JS&Swift相互交互

1. 加载本地HTML文件

x

override func loadView() {

    super.loadView()

    let conf = WKWebViewConfiguration()

  //JS调用HTML时使用的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)

    }

    //每个页面注入 JS 插件代码 (runPluginJS方法在下面)

    self.runPluginJS(names: ["Base", "Console", "Sandbox"])

    //注入页面间传递的参数

    if pageParam != nil {

        self.wk.evaluateJavaScript("win.pageParam=\(pageParam!)", completionHandler: nil)

    }

    self.view.addSubview(self.wk)

    //添加一个等待指示器

    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)

}

​

//注入插件文件

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)

            }

        }

    }

}

​

在项目根目录中新建 www 文件夹（自定义） 放入 html js css 图片 文件，前端文件都放在www中，方便管理

注意

将wkwebview需要访问的本地文件 添加到项目的 Bundle Resources

1. HTML 与 Native 交互

ViewController 实现 三个协议 WKNavigationDelegate, WKUIDelegate, WKScriptMessageHandler

• JS调用Swift代码

  js直接使用

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// wkbridge为在WKWebViewConfiguration定定义的name

// js传递的param使用json对象 ，比如类似{className: "Console", functionName: "log", data: {msg: "来自js的console"}}

window.webkit.messageHandlers.wkbridge.postMessage(param);

会触发swift方法

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func 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的控制台打印内容

在swift新建类Console.swift

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import UIKit

​

class Console: Plugin {

    func log() {

        if let string = self.data?["msg"] {

            print(string)

        }

    }

}

​

这里使用到一个基类 Plugin 用来处理 js 与 swift的交互

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import UIKit

import WebKit

​

class 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 转换失败 :" + error.localizedDescription)

            }

        }

        return nil

    }   

}

这样js的方法就会在 Xcode的控制台打印出 内容了

对于隐藏接口，给前段一个友好的方式，使用自定义JS文件，使用上面的runJSPlugin直接写入到html中，在runJSPlugin 方法中 用到的js文件， 在项目中新建一个GROUP 统一管理，我觉得与www文件夹中的前端文件分离比较好。方法使用数组传递需要写入的JS的名称，这里列出Console.js

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var console = {

    log: function(message) { //console.log(msg);

        window.webkit.messageHandlers.wkbridge.postMessage({className: "Console", functionName: "log", data: {msg: message}});

    }

};

这样在js中只要执行 console.log() 就可以在Xcode控制台打印内容了。

• Swift接口回调

js 层使用队列管理， 新建Base.js

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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);

};

​

• 实现获取沙盒根目录

  Sandbox.swift

x

import UIKit

​

class 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

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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中执行

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Sandbox.getRootPath(function(path){

    console.log(path.rootPath); //获取沙盒路径

})

• Swift调用JS代码

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let js = "jsFunction(param);"

self.wk.evaluateJavaScript(js, completionHandler: nil)

1. 访问沙盒文件

• 将文件转换成base64的字符串传递给js， src直接设置data。
• WKWebView 只能读取tmp中的文件，所以将文件写入到 NSTemporaryDirectory() 的路径下面就可以了，以后js需要访问什么文件，将文件复制到tmp文件夹就可以访问了，按需删除就好了。

