Detect UILabel text change in swift

Question

Is there a way to get notified when there is a change in a UILabel\'s text or would I be better off using a UITextField with userInteractionE

Answer 1

Swift 5

If you want to observe text changes in the label and make an animation. You need to create subclass UILabel

class ObservedLabelAnimate: SpringLabel {

    override var text: String? {
        didSet {
            if let text = text {
                if oldValue != text {
                    animation = "fadeInLeft"
                    duration = 1.2
                    animate()
                }
                print("This is oldvalue \(oldValue), and this is the new one \(text)")
            }
        }
    }
}

for this example, I subclass 'SpringLabel' that inherits from UILabel

from https://github.com/MengTo/Spring

Basically it will check if the oldValue and text (new one) is different then the animation will be fired

To use:

@IBOutlet weak var label: ObservedLabelAnimate!