OC与JS交互

作者: Code_人生 | 来源:发表于2019-05-21 20:38 被阅读110次

一、UIWebView

1.1 直接URL拦截

1.1.1 JS调用OC：shouldStartLoadWithRequest 拦截URL（自定义的），request.URL.scheme(标识我们自己协议)、request.URL.host(方法名)、request.URL.pathComponents(参数)
1.1.2 OC调用JS：stringByEvaluatingJavaScriptFromString 这里直接执行JS代码

    UIWebView *web = [[UIWebView alloc] initWithFrame:self.webView.frame];
    [self.view insertSubview:web belowSubview:self.viewNavBg];

    NSString *javascript1 = [NSString stringWithFormat:@"window.mapInfo = '%@'",data.mj_JSONString];
    [web stringByEvaluatingJavaScriptFromString:javascript1];//给window.mapInfo 赋值

    [web stringByEvaluatingJavaScriptFromString:@"var aa = 'hello wolrd'"];//给aa 赋值
    [web stringByEvaluatingJavaScriptFromString:@"shiwu()"];//执行shiwu函数

1.2 JavaScriptCore

1.2.1 OC调用JS 1、jsContext evaluateScript 、 2、jsContext callWithArguments
1.2.2 JS调用OC: self.jsContext[@"showMessage"] = ^() {} 这样的 block 回调执行代码块
1.2.3 注意
- 异常收集 jsContext.exceptionHandler = ^(JSContext *context, JSValue *exception) {}
- 全局变量 [self.jsContext evaluateScript:@"var arr = [3, 'Cooci', 'abc'];"
- JS 操作对象 JSExport
- 循环引用
- block 回来是子线程

    //JSContext就为其提供着运行环境 H5上下文
    //一开始写在web创建([self.view addSubview:self.webView])之后，然后可以给web传值，之后等加载完毕(webViewDidFinishLoad)再赋一次值
    JSContext *jsContext = [self.webView valueForKeyPath:@"documentView.webView.mainFrame.javaScriptContext"];

    jsContext[@"aa"] = @"你好 世界";//给aa 赋值
    [jsContext evaluateScript:@"var aa = 'hello wolrd'"];//给aa 赋值

    JSValue *arrValue = self.jsContext[@"arr"];//取值
    //toString、toDictionary、toDate、toInt32 等等

    //OC调用JS
    [self.jsContext evaluateScript:@"shiwu()"];//执行shiwu函数
    //提供全局变量
    [self.jsContext evaluateScript:@"var arr = [3, 'Cooci', 'abc'];"];
    //OC调用JS的ocCalljs方法，以数组的形式传入参数
    [self.jsContext[@"ocCalljs"] callWithArguments:@[dict]];

    //JS调用OC
    self.jsContext[@"showMessage"] = ^() {
        JSValue *thisValue = [JSContext currentThis];
        NSLog(@"thisValue = %@",thisValue);
        JSValue *cValue = [JSContext currentCallee];
        NSLog(@"cValue = %@",cValue);
        NSArray *args = [JSContext currentArguments];
        NSLog(@"来了:%@",args);
        NSDictionary *dict = @{@"name":@"cooci",@"age":@18};
        [[JSContext currentContext][@"ocCalljs"] callWithArguments:@[dict]];
    };

    self.jsContext[@"showDict"] = ^(JSValue *value) {
        NSArray *args = [JSContext currentArguments];
        JSValue *dictValue = args[0];
        NSDictionary *dict = dictValue.toDictionary;
        NSLog(@"%@",dict);
        
        // 模拟用
        int num = [[arrValue.toArray objectAtIndex:0] intValue];
        num += 10;
        NSLog(@"arrValue == %@   num == %d",arrValue.toArray,num);
        dispatch_async(dispatch_get_main_queue(), ^{
            weakSelf.showLabel.text = dict[@"name"];
        });

        function openAlbumImage(){
            getImage();
            kcObject.letShowImage();
            alert(kcObject.getS(10,30));
        }
    };

    // JS 操作对象
    KC_JSObject *kcObject = [[KC_JSObject alloc] init];
    self.jsContext[@"kcObject"] = kcObject;
    NSLog(@"kcObject == %d",[kcObject getSum:20 num2:40]);

html 代码
        function openAlbumImage(){
            getImage();
            kcObject.letShowImage();
            alert(kcObject.getS(10,30));
        }

---------.h------------
#import <Foundation/Foundation.h>
#import <JavaScriptCore/JavaScriptCore.h>

@protocol KCProtocol <JSExport>

- (void)letShowImage;
// 协议 - 协议方法 
JSExportAs(getS, -(int)getSum:(int)num1 num2:(int)num2);

@end

@interface KC_JSObject : NSObject<KCProtocol>
@end

---------.m------------

#import "KC_JSObject.h"

@implementation KC_JSObject;

- (void)letShowImage{
    NSLog(@"打开相册,上传图片");
}

- (int)getSum:(int)num1 num2:(int)num2{
    NSLog(@"来了");
    // int (nil) - jsvalue (0)
    return num1+num2;
}