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html { font-size: 14px; background-color: var(–bg-color); color: var(–text-color); font-family: “Helvetica Neue”, Helvetica, Arial, sans-serif; -webkit-font-smoothing: antialiased }
body { margin: 0; padding: 0; height: auto; bottom: 0; top: 0; left: 0; right: 0; font-size: 1rem; line-height: 1.42857143; overflow-x: hidden; background-image: inherit; background-size: inherit; background-attachment: inherit; background-origin: inherit; background-clip: inherit; background-color: inherit; tab-size: 4 }
iframe { margin: auto }
a.url { word-break: break-all }
a:active, a:hover { outline: 0 }
.in-text-selection, ::selection { text-shadow: none; background: var(–select-text-bg-color); color: var(–select-text-font-color) }
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button, input, select, textarea { color: inherit; font-family: inherit; font-size: inherit; font-style: inherit; font-variant-caps: inherit; font-weight: inherit; font-stretch: inherit; line-height: inherit }
input[type=”checkbox”], input[type=”radio”] { line-height: normal; padding: 0 }
*, ::after, ::before { box-sizing: border-box }
#write h1, #write h2, #write h3, #write h4, #write h5, #write h6, #write p, #write pre { width: inherit }
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p { line-height: inherit }
h1, h2, h3, h4, h5, h6 { break-after: avoid-page; break-inside: avoid; orphans: 4 }
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a { cursor: pointer }
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#write input[type=”checkbox”] { cursor: pointer; width: inherit; height: inherit }
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tr { break-inside: avoid; break-after: auto }
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.CodeMirror-gutters { margin-right: 4px }
.md-fences { font-size: 0.9rem; display: block; break-inside: avoid; text-align: left; overflow: visible; white-space: pre; background-image: inherit; background-size: inherit; background-attachment: inherit; background-origin: inherit; background-clip: inherit; background-color: inherit; position: relative !important }
.md-diagram-panel { width: 100%; margin-top: 10px; text-align: center; padding-top: 0; padding-bottom: 8px; overflow-x: auto }
#write .md-fences.mock-cm { white-space: pre-wrap }
.md-fences.md-fences-with-lineno { padding-left: 0 }
#write.fences-no-line-wrapping .md-fences.mock-cm { white-space: pre; overflow-x: auto }
.md-fences.mock-cm.md-fences-with-lineno { padding-left: 8px }
.CodeMirror-line, twitterwidget { break-inside: avoid }
.footnotes { opacity: 0.8; font-size: 0.9rem; margin-top: 1em; margin-bottom: 1em }
.footnotes+.footnotes { margin-top: 0 }
.md-reset { margin: 0; padding: 0; border: 0; outline: 0; vertical-align: top; text-decoration: none; text-shadow: none; float: none; position: static; width: auto; height: auto; white-space: nowrap; cursor: inherit; line-height: normal; font-weight: 400; text-align: left; box-sizing: content-box; direction: ltr; background-position: left top }
li div { padding-top: 0 }
blockquote { margin: 1rem 0 }
li .mathjax-block, li p { margin: 0.5rem 0 }
li { margin: 0; position: relative }
blockquote>:last-child { margin-bottom: 0 }
blockquote>:first-child, li>:first-child { margin-top: 0 }
.footnotes-area { color: rgba(136, 136, 136, 1); margin-top: 0.714rem; padding-bottom: 0.143rem; white-space: normal }
#write .footnote-line { white-space: pre-wrap }
@media print { body, html { border: 1px solid rgba(0, 0, 0, 0); height: 99%; break-after: avoid; break-before: avoid; font-variant-ligatures: no-common-ligatures } #write { margin-top: 0; padding-top: 0; border-color: rgba(0, 0, 0, 0) !important } .typora-export * { -webkit-print-color-adjust: exact } html.blink-to-pdf { font-size: 13px } .typora-export #write { break-after: avoid } .typora-export #write::after { height: 0 } .is-mac table { break-inside: avoid } }
