Callback for MSSticker Peels in iOS 10 iMessage sticker app

Question

I\'m experimenting with sticker iMessage apps in iOS 10 and I\'m running into an issue with the override func didStartSending(_ message: MSMessage, conversation: MSConvers

Answer 1

Here's a subclass and delegate that will tie into the tap and long press gesture recognizers that MSStickerView is using for select and peel interactions. If the implementation of MSStickerView changes this may no longer provide events, but shouldn't crash.

import UIKit
import Messages

protocol InstrumentedStickerViewDelegate: class {
    func stickerViewDidSelect(stickerView: MSStickerView)
    func stickerViewDidPeel(stickerView: MSStickerView)
}

class InstrumentedStickerView: MSStickerView {
    weak var delegate: InstrumentedStickerViewDelegate?

    override init(frame: CGRect) {
        super.init(frame: frame)

        for gestureRecognizer in gestureRecognizers ?? [] {
            if let tapGestureRecognizer = gestureRecognizer as? UITapGestureRecognizer {
                tapGestureRecognizer.addTarget(self, action: #selector(didTap))
            } else if let longPressGestureRecognizer = gestureRecognizer as? UILongPressGestureRecognizer {
                longPressGestureRecognizer.addTarget(self, action: #selector(didLongPress))
            }
        }
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    func didTap(tapGestureRecognizer: UITapGestureRecognizer) {
        if tapGestureRecognizer.state == .Recognized {
            delegate?.stickerViewDidSelect(self)
        }
    }

    func didLongPress(longPressGestureRecognizer: UILongPressGestureRecognizer) {
        if longPressGestureRecognizer.state == .Began {
            delegate?.stickerViewDidPeel(self)
        }
    }
}

Answer 2

This is a workaround for sticker peeled and tapped events, it is not guaranteed that a particular sticker will be inserted but an approximation of such data points - you will have to use your subclass of MSStickerView. This solution is not futureproof, but works for the time being IMHO, therefore I welcome other ideas.

import UIKit
import Messages

class CustomStickerView : MSStickerView{
    class GestureRecognizerReceiver : NSObject, UIGestureRecognizerDelegate{
        func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
            return true
        }
    }
    let _recognizerDelegate = GestureRecognizerReceiver()

    weak var _recognizer: UITapGestureRecognizer? = nil
    func setupTapRecognizer(){
        if _recognizer == nil {
            let r = UITapGestureRecognizer(target: self, action: #selector(_customTapReceived))
            r.cancelsTouchesInView = false
            r.delegate = _recognizerDelegate
            addGestureRecognizer(r)
            _recognizer = r
    }
}

    func _customTapReceived(){
        if let s = sticker{
            Analytics.shared.reportEvent(name: "Sticker Inserted", description: s.localizedDescription)
        }
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesBegan(touches, with: event)
        if let s = sticker{
            Analytics.shared.reportEvent(name: "Sticker Peeled", description: s.localizedDescription)
        }

    }
}

Usage:

let sv = CustomStickerView(frame: _stickerViewHolder.bounds, sticker: sticker)
sv.setupTapRecognizer()
_stickerViewHolder.addSubview(sv)
sv.startAnimating()