@end

二、WKWebView

2.1 直接URL拦截

2.1.1 JS调用OC：
- - (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler{}
- decisionHandler(WKNavigationActionPolicyCancel) 取消跳转
2.1.2 OC调用JS：[self.webView evaluateJavaScript:jsStr completionHandler:^(id _Nullable result, NSError * _Nullable error) {回调}];

//JS调用OC
#pragma mark - WKNavigationDelegate
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler
{
    NSURL *URL = navigationAction.request.URL;
    NSString *scheme = [URL scheme];
    if ([scheme isEqualToString:@"lgedu"]) {
        NSString *host = [URL host];
        if ([host isEqualToString:@"jsCallOC"]) {

        }else{
            NSLog(@"不明地址 %@",host);
        }
        decisionHandler(WKNavigationActionPolicyCancel);
        return;
    }
    decisionHandler(WKNavigationActionPolicyAllow);
}

//OC调用JS
    NSString *jsStr = [NSString stringWithFormat:@"showAlert('%@')",@"登陆成功"];
    [self.webView evaluateJavaScript:jsStr completionHandler:^(id _Nullable result, NSError * _Nullable error) {
        NSLog(@"%@----%@",result, error);
    }];

2.2 MessageHandler

2.2.1 OC调用JS：[self.webView evaluateJavaScript:jsStr completionHandler:^(id _Nullable result, NSError * _Nullable error) {回调}]; 同上
2.2.2 JS调用OC：
- [self.webView.configuration.userContentController addScriptMessageHandler:self name:@"messgaeOC"]
- [self.webView.configuration.userContentController removeScriptMessageHandlerForName:@"messgaeOC"] 循环引用移除
- - (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message{} 代理回调

//self - webView - configuration - userContentController - self
- (void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    [self.webView.configuration.userContentController addScriptMessageHandler:self name:@"messgaeOC"];
}
- (void)viewWillDisappear:(BOOL)animated{
    [super viewWillDisappear:animated];
    [self.webView.configuration.userContentController removeScriptMessageHandlerForName:@"messgaeOC"];
}
#pragma mark - WKScriptMessageHandler
- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message{   
    if (message.name) {
        // OC 层面的消息
    }    
    NSLog(@"message == %@ --- %@",message.name,message.body);    
}

.html
        function messgaeHandle(){
            // js -- android
            window.webkit.messageHandlers.messgaeOC.postMessage("Cooci 消息");
        }

三、WebViewJavascriptBridge

pod 'WebViewJavascriptBridge'

3.1、JS端

3.1.1 setupWebViewJavascriptBridge
目的是加载一次wvjbscheme://BRIDGE_LOADED，来触发往HTML中注入一些已经写好的JS方法。
3.1.2 setupWebViewJavascriptBridge()调用
bridge.registerHandler('OCCallJSFunction', function(data, responseCallback) {}) 所有要被调用OC的，都需要在这里注册
3.1.3 WebViewJavascriptBridge.callHandler('jsCallsOC', {'Cooci': '18'}, function(response) {}) js 调用OC 的区域，可以穿参数

    <script>
     
       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) {
         // JS 被调用的方法  OCCallJSFunction 定义的标识
            //OC调用JS     
            bridge.registerHandler('OCCallJSFunction', function(data, responseCallback) {
                alert('JS方法被调用:'+data);
                responseCallback('js执行过了');//这句注掉，OC中responseCallback就不会走
            })
         })
                                 
         //JS调用OC                        
         function showWBJ(){
             WebViewJavascriptBridge.callHandler('jsCallsOC', {'Cooci': '18'}, function(response) {
                  alert(response);
              })
         }
       
    </script>

<body>
    <input type="button" value="提交" onclick="showWBJ()" /> <br />
</body>

3.2、OC端

3.2.1 [self.wjb registerHandler:@"jsCallsOC" handler:^(id data, WVJBResponseCallback responseCallback) {}]; 被JS 调用回来的地方
3.2.2 [self.wjb callHandler:@"OCCallJSFunction" data:@"oc调用JS咯" responseCallback:^(id responseData) { }]; OC调用JS

    self.wjb = [WebViewJavascriptBridge bridgeForWebView:self.webView];
    // 如果你要在VC中实现 UIWebView的代理方法 就实现下面的代码(否则省略)
     [self.wjb setWebViewDelegate:self];

    //JS调用OC
    [self.wjb registerHandler:@"jsCallsOC" handler:^(id data, WVJBResponseCallback responseCallback) {
        NSLog(@"currentThread == %@",[NSThread currentThread]);
        NSLog(@"data == %@ -- %@",data,responseCallback);
//        responseCallback(@"123");//这句注掉，JS中回调就不会走
    }];

    //OC调用JS
    [self.wjb callHandler:@"OCCallJSFunction" data:@"oc调用JS咯" responseCallback:^(id responseData) {
        NSLog(@"currentThread == %@",[NSThread currentThread]);
        NSLog(@"调用完JS后的回调：%@",responseData);
    }];

四、Cordova

略

OC与JS交互

一、UIWebView

1.1 直接URL拦截

1.2 JavaScriptCore

二、WKWebView

2.1 直接URL拦截

2.2 MessageHandler

三、WebViewJavascriptBridge

3.1、JS端

3.2、OC端

四、Cordova

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