jsbridge实战2：Swift和h5的jsbridge通信

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demo1: 文本通信

h5 -> app

思路：

• h5 全局属性上挂一个变量
• app 接收这个变量的内容
• 关键API: navigation代理 + navigationAction.request.url?.absoluteString

// 这个变量挂载在 request 的 url 上 ，在浏览器实际无法运行，因此不会影响到页面本身
window.location.href="test://hellowolrd"
// app 接收这个变量
navigationAction.request.url?.absoluteString

import UIKit
import WebKit
class ViewController: UIViewController, WKUIDelegate {
    var webView: WKWebView!
    override func loadView() {
        let webConfiguration = WKWebViewConfiguration()
        webView = WKWebView(frame: .zero, configuration: webConfiguration)
        // 【1】设置自己为webview的代理
        webView.uiDelegate = self
        webView.navigationDelegate = self
        view = webView        
    }
    override func viewDidLoad() {
        super.viewDidLoad()
        let myURL = URL(string:"http://localhost:5173/") // ok
        let myRequest = URLRequest(url: myURL!)
        webView.load(myRequest)
        print("viewDidLoad...")
    }
}
extension ViewController: WKNavigationDelegate {
    //【2】通过 navigationAction.request.url?.absoluteString  获取 h5 传递的数据
    func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
        print("webView decidePolicyFor ...")
        print(navigationAction.request.url?.absoluteString)
        decisionHandler(.allow)
    }
}

app -> h5

思路

• app调用js语法，将app的数据通过 html dom结构或者js方法 传递给h5
• 关键API：webView.evaluateJavaScript

<div id="someElement1">test data1div>
<div id="someElement2">div>
<script>
    window.getText=function(data){
        const reuslt = 'test data2:'+data;
        document.getElementById('someElement2').innerText = reuslt;
        return reuslt; 
    }
script>

// app swift
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
    print("webView didFinish 页面加载完成之后调用...")
    webView.evaluateJavaScript("document.getElementById('someElement1').innerText='test data1: app'") {
        (result, error) in
        if let result = result {
            print("someElement result: \(result)")
        }
        if let error = error {
            print("someElement error: \(error)")
        }
    }
    webView.evaluateJavaScript("window.getText('app')") { (result, error) in
        if let result = result {
            print("getText result: \(result)")
        }
        if let error = error {
            print("getText error: \(error)")
        }
    }
}

demo2: h5通过app调用相机和扫描二维码

思路

• 原生app具备调用相机和扫描二维码的能力
• h5通过jsbridge通知app-》app执行拍照和扫描动作-》将结果返回h5