.footnote-line { margin-top: 0.714em; font-size: 0.7em }
a img, img a { cursor: pointer }
pre.md-meta-block { font-size: 0.8rem; min-height: 0.8rem; white-space: pre-wrap; background-color: rgba(204, 204, 204, 1); display: block; overflow-x: hidden }
p>.md-image:only-child:not(.md-img-error) img, p>img:only-child { display: block; margin: auto }
#write.first-line-indent p>.md-image:only-child:not(.md-img-error) img { left: -2em; position: relative }
p>.md-image:only-child { display: inline-block; width: 100% }
#write .MathJax_Display { margin: 0.8em 0 0 }
.md-math-block { width: 100% }
.md-math-block:not(:empty)::after { display: none }
[contenteditable=”true”]:active, [contenteditable=”true”]:focus, [contenteditable=”false”]:active, [contenteditable=”false”]:focus { outline: 0; box-shadow: none }
.md-task-list-item { position: relative; list-style-type: none }
.task-list-item.md-task-list-item { padding-left: 0 }
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.math { font-size: 1rem }
.md-toc { min-height: 3.58rem; position: relative; font-size: 0.9rem; border-radius: 10px }
.md-toc-content { position: relative; margin-left: 0 }
.md-toc-content::after, .md-toc::after { display: none }
.md-toc-item { display: block; color: rgba(65, 131, 196, 1) }
.md-toc-item a { text-decoration: none }
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.md-toc-inner { display: inline-block; cursor: pointer }
.md-toc-h1 .md-toc-inner { margin-left: 0; font-weight: 700 }
.md-toc-h2 .md-toc-inner { margin-left: 2em }
.md-toc-h3 .md-toc-inner { margin-left: 4em }
.md-toc-h4 .md-toc-inner { margin-left: 6em }
.md-toc-h5 .md-toc-inner { margin-left: 8em }
.md-toc-h6 .md-toc-inner { margin-left: 10em }
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a.md-toc-inner { font-size: inherit; font-style: inherit; font-weight: inherit; line-height: inherit }
.footnote-line a:not(.reversefootnote) { color: inherit }
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.MathJax_SVG .MJX-monospace { font-family: var(–monospace) }
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.cm-s-inner .cm-def { color: rgba(0, 0, 255, 1) }
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.cm-s-inner .cm-quote, .cm-s-inner.cm-quote { color: rgba(0, 153, 0, 1) }
.cm-s-inner .cm-hr, .cm-s-inner.cm-hr { color: rgba(153, 153, 153, 1) }
.cm-s-inner .cm-link, .cm-s-inner.cm-link { color: rgba(0, 0, 204, 1) }
.cm-negative { color: rgba(221, 68, 68, 1) }
.cm-positive { color: rgba(34, 153, 34, 1) }
.cm-header, .cm-strong { font-weight: 700 }
.cm-del { text-decoration: line-through }
.cm-em { font-style: italic }
.cm-link { text-decoration: underline }
.cm-error { color: rgba(255, 0, 0, 1) }
.cm-invalidchar { color: rgba(255, 0, 0, 1) }
.cm-constant { color: rgba(38, 139, 210, 1) }
.cm-defined { color: rgba(181, 137, 0, 1) }
div.CodeMirror span.CodeMirror-matchingbracket { color: rgba(0, 255, 0, 1) }
div.CodeMirror span.CodeMirror-nonmatchingbracket { color: rgba(255, 34, 34, 1) }
.cm-s-inner .CodeMirror-activeline-background { background-image: inherit; background-size: inherit; background-attachment: inherit; background-origin: inherit; background-clip: inherit; background-color: inherit }
.CodeMirror { position: relative; overflow: hidden }
.CodeMirror-scroll { height: 100%; outline: 0; position: relative; box-sizing: content-box; background-image: inherit; background-size: inherit; background-attachment: inherit; background-origin: inherit; background-clip: inherit; background-color: inherit }
.CodeMirror-sizer { position: relative }
