How to change UIButton state programmatically in Swift

Question

I develop app for drawing on screen. I have toolpanel with bunch of buttons. Some of them have to become disabled or pressed depending on current user action. How can I change UIControlState of buttons programmatically considering that "state" property is readonly? If it's impossible, what is alternative for this purpose?

Answer 1

I think you're confused. UIControlState is used to set up target/actions, or to change the appearance of the button for specific states (So, for example, you can specify the image that's used when it's selected, and a different image for when the button is not in the selected state.)

If you want to change the state to selected, you just set the selected property.

button.isSelected = true

Likewise for isEnabled:

button.isEnabled = false //disable the button

Answer 2

Use the correct property to change the state. For example

button.isSelected = true

or

button.isHighlighted = true