JS&Swift
載入本地HTML檔案
xoverride func loadView() { super.loadView() let conf = WKWebViewConfiguration() //JS呼叫HTML時使用的name conf.userContentController.add(self, name: "wkbridge") self.wk = WKWebView(frame: CGRect(x: 0, y:20, width: self.view.frame.size.width, height: self.view.frame.size.height - 20), configuration: conf) self.wk.navigationDelegate = self self.wk.uiDelegate = self if let path = Bundle.main.path(forResource: "index", ofType: "html", inDirectory: "www") { let fileUrl = URL(fileURLWithPath: path) self.wk.loadFileURL(fileUrl, allowingReadAccessTo: fileUrl) } //每個頁面注入 JS 外掛程式碼 (runPluginJS方法在下面) self.runPluginJS(names: ["Base", "Console", "Sandbox"]) //注入頁面間傳遞的引數 if pageParam != nil { self.wk.evaluateJavaScript("win.pageParam=\(pageParam!)", completionHandler: nil) } self.view.addSubview(self.wk) //新增一個等待指示器 self.view.backgroundColor = UIColor.white activityIndicator = UIActivityIndicatorView() activityIndicator.center = CGPoint(x: self.view.bounds.width/2, y: self.view.bounds.height/2) activityIndicator.color = UIColor.black activityIndicator.startAnimating() self.view.addSubview(activityIndicator)}//注入外掛檔案func runPluginJS(names: Array<String>) { for name in names { if let path = Bundle.main.path(forResource: name, ofType: "js") { do { let js = try NSString(contentsOfFile: path, encoding: String.Encoding.utf8.rawValue) self.wk.evaluateJavaScript(js as String, completionHandler: nil) } catch let error as NSError { print(error.debugDescription) } } }}
在專案根目錄中新建 www 資料夾(自定義) 放入 html js css 圖片 檔案,前端檔案都放在www中,方便管理
注意
將wkwebview需要訪問的本地檔案 新增到專案的 Bundle Resources
HTML 與 Native 互動
ViewController 實現 三個協議 WKNavigationDelegate, WKUIDelegate, WKScriptMessageHandler
JS呼叫Swift程式碼
js直接使用
xxxxxxxxxx // wkbridge為在WKWebViewConfiguration定定義的name // js傳遞的param使用json物件 ,比如類似{className: "Console", functionName: "log", data: {msg: "來自js的console"}} window.webkit.messageHandlers.wkbridge.postMessage(param);
會觸發swift方法
xxxxxxxxxxfunc userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) { if message.name == "wkbridge" { if let dic = message.body as? NSDictionary, let className = (dic["className"] as AnyObject).description, let functionName = (dic["functionName"] as AnyObject).description { if let cls = NSClassFromString((Bundle.main.object(forInfoDictionaryKey: "CFBundleName")! as AnyObject).description + "." + className) as? Plugin.Type{ let obj = cls.init() obj.viewController = self obj.wk = self.wk obj.taskId = (dic["taskId"] as AnyObject).integerValue obj.data = (dic["data"] as AnyObject) as? NSDictionary let functionSelector = Selector(functionName) if obj.responds(to: functionSelector) { obj.perform(functionSelector) } else { print("Undefined function :\(functionName)") } } else { print("Class Not Found: \(className)") } } }}
js的方法在 Xcode的控制檯列印內容
在swift新建類Console.swift
xxxxxxxxxximport UIKitclass Console: Plugin { func log() { if let string = self.data?["msg"] { print(string) } }}
這裡使用到一個基類 Plugin 用來處理 js 與 swift的互動
xxxxxxxxxximport UIKitimport WebKitclass Plugin: NSObject { var viewController: MeiWebView! var wk: WKWebView! var taskId: Int! var data: NSDictionary? required override init() { } func callback(values: NSDictionary) -> Bool { do { let jsonData = try JSONSerialization.data(withJSONObject: values, options: JSONSerialization.WritingOptions()) if let jsonString = NSString(data: jsonData, encoding: String.Encoding.utf8.rawValue) as? String, let tTaskId = self.taskId{ let js = "fireTask(\(tTaskId), '\(jsonString)');" self.wk.evaluateJavaScript(js, completionHandler: nil) return true } } catch let error as NSError{ NSLog(error.debugDescription) return false } return false } func errorCallback(errorMessage: String) { let js = "onError(\(self.taskId), '\(errorMessage)');" self.wk.evaluateJavaScript(js, completionHandler: nil) } func convertToDictionary(text: String) -> [String: Any]? { if let data = text.data(using: .utf8) { do { print(text) print(data) return try JSONSerialization.jsonObject(with: data, options: []) as? [String: Any] } catch { print("JSON 轉換失敗 :" + error.localizedDescription) } } return nil } }
這樣js的方法就會在 Xcode的控制檯列印出 內容了
對於隱藏介面,給前段一個友好的方式,使用自定義JS檔案,使用上面的runJSPlugin直接寫入到html中,在runJSPlugin 方法中 用到的js檔案, 在專案中新建一個GROUP 統一管理,我覺得與www資料夾中的前端檔案分離比較好。方法使用陣列傳遞需要寫入的JS的名稱,這裡列出Console.js
xxxxxxxxxxvar console = { log: function(message) { //console.log(msg); window.webkit.messageHandlers.wkbridge.postMessage({className: "Console", functionName: "log", data: {msg: message}}); }};
這樣在js中只要執行 console.log() 就可以在Xcode控制檯列印內容了。
Swift介面回撥
js 層使用佇列管理, 新建Base.js
xxxxxxxxxx Queue = [];function Task(id, callback, errorCallback) { var mTask = new Object; mTask.id = id; mTask.callback = callback; mTask.errorCallback = errorCallback; mTask.once = false; return mTask;}fireTask = function(i, j) { if (typeof Queue[i].callback == 'function') { Queue[i].callback(JSON.parse(j)); if (Queue[i].once) Queue[i] = null; } };onError = function (i, j) { Queue[i].errorCallback(j);};
實現獲取沙盒根目錄
Sandbox.swift
ximport UIKitclass Sandbox: Plugin { func getRootPath() { let path = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0] let dic = NSDictionary.init(object: path.absoluteString, forKey: "rootPath" as NSCopying) _ = callback(values: dic) }}
新建 Sandbox.js
xxxxxxxxxx Sandbox = { getRootPath: function(onSuccess, onError) { Queue.push(Task(Queue.length, onSuccess, onError)); window.webkit.messageHandlers.wkbridge.postMessage({className: "Finder", functionName: "getRootPath", taskId: Queue.length - 1}); },};
js中執行
xxxxxxxxxx Sandbox.getRootPath(function(path){ console.log(path.rootPath); //獲取沙盒路徑})
Swift呼叫JS程式碼
xxxxxxxxxxlet js = "jsFunction(param);"self.wk.evaluateJavaScript(js, completionHandler: nil)
訪問沙盒檔案
將檔案轉換成base64的字串傳遞給js, src直接設定data。
WKWebView 只能讀取tmp中的檔案,所以將檔案寫入到 NSTemporaryDirectory() 的路徑下面就可以了,以後js需要訪問什麼檔案,將檔案複製到tmp資料夾就可以訪問了,按需刪除就好了。
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