.CodeMirror-gutter-filler, .CodeMirror-hscrollbar, .CodeMirror-scrollbar-filler, .CodeMirror-vscrollbar { position: absolute; z-index: 6; display: none }
.CodeMirror-vscrollbar { right: 0; top: 0; overflow: hidden }
.CodeMirror-hscrollbar { bottom: 0; left: 0; overflow: hidden }
.CodeMirror-scrollbar-filler { right: 0; bottom: 0 }
.CodeMirror-gutter-filler { left: 0; bottom: 0 }
.CodeMirror-gutters { position: absolute; left: 0; top: 0; padding-bottom: 30px; z-index: 3 }
.CodeMirror-gutter { white-space: normal; height: 100%; box-sizing: content-box; padding-bottom: 30px; margin-bottom: -32px; display: inline-block }
.CodeMirror-gutter-wrapper { position: absolute; z-index: 4; border: none !important; background-position: left top !important }
.CodeMirror-gutter-background { position: absolute; top: 0; bottom: 0; z-index: 4 }
.CodeMirror-gutter-elt { position: absolute; cursor: default; z-index: 4 }
.CodeMirror-lines { cursor: text }
.CodeMirror pre { border-radius: 0; border-width: 0; font-family: inherit; font-size: inherit; margin: 0; white-space: pre; word-wrap: normal; color: inherit; z-index: 2; position: relative; overflow: visible; background-position: left top }
.CodeMirror-wrap pre { word-wrap: break-word; white-space: pre-wrap; word-break: normal }
.CodeMirror-code pre { border-right: 30px solid rgba(0, 0, 0, 0) }
.CodeMirror-wrap .CodeMirror-code pre { border-right-style: none; width: auto }
.CodeMirror-linebackground { position: absolute; left: 0; right: 0; top: 0; bottom: 0; z-index: 0 }
.CodeMirror-linewidget { position: relative; z-index: 2; overflow: auto }
.CodeMirror-wrap .CodeMirror-scroll { overflow-x: hidden }
.CodeMirror-measure { position: absolute; width: 100%; height: 0; overflow: hidden; visibility: hidden }
.CodeMirror-measure pre { position: static }
.CodeMirror div.CodeMirror-cursor { position: absolute; visibility: hidden; border-right-style: none; width: 0 }
.CodeMirror div.CodeMirror-cursor { visibility: hidden }
.CodeMirror-focused div.CodeMirror-cursor { visibility: inherit }
.cm-searching { background-color: rgba(255, 255, 0, 0.4) }
@media print { .CodeMirror div.CodeMirror-cursor { visibility: hidden } }
:root { –side-bar-bg-color: #fafafa; –control-text-color: #777 }
@include-when-export url(https://fonts.loli.net/css?family=Open+Sans:400italic,700italic,700,400&subset=latin,latin-ext);
html { font-size: 16px }
body { font-family: “Open Sans”, “Clear Sans”, “Helvetica Neue”, Helvetica, Arial, sans-serif; color: rgba(51, 51, 51, 1); line-height: 1.6 }
#write { max-width: 860px; margin: 0 auto; padding: 30px 30px 100px }
@media only screen and (min-width: 1400px) { #write { max-width: 1024px } }
@media only screen and (min-width: 1800px) { #write { max-width: 1200px } }
#write>ul:first-child, #write>ol:first-child { margin-top: 30px }
a { color: rgba(65, 131, 196, 1) }
h1, h2, h3, h4, h5, h6 { position: relative; margin-top: 1rem; margin-bottom: 1rem; font-weight: bold; line-height: 1.4; cursor: text }
h1:hover a.anchor, h2:hover a.anchor, h3:hover a.anchor, h4:hover a.anchor, h5:hover a.anchor, h6:hover a.anchor { text-decoration: none }
h1 tt, h1 code { font-size: inherit }
h2 tt, h2 code { font-size: inherit }
h3 tt, h3 code { font-size: inherit }
h4 tt, h4 code { font-size: inherit }
h5 tt, h5 code { font-size: inherit }
h6 tt, h6 code { font-size: inherit }
h1 { font-size: 2.25em; line-height: 1.2; border-bottom: 1px solid rgba(238, 238, 238, 1) }
h2 { font-size: 1.75em; line-height: 1.225; border-bottom: 1px solid rgba(238, 238, 238, 1) }
h3 { font-size: 1.5em; line-height: 1.43 }
h4 { font-size: 1.25em }
h5 { font-size: 1em }
h6 { font-size: 1em; color: rgba(119, 119, 119, 1) }
p, blockquote, ul, ol, dl, table { margin: 0.8em 0 }
li>ol, li>ul { margin: 0 }
