如何使用Swift创建UIBarButton来调用UITapGestureRecognizer函数？

Question

My scenario, I am trying to implement UIBarButton click to call below two functions . Below code already working for view tab and pan but now I am changing button click to call below two functions. How to modify below code ?

@objc
    func handleCardTap(recognzier:UITapGestureRecognizer) {
        switch recognzier.state {
        case .ended:
            animateTransitionIfNeeded(state: nextState, duration: 0.9)
        default:
            break
        }
    }

    @objc
    func handleCardPan (recognizer:UIPanGestureRecognizer) {
        switch recognizer.state {
        case .began:
            startInteractiveTransition(state: nextState, duration: 0.9)
        case .changed:
            let translation = recognizer.translation(in: self.cardViewController.handleArea)
            var fractionComplete = translation.y / cardHeight
            fractionComplete = cardVisible ? fractionComplete : -fractionComplete
            updateInteractiveTransition(fractionCompleted: fractionComplete)
        case .ended:
            continueInteractiveTransition()
        default:
            break
        }

    }

Answer 1

If you need to call both these tap gesture recognizer functions from a UIBarButtonItem , your best bet is to create a custom view bar button item and add gesture recognizers to that custom view. Something like this would work:

let tapGestureView = UIView() // initialize & size this as you need
tapGestureView.addGestureRecognizer(UITapGestureRecognizer(action: #selector(handleCardTap(_:)), target: self))
tapGestureView.addGestureRecognizer(UITapGestureRecognizer(action: #selector(handleCardPan(_:)), target: self))
let barButton = UIBarButtonItem(customView: tapGestureView)

Here are some additional resources for UITapGestureRecognizers and UIBarButtonItems . It seems a bit odd to set up 2 different tap gestures for the same view, though, and one of them being a pan action (at least by name) seems odd, but this is how you'd accomplish that!