JS&Swift相互交互
- 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
- 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)
- 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 }
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iframe { margin: auto }
a.url { word-break: break-all }
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p { line-height: inherit }
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