SwiftWebViewBridge

Swift version of WebViewJavascriptBridge with more simplified, friendly methods to send messages between Swift and JS in UIWebViews.

1. Installation
2. Preview
3. Requirements
4. How to use it
5. Dig it up

Installation

Manually(iOS7+)

Drag SwiftWebViewBridge.swift file to your project.

Preview

Requirements

1. Xcode7.0+
2. iOS7.0+

Optional

SwiftyJSON: SwiftyJSON makes it easy to deal with JSON data in Swift.

The communication between Swift and JS depends on JSON messages.The param jsonData you got in closure is deserlized by method below.You could simply pass it in JSON(jsonObject) designated initializer of SwiftJSON

NSJSONSerialization.JSONObjectWithData(serilizedData, .AllowFragments)
func JSONObjectWithData(_ data: NSData, options opt: NSJSONReadingOptions) throws -> AnyObject

How to use it:

General

1. initialize a bridge with defaultHandler
2. register handlers to handle different events
3. send data / call handler on both sides

For Swift

func bridge(_ webView: UIWebView, defaultHandler handler: SWVBHandler?) -> SwiftWebViewBridge

Generate a bridge with associated webView and default handler to deal with messages from js without specifying designated handler

let bridge = SwiftJavaScriptBridge.bridge(webView, defaultHandler: { data, responseCallback in
    print("Swift received message from JS: \(data)")
    responseCallback("Swift already got your msg, thanks")
}) 

func registerHandlerForJS(handlerName name: String, handler:SWVBHandler)

Register a handler for JavaScript calling

// take care of retain cycle!
bridge.registerHandlerForJS(handlerName: "getSesionId", handler: { [unowned self] data, responseCallback in
    let sid = self.session            
    responseCallback(["msg": "Swift has already finished its handler", "returnValue": [1, 2, 3]])
})

func sendDataToJS(_ data: SWVBData)

Simply Sent data to JS

bridge.sendDataToJS(["msg": "Hello JavaScript", "gift": ["100CNY", "1000CNY", "10000CNY"]])

func sendDataToJS(_ data: SWVBData, responseCallback: SWVBResponseCallBack?)

Send data to JS with callback closure

bridge.sendDataToJS("Did you received my gift, JS?", responseCallback: { data in
    print("Receiving JS return gift: \(data)")
})

func callJSHandler(_ handlerName: String?, params: SWVBData?, responseCallback: SWVBResponseCallBack?)

Call JavaScript registered handler

bridge.callJSHandler("alertReceivedParmas", params: ["msg": "JS, are you there?"], responseCallback: nil)

typealias mentioned above

/// 1st param: responseData to JS
public typealias SWVBResponseCallBack = (NSDictionary) -> Void
/// 1st param: jsonData sent from JS; 2nd param: responseCallback for sending data back to JS
public typealias SWVBHandler = (AnyObject, @escaping SWVBResponseCallBack) -> Void
public typealias SWVBData = [String: Any]

logging for debug

SwiftWebViewBridge.logging = false  //default true

For JavaScript

function init(defaultHandler)

bridge.init(function(message, responseCallback) {
    log('JS got a message', message)
    var data = { 'JS Responds' : 'Message received = )' }
    responseCallback(data)
})

function registerHandlerForSwift(handlerName, handler)

bridge.registerHandlerForSwift('alertReceivedParmas', function(data, responseCallback) {
    log('ObjC called alertPassinParmas with', JSON.stringify(data))
    alert(JSON.stringify(data))
    var responseData = { 'JS Responds' : 'alert triggered' }
    responseCallback(responseData)
})

function sendDataToSwift(data, responseCallback)

bridge.sendDataToSwift('Say Hello Swiftly to Swift')
bridge.sendDataToSwift('Hi, anybody there?', function(responseData){
    alert("got your response: " + JSON.stringify(responseData))
})

function callSwiftHandler(handlerName, data, responseCallback)

SwiftWebViewBridge.callSwiftHandler("printReceivedParmas", {"name": "小明", "age": "6", "school": "GDUT"}, function(responseData){
    log('JS got responds from Swift: ', responseData)
})

Dig it up

The source code have very detailed comments, this will help you to dig it up if you are interesting in how swift and javascript communicate with each other. What’s more, you can find the unminified javascript file in UnminifiedJavascript document.