iOS 10 iMessage贴纸应用中的MSSticker Peels回调 [英] Callback for MSSticker Peels in iOS 10 iMessage sticker app

问题描述

我正在尝试在iOS 10中使用iMessage贴纸应用程序，并且在 MSMessagesAppViewController中使用 override func didStartSending(_ message:MSMessage，对话:MSConversation)方法遇到问题.当从 MSStickerView 中剥离"标签时，我希望在 didStartSending 方法上收到某种回调.但是看来情况并非如此.有谁知道这是否是预期的行为，或者是否有其他方法可以将这些标签剥离，拖动并放到 MSConversation 中时订阅回调?我意识到 didStartSending 是为用户在单击发送按钮时保留的，但肯定应该有某种方式来知道用户何时拖动MSStickers，而不会一起破坏某些UIView的拖动/校正.阅读启发式.

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: MSConversation) method in MSMessagesAppViewController. When "peeling" a sticker from an MSStickerView, I would expect to receive some sort of callback on the didStartSending method. But it appears this is not the case. Does anyone know if this is the expected behavior and/or if there's another way to subscribe to callbacks for when these stickers are peeled, dragged, and dropped into the MSConversation? I realize that didStartSending is reserved for when the user taps the send button, but surely there should be some way of knowing when users drag MSStickers without hacking together some UIView dragging/rect-reading heuristic.

消息视图控制器:

class MessagesViewController: MSMessagesAppViewController {

    var nYCStickersBroswerViewController: NYCStickersBroswerViewController!

    override func viewDidLoad() {
        super.viewDidLoad()
        nYCStickersBroswerViewController = NYCStickersBroswerViewController(stickerSize: .regular)
        nYCStickersBroswerViewController.view.frame = self.view.frame

        self.addChildViewController(nYCStickersBroswerViewController)
        nYCStickersBroswerViewController.didMove(toParentViewController: self)
        self.view.addSubview(nYCStickersBroswerViewController.view)

        nYCStickersBroswerViewController.loadStickers()
        nYCStickersBroswerViewController.stickerBrowserView.reloadData()
    }

    ...

    override func didStartSending(_ message: MSMessage, conversation: MSConversation) {
        // Called when the user taps the send button.
        print(message) // should this not contain the sticker that is peeled, dragged, and dropped into the conversation?
    }

 }

贴纸浏览器:

import Foundation
import UIKit
import Messages

class ASSticker: MSSticker {
    var identifier: String?
}

class NYCStickersBroswerViewController: MSStickerBrowserViewController {

    var stickers = [ASSticker]()

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    func changeBrowswerViewBackgroundColor(color: UIColor) {
        stickerBrowserView.backgroundColor = color
    }

    func loadStickers() {
        createSticker(name: "brooklyn", localizedDescription: "Brooklyn Bridge Sticker")
        createSticker(name: "liberty", localizedDescription: "Statue of Liberty Sticker")
        createSticker(name: "love", localizedDescription: "I Love New York Sticker")
        createSticker(name: "mets", localizedDescription: "New York Mets Sticker")
        createSticker(name: "rangers", localizedDescription: "New York Rangers Sticker")
        createSticker(name: "subway", localizedDescription: "New York City MTA Subway Train Sticker")
    }

    func createSticker(name: String, localizedDescription: String) {
        guard let stickerPath = Bundle.main.pathForResource(name, ofType: "png") else {
            print("Call ae cab, you're intoxicated.")
            return
        }
        let stickerURL = URL(fileURLWithPath: stickerPath)
        let sticker: ASSticker
        do {
            try sticker = ASSticker(contentsOfFileURL: stickerURL, localizedDescription: localizedDescription)
            sticker.identifier = "something unique"
            stickers.append(sticker)
        } catch {
            print("Call a cab, you're intoxicated.")
        }
    }

    override func numberOfStickers(in stickerBrowserView: MSStickerBrowserView) -> Int {
        return self.stickers.count
    }
    override func stickerBrowserView(_ stickerBrowserView: MSStickerBrowserView, stickerAt index: Int) -> MSSticker {
        return self.stickers[index]
    }

}

推荐答案

这里是一个子类和委托，它将绑定到 MSStickerView 用于选择和剥离交互的轻击和长按手势识别器中.如果 MSStickerView 的实现更改，它可能不再提供事件，但不应崩溃.

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)
        }
    }
}

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