hr { height: 2px; padding: 0; margin: 16px 0; background-color: rgba(231, 231, 231, 1); border: 0 none; overflow: hidden; box-sizing: content-box }
li p.first { display: inline-block }
ul, ol { padding-left: 30px }
ul:first-child, ol:first-child { margin-top: 0 }
ul:last-child, ol:last-child { margin-bottom: 0 }
blockquote { border-left: 4px solid rgba(223, 226, 229, 1); padding: 0 15px; color: rgba(119, 119, 119, 1) }
blockquote blockquote { padding-right: 0 }
table { padding: 0; word-break: initial }
table tr { border-top: 1px solid rgba(223, 226, 229, 1); margin: 0; padding: 0 }
table tr:nth-child(2n), thead { background-color: rgba(248, 248, 248, 1) }
table tr th { font-weight: bold; border-top: 1px solid rgba(223, 226, 229, 1); border-right: 1px solid rgba(223, 226, 229, 1); border-bottom: 0; border-left: 1px solid rgba(223, 226, 229, 1); margin: 0; padding: 6px 13px }
table tr td { border: 1px solid rgba(223, 226, 229, 1); margin: 0; padding: 6px 13px }
table tr th:first-child, table tr td:first-child { margin-top: 0 }
table tr th:last-child, table tr td:last-child { margin-bottom: 0 }
.CodeMirror-lines { padding-left: 4px }
.code-tooltip { box-shadow: 0 1px 1px rgba(0, 28, 36, 0.3); border-top: 1px solid rgba(238, 242, 242, 1) }
.md-fences, code, tt { border: 1px solid rgba(231, 234, 237, 1); background-color: rgba(248, 248, 248, 1); border-radius: 3px; padding: 2px 4px 0; font-size: 0.9em }
code { background-color: rgba(243, 244, 244, 1); padding: 0 2px }
.md-fences { margin-bottom: 15px; margin-top: 15px; padding-top: 8px; padding-bottom: 6px }
.md-task-list-item>input { margin-left: -1.3em }
@media print { html { font-size: 13px } table, pre { page-break-inside: avoid } pre { word-wrap: break-word } }
.md-fences { background-color: rgba(248, 248, 248, 1) }
#write pre.md-meta-block { padding: 1rem; font-size: 85%; line-height: 1.45; background-color: rgba(247, 247, 247, 1); border: 0; border-radius: 3px; color: rgba(119, 119, 119, 1); margin-top: 0 !important }
.mathjax-block>.code-tooltip { bottom: 0.375rem }
.md-mathjax-midline { background: rgba(250, 250, 250, 1) }
#write>h3.md-focus:before { left: -1.5625rem; top: 0.375rem }
#write>h4.md-focus:before { left: -1.5625rem; top: 0.285714286rem }
#write>h5.md-focus:before { left: -1.5625rem; top: 0.285714286rem }
#write>h6.md-focus:before { left: -1.5625rem; top: 0.285714286rem }
.md-image>.md-meta { border-radius: 3px; padding: 2px 0 0 4px; font-size: 0.9em; color: inherit }
.md-tag { color: rgba(167, 167, 167, 1); opacity: 1 }
.md-toc { margin-top: 20px; padding-bottom: 20px }
.sidebar-tabs { border-bottom: none }
#typora-quick-open { border: 1px solid rgba(221, 221, 221, 1); background-color: rgba(248, 248, 248, 1) }
#typora-quick-open-item { background-color: rgba(250, 250, 250, 1); border-top: 1px solid rgba(254, 254, 254, 1); border-right: 1px solid rgba(229, 229, 229, 1); border-bottom: 1px solid rgba(229, 229, 229, 1); border-left: 1px solid rgba(238, 238, 238, 1) }
.on-focus-mode blockquote { border-left-color: rgba(85, 85, 85, 0.12) }
header, .context-menu, .megamenu-content, footer { font-family: “Segoe UI”, “Arial”, sans-serif }
.file-node-content:hover .file-node-icon, .file-node-content:hover .file-node-open-state { visibility: visible }
.mac-seamless-mode #typora-sidebar { background-color: var(–side-bar-bg-color) }
.md-lang { color: rgba(180, 101, 77, 1) }
.html-for-mac .context-menu { –item-hover-bg-color: #E6F0FE }
#md-notification .btn { border: 0 }
.dropdown-menu .divider { border-color: rgba(229, 229, 229, 1) }
.ty-preferences .window-content { background-color: rgba(250, 250, 250, 1) }
.ty-preferences .nav-group-item.active { color: rgba(255, 255, 255, 1); background: rgba(153, 153, 153, 1) }
.typora-export li, .typora-export p, .typora-export, .footnote-line { white-space: normal }