WebViewJavascriptBridge的使用说明

WebViewJavascriptBridge 项目介绍

在Obj-C 和 WKWebView, UIWebView 中的 Javascript之间传送信息的桥梁。

项目地址

如何使用

Javascript的介绍

    <script>
        window.onerror = function(err) {
                log('window.onerror: ' + err)
            }
            //下面的方法是必备
        function setupWebViewJavascriptBridge(callback) {
            if (window.WebViewJavascriptBridge) {
                return callback(WebViewJavascriptBridge);
            }
            if (window.WVJBCallbacks) {
                return window.WVJBCallbacks.push(callback);
            }
            window.WVJBCallbacks = [callback];
            var WVJBIframe = document.createElement('iframe');
            WVJBIframe.style.display = 'none';
            WVJBIframe.src = 'wvjbscheme://__BRIDGE_LOADED__';
            document.documentElement.appendChild(WVJBIframe);
            setTimeout(function() {
                document.documentElement.removeChild(WVJBIframe)
            }, 0)
        }
        setupWebViewJavascriptBridge(function(bridge) {
            var uniqueId = 1;
            //打印方法
            function log(message, data) {
                var log = document.getElementById('log')
                var el = document.createElement('div')
                el.className = 'logLine'
                el.innerHTML = uniqueId++ + '. ' + message + ':<br/>' + JSON.stringify(data)
                if (log.children.length) {
                    log.insertBefore(el, log.children[0])
                } else {
                    log.appendChild(el)
                }
            }
            //JS 注册处理，名字需与 ObjC 一致
            bridge.registerHandler('testJavascriptHandler', function(data, responseCallback) {
                log('ObjC called testJavascriptHandler with', data)
                var responseData = {
                    'Javascript Says': 'Right back atcha!'
                }
                log('JS responding with', responseData)
                responseCallback(responseData)
            })

            document.body.appendChild(document.createElement('br'))

            var callbackButton = document.getElementById('buttons').appendChild(document.createElement('button'))
            callbackButton.innerHTML = 'Fire testObjcCallback'
            callbackButton.onclick = function(e) { // 点击按钮事件
                e.preventDefault();
                log('JS calling handler "testObjcCallback"');
                // JS 向 ObjC 传数据的方式，callHandler（方法标识符， 数据， 回调）
                bridge.callHandler('testObjcCallback', {
                    'foo': 'bar'
                }, function(response) {
                    log('JS got response', response);
                })
            }
        })
    </script>

ObjC 中的使用介绍

引入头文件

#import "WebViewJavascriptBridge.h"

声明变量

@property WebViewJavascriptBridge* bridge;

实现方法

if (_bridge) { return; }
    
    
    UIWebView* webView = [[UIWebView alloc] initWithFrame:self.view.bounds];
    [self.view addSubview:webView];
    
    [WebViewJavascriptBridge enableLogging];
    
    _bridge = [WebViewJavascriptBridge bridgeForWebView:webView];
    [_bridge setWebViewDelegate:self];
    
    [_bridge callHandler:@"testJavascriptHandler" data:@{@"foo":@"before ready"}];
    
    
    [_bridge registerHandler:@"testObjcCallback" handler:^(id data, WVJBResponseCallback responseCallback) {
        NSLog(@"testObjcCallback called: %@", data);
        NSString *strDD = [NSString stringWithFormat:@"hello world: %@",data];
        responseCallback(strDD);
    }];