Swift 无法将新参数传递给`NSView`的`init``

在下面的代码中，我试图将一个附加参数传递给

VidePlayerView

。现在，我正在创建一个

VideoPlayerView

的实例，并且没有向它传递任何参数。但是，这最终会调用带有

NSRect

参数的

init

方法（我真的不知道这是从哪里来的）

我想向

VideoPlayerView

传递一个附加参数，但我不知道该怎么做，因为我似乎无法访问

frame

参数

import SwiftUI
import AVKit

// Note: I couldn't find a way to pass this through the `init` method
var playerLayer = AVCaptureVideoPreviewLayer()

final class VideoPlayerView: NSView {

    // MARK: - Initializers
    override public init(frame frameRect: NSRect) {
        super.init(frame: frameRect)
        commonInit()
    }

    required public init?(coder decoder: NSCoder) {
        super.init(coder: decoder)
        commonInit()
    }

    private func commonInit() {
        // Do something with playerLayer
    }
}

public struct VideoPlayerViewView: NSViewRepresentable {

    init(layer: AVCaptureVideoPreviewLayer?) {
        if let layer = layer {
            playerLayer = layer
        } else {
            print("No Layer Set")
        }

    }

    public func makeNSView(context: NSViewRepresentableContext<VideoPlayerViewView>) -> NSView {
        return VideoPlayerView()
    }
}

---

以下是可能的方法。使用Xcode 11.4进行测试

final class VideoPlayerView: NSView {
    private var playerLayer: AVCaptureVideoPreviewLayer?

    // MARK: - Initializers
    override public init(frame frameRect: NSRect) {
        super.init(frame: frameRect)
        commonInit()
    }

    public convenience init(frame frameRect: NSRect = .zero, layer: AVCaptureVideoPreviewLayer?) {
        self.init(frame: frameRect)
        self.playerLayer = layer
    }

    required public init?(coder decoder: NSCoder) {
        super.init(coder: decoder)
        commonInit()
    }

    private func commonInit() {
        // Do something with playerLayer
    }
}

public struct VideoPlayerViewView: NSViewRepresentable {

    init(layer: AVCaptureVideoPreviewLayer?) {
        if let layer = layer {
            playerLayer = layer
        } else {
            print("No Layer Set")
        }

    }

    public func makeNSView(context: NSViewRepresentableContext<VideoPlayerViewView>) -> NSView {
        return VideoPlayerView(layer: playerLayer)
    }

    public func updateNSView(_ nsView: NSView, context: Context) {
    }
}

final class VideoPlayerView:NSView{
私人var播放器：AVCaptureVideoPreviewLayer？
//马克：初始化者
重写公共初始化（frame-frameRect:NSRect）{
super.init（frame:frameRect）
commonInit（）
}
公共便利初始化（frame-frameRect:NSRect=.zero，层：AVCaptureVideoPreviewLayer？）{
self.init（frame:frameRect）
self.playerLayer=层
}
必需的公共初始化？（编码器-解码器：NSCoder）{
super.init（编码器：解码器）
commonInit（）
}
私有函数commonInit（）{
//对playerLayer做些什么
}
}
公共结构VideoPlayerViewView:NSViewRepresentable{
初始化（层：AVCaptureVideoPreviewLayer？）{
如果let layer=layer{
playerLayer=层
}否则{
打印（“未设置图层”）
}
}
public func makeNSView（上下文：NSViewRepresentableContext）->NSView{
返回VideoPlayerView（图层：playerLayer）
}
public func updateNSView（unsview:nsView，context:context）{
}
}

您不能使用相关层的边界吗？

final class VideoPlayerView: NSView {
    private var playerLayer: AVCaptureVideoPreviewLayer?

    // MARK: - Initializers
    override public init(frame frameRect: NSRect) {
        super.init(frame: frameRect)
        commonInit()
    }

    public convenience init(frame frameRect: NSRect = .zero, layer: AVCaptureVideoPreviewLayer?) {
        self.init(frame: frameRect)
        self.playerLayer = layer
    }

    required public init?(coder decoder: NSCoder) {
        super.init(coder: decoder)
        commonInit()
    }

    private func commonInit() {
        // Do something with playerLayer
    }
}

public struct VideoPlayerViewView: NSViewRepresentable {

    init(layer: AVCaptureVideoPreviewLayer?) {
        if let layer = layer {
            playerLayer = layer
        } else {
            print("No Layer Set")
        }

    }

    public func makeNSView(context: NSViewRepresentableContext<VideoPlayerViewView>) -> NSView {
        return VideoPlayerView(layer: playerLayer)
    }

    public func updateNSView(_ nsView: NSView, context: Context) {
    }
}