The Simplest Checkbox UIButton

You don’t need to change the image on tap!

Buttons can change their own images when their state changes, so you only need to change the button state:

button.setImage(UIImage(systemName: "square"), for: .normal)
button.setImage(UIImage(systemName: "checkmark.square.fill"), for: .selected)
button.addAction(UIAction { _ in button.isSelected.toggle() }, for: .touchUpInside)

You can also setTitle() and it will all work out-of the box, though you may want to adjust the button.configuration to make it look nice.

For a full (yet short) implementation, see my gist:
CheckboxButton.swift

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