//

// ViewController.swift

// SwiftJavaScriptCore

//

// Created by myl on 16/6/8.

// Copyright © 2016年 Mayanlong. All rights reserved.

//

import UIKit

import JavaScriptCore

// 定义协议SwiftJavaScriptDelegate 该协议必须遵守JSExport协议

@objc protocol SwiftJavaScriptDelegate: JSExport {

// js调用App的微信支付功能 演示最基本的用法

func wxPay(_ orderNo: String)

// js调用App的微信分享功能 演示字典参数的使用

func wxShare(_ dict: [String: AnyObject])

// js调用App方法时传递多个参数 并弹出对话框 注意js调用时的函数名

func showDialog(_ title: String, message: String)

// js调用App的功能后 App再调用js函数执行回调

func callHandler(_ handleFuncName: String)

}

// 定义一个模型 该模型实现SwiftJavaScriptDelegate协议

@objc class SwiftJavaScriptModel: NSObject, SwiftJavaScriptDelegate {

weak var controller: UIViewController?

weak var jsContext: JSContext?

func wxPay(_ orderNo: String) {

print("订单号：", orderNo)

// 调起微信支付逻辑

}

func wxShare(_ dict: [String: AnyObject]) {

print("分享信息：", dict)

// 调起微信分享逻辑

}

func showDialog(_ title: String, message: String) {

let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)

alert.addAction(UIAlertAction(title: "确定", style: .default, handler: nil))

self.controller?.present(alert, animated: true, completion: nil)

}

func callHandler(_ handleFuncName: String) {

let jsHandlerFunc = self.jsContext?.objectForKeyedSubscript("\(handleFuncName)")

let dict = ["name": "sean", "age": 18] as [String : Any]

let _ = jsHandlerFunc?.call(withArguments: [dict])

}

}

class ViewController: UIViewController, UIWebViewDelegate {

var webView: UIWebView!

var jsContext: JSContext!

override func viewDidLoad() {

super.viewDidLoad()

testJSContext()

addWebView()

}

func testJSContext() {

// 通过JSContext执行js代码

let context: JSContext = JSContext()

let result1: JSValue = context.evaluateScript("1 + 3")

print(result1) // 输出4

// 定义js变量和函数

context.evaluateScript("var num1 = 10; var num2 = 20;")

context.evaluateScript("function sum(param1, param2) { return param1 + param2; }")

// 通过js方法名调用方法

let result2 = context.evaluateScript("sum(num1, num2)")

print(result2 as AnyObject) // 输出30

// 通过下标来获取js方法并调用方法

let squareFunc = context.objectForKeyedSubscript("sum")

let result3 = squareFunc?.call(withArguments: [10, 20]).toString()

print(result3 as AnyObject) // 输出30

}

func addWebView() {

self.webView = UIWebView(frame: self.view.bounds)

self.view.addSubview(self.webView)

self.webView.delegate = self

self.webView.scalesPageToFit = true

// 加载本地Html页面

let url = Bundle.main.url(forResource: "demo", withExtension: "html")

let request = URLRequest(url: url!)

// 加载网络Html页面 请设置允许Http请求

//let url = NSURL(string: "http://www.mayanlong.com");

//let request = NSURLRequest(URL: url!)

self.webView.loadRequest(request)

}

func webViewDidFinishLoad(_ webView: UIWebView) {

self.jsContext = webView.value(forKeyPath: "documentView.webView.mainFrame.javaScriptContext") as! JSContext

let model = SwiftJavaScriptModel()

model.controller = self

model.jsContext = self.jsContext

// 这一步是将SwiftJavaScriptModel模型注入到JS中，在JS就可以通过WebViewJavascriptBridge调用我们暴露的方法了。

self.jsContext.setObject(model, forKeyedSubscript: "WebViewJavascriptBridge" as NSCopying & NSObjectProtocol)

// 注册到本地的Html页面中

let url = Bundle.main.url(forResource: "demo", withExtension: "html")

self.jsContext.evaluateScript(try? String(contentsOf: url!, encoding: String.Encoding.utf8))

// 注册到网络Html页面 请设置允许Http请求

//let url = "http://www.mayanlong.com";

//let curUrl = self.webView.request?.URL?.absoluteString //WebView当前访问页面的链接 可动态注册

//self.jsContext.evaluateScript(try? String(contentsOfURL: NSURL(string: url)!, encoding: NSUTF8StringEncoding))

self.jsContext.exceptionHandler = { (context, exception) in

print("exception：", exception as Any)

}

}

override func didReceiveMemoryWarning() {

super.didReceiveMemoryWarning()

}

}