for: .normal)

Otherwise:

button.setTitle("Button Title", forState: UIControlState.Normal)

Also an @IBOutlet has to declared for the button.

Just a clarification for those new to Swift and iOS programming. Below line of code:

button.setTitle("myTitle", forState: UIControlState.Normal)

only applies to IBOutlets, not IBActions.

So, if your app is using a button as a function to execute some code, say playing music, and you want to change the title from Play to Pause based on a toggle variable, you need to also create an IBOutlet for that button.

If you try to use button.setTitle against an IBAction you will get an error. Its obvious once you know it, but for the noobs (we all were) this is a helpful tip.

Swift 5.0

// Standard State
myButton.setTitle("Title", for: .normal)

Swift 5:

    let controlStates: Array<UIControl.State> = [.normal, .highlighted, .disabled, .selected, .focused, .application, .reserved]
    for controlState in controlStates {
        button.setTitle(NSLocalizedString("Title", comment: ""), for: controlState)
    }

Swift 3:

Set button title:

//for normal state:
my_btn.setTitle("Button Title", for: .normal)

// For highlighted state:
my_btn.setTitle("Button Title2", for: .highlighted)

Changing title when attributed is a bit different :

I just ran into a problem : If you have an UIButton with an Attributed Title, you have to use :

my_btn.setAttributedTitle(NSAttributedString(string: my_title), for: my_state)

as, per Apple SetTitle Doc :

If you set both a title and an attributed title for the button, the button prefers the use of the attributed title over this one.

I had an attributed title and I tried to setTitle on it, with no effect...