How to know when the button is pressed and canceled Button pressing

问题

I made a button. And used the below code. But it doesn't work at all.

override func pressesBegan(_ presses: Set<UIPress>, with event: UIPressesEvent?) {
    print("pressTest")
    btnConvert.isHidden = true
}

How can I know when the button is pressed and when button pressing is canceled?

回答1:

Use the built-in UIButton functions - .touchDown, .touchUpInside, .touchUpOutside.

Touch begin:

myButton.addTarget(target, action: action, for: .touchDown)

Touch ends:

myButton.addTarget(target, action: action, for: .touchUpInside)
myButton.addTarget(target, action: action, for: .touchUpOutside)

来源：https://stackoverflow.com/questions/41947279/how-to-know-when-the-button-is-pressed-and-canceled-button-pressing