Flutter使用iOS原生控件

第一步，创建一个平台View（继承FlutterPlatformView）

import WebKit
import Flutter

class MyWKWebView: NSObject, FlutterPlatformView {
    private var webView: WKWebView
    private var frame: CGRect

    init(frame: CGRect, viewIdentifier id: Int64, args: Any?, messenger: FlutterBinaryMessenger) {
        self.frame = frame
        webView = WKWebView(frame: frame)
        super.init()
        
        if let dict = args as? Dictionary<String, Any>,
            let urlString = dict["url"] as? String,
            let url = URL(string: urlString) {
            webView.load(URLRequest(url: url))
        }
    }

    func view() -> UIView {
        return webView
    }
}

第二步，创建一个工厂类（继承FlutterPlatformViewFactory）

import UIKit
import Flutter

class MyWKWebViewFactory: NSObject, FlutterPlatformViewFactory {
    private var messenger: FlutterBinaryMessenger

    init(messenger: FlutterBinaryMessenger) {
        self.messenger = messenger
        super.init()
    }

    func create(
        withFrame frame: CGRect,
        viewIdentifier viewId: Int64,
        arguments args: Any?
    ) -> FlutterPlatformView {
        print("aaa111", args)
        return MyWKWebView(frame: frame, viewIdentifier: viewId, args: args, messenger: messenger)
    }
    
    // 必须实现这个方法，create才能接受参数
    func createArgsCodec() -> FlutterMessageCodec & NSObjectProtocol {
        return FlutterStandardMessageCodec.sharedInstance()
    }
}

里面有一个坑，就是Flutter给UIView传递参数时，需要实现createArgsCodec方法，否则无法接受到参数

参考文章：Flutter插件开发踩坑记