ios - Twilio videoView 委托(delegate)未调用

Question

我正在使用twilio框架来开发视频通信。并基于Twilio的视频快速入门我修改了一些TwilioVideoView的呈现方式。

我正在使用一个继承 UIView 类的类，名为“myView”，该类有一个 TVIVideoView 的实例属性。然后我将“myView”符合 TVIVideoViewDelegate 的协议(protocol)，希望得到一些回调，但我失败了即使我可以成功在 myView 上显示远程对等点的视频，也可以获得回调。

根据TVIVideoView的评论说:

delegate An object implementing the TVIVideoViewDelegate protocol (often a UIViewController).

这是否意味着我无法使自定义类符合 TVIVideoViewDelegate？

这是我的View类:

open class myView: UIView {
    private var tviVideoView: TVIVideoView?
    public var myViewDelegate: MyViewDelegate?

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

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

    public init(frame: CGRect, myViewDelegate: MyViewDelegate? = nil) {
        super.init(frame: frame)
        self.tviVideoView = TVIVideoView.init(frame: self.frame, delegate: self)
        self.myViewDelegate = myViewDelegate
        self.tviVideoView?.translatesAutoresizingMaskIntoConstraints = false
        tviVideoView?.contentMode = .scaleAspectFill
        self.addSubview(self.tviVideoView!)
        self.backgroundColor = UIColor.blue
    }
}

extension myView: TVIVideoViewDelegate {
    func videoView(_ view: TVIVideoView, videoDimensionsDidChange dimensions: CMVideoDimensions) {
        DispatchQueue.main.async {
            print("dimensions: \(dimensions.width), \(dimensions.height)")
            self.myViewDelegate?.videoView(self, videoDimensionDidChange: dimensions)
        }
    }
}

public protocol MyViewDelegate {
    func videoView(_ view: UIView, videoDimensionDidChange dimensions: CMVideoDimensions)
}

Answer 1

我找到了一个解决方法:我创建一个继承 TVIVideoViewDelegate 的类并将其指定为 TVIVideoView 的委托(delegate)。它起作用了!但我还是不知道为什么？

我的代码如下:

open class myView: UIView {
    private var tviVideoView: TVIVideoView?
    public var myViewDelegate: MyViewDelegate? {
        didSet {
            self.delegatorOfTVIView?.myViewDelegate = myViewDelegate
        }
    }

    var delegatorOfTVIView: DelegatorOfTVIVideoViewDelegate?

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

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

    public init(frame: CGRect, myViewDelegate: MyViewDelegate? = nil) {
        super.init(frame: frame)
        self.delegatorOfTVIView =  DelegatorOfTVIVideoViewDelegate(myDelegate: myViewDelegate)
        self.myViewDelegate = myViewDelegate
        self.tviVideoView = TVIVideoView.init(frame: self.frame, delegate: delegatorOfTVIView)

        self.tviVideoView?.translatesAutoresizingMaskIntoConstraints = false
        tviVideoView?.contentMode = .scaleAspectFill
        self.addSubview(self.tviVideoView!)
        self.backgroundColor = UIColor.blue
    }
}


public protocol MyViewDelegate {
    func videoView(_ view: UIView, videoDimensionDidChange dimensions: CMVideoDimensions)
}

class DelegatorOfTVIVideoViewDelegate: NSObject, TVIVideoViewDelegate {
    var myViewDelegate: MyViewDelegate?

    init(myDelegate: MyViewDelegate? = nil) {
        super.init()
        self.myViewDelegate = myDelegate
    }

    func videoView(_ view: TVIVideoView, videoDimensionsDidChange dimensions: CMVideoDimensions) {
        print("TVIVideoDelegate call dimension change")
        self.myViewDelegate?.videoView(view, videoDimensionDidChange: dimensions)
    }
}