How to use UIButton as Toggle Button?

Question

I am trying to create a toggle button for each cell in my table. When pressed, it will change the image and when pressed again it will change the image again -- Toggle.

Answer 1

Swift 4.0 Solution (using Storyboards)

First, ensure the UIButton Type is set to Custom in the Attributes Inspector.

// Reference to UIButton in Storyboard
@IBOutlet weak var toggleButton: UIButton!

override func viewDidLoad() {
    super.viewDidLoad()

    // assumes you have two images in the bundle/project 
    // called normal.png and selected.png.
    let normalImage = UIImage(named: "normal.png")
    let selectedImage = UIImage(named: "selected.png")

    toggleButton.setImage(normalImage, for: .normal)
    toggleButton.setImage(selectedImage, for: .selected)
}

Below screenshot demonstrates reference to toggleButton in Storyboard, and Touch Up Inside Event, ie: a user tapping the button, which fires off didPressButton below.

@IBAction func didPressButton(_ sender: Any) {

    // if the button was selected, then deselect it.
    // otherwise if it was not selected, then select it.
    toggleButton.isSelected = !trackingButton.isSelected

    if toggleButton.isSelected {
        print("I am selected.")

    } else {
        print("I am not selected.")
    }
}