背景

WebViewJavascriptBridge作为JS和原生OC的交互，通常都是在WebView中用self.bridge注册方法来进行调用，但这样对于WebView来说比较脓肿，全部逻辑处理都放在WebView下面实现，并且入参出参都是要用字符串来实现影响开发效率，后来考虑用runtime方法，让JS调用的方法都放在类里面实现

处理办法

批量注册方法

创建一个handler类，用来批量注册JS方法

@interface WKWebJSHandler : NSObject
typedef void (^JSResponseCallback)(id responseData);
@property (nonatomic,copy)NSString* handleName;//控件名称
@property (nonatomic,copy)NSDictionary* infoDic;//入参
@property (nonatomic,strong)JSResponseCallback  jsResponseCallback;//回参
-(NSArray *)getSubClassArr;//获取所有继承该类的方法
//注册控件
- (void)messageWithHandler:(NSString*)className
                withMethod:(NSString*)methodName
                  withData:(id)data
                  complete:(void (^)(id responseData))completeBlock;
@end

通过运行时，把注册的控件的入参出参model化

- (void)messageWithHandler:(NSString*)className
                withMethod:(NSString*)methodName
                  withData:(id)data
                  complete:(void (^)(id responseData))completeBlock
{
    @synchronized(self)
    {
        
        Class class = NSClassFromString(className);
        id obj = [[class alloc]init];
        
        SEL superSelector = NSSelectorFromString(@"registPluginWithHandlerName:withData:complete:");
        SEL subSelector = NSSelectorFromString(methodName);
        if ([obj respondsToSelector:superSelector]) {
            void (*func)(id, SEL, id, id, id) = (void (*)(id, SEL, id, id, id))objc_msgSend;
            func(obj,superSelector,methodName,data, completeBlock);
        }
        if ([obj respondsToSelector:subSelector]) {
            void (*func)(id, SEL) = (void (*)(id, SEL))objc_msgSend;
            func(obj, subSelector);
        }
    }
}

获取要进行注册的控件类名方法名，为了方便开发，就定义所有继承WKWebJSHandler的子类的方法都进行注册

- (void)registPluginWithHandlerName:(id)handlerName
                           withData:(id)data
                           complete:(void (^)(id responseData))completeBlock
{
    self.handleName = handlerName;
    self.infoDic = data;
    self.jsResponseCallback = ^(id responseData) {
        //返回数据给JS
        completeBlock(responseData);
    };
}
//获取子类的所有类
-(NSArray *)getSubClassArr
{
    int numClasses;
    Class * classes = NULL;
    numClasses = objc_getClassList(NULL, 0);
    //类：方法
    NSMutableArray * methodListArr = [NSMutableArray array];
    
    if (numClasses>0) {
        classes = (__unsafe_unretained Class *)malloc(sizeof(Class)* numClasses);
        numClasses = objc_getClassList(classes, numClasses);
        for (int i = 0; i < numClasses; i++) {
            if (class_getSuperclass(classes[i]) == [WKWebJSHandler class]) {
                NSString * className = NSStringFromClass(classes[i]);
                
                //获取子类下面的全部方法名
                unsigned int count;
                Method * methods = class_copyMethodList(classes[i], &count);
                for (int j = 0; j < count; j++) {
                    Method method = methods[j];
                    SEL selector = method_getName(method);
                    NSString * methodName = NSStringFromSelector(selector);
                    
//                    DebugLog(@"方法 名字 ==== %@",methodName);
//                    DebugLog(@"类 名字 ==== %@",className);
                    NSDictionary * dic = [NSDictionary dictionaryWithObject:methodName forKey:className];
                    [methodListArr addObject:dic];
                    
                }
            }
        }
        free(classes);
    }
    return (NSArray*)methodListArr;
}

bridge进行注册

WebView和UIWebView注册大同小异

// 给哪个webview建立JS与OjbC的沟通桥梁
    [WebViewJavascriptBridge enableLogging];
    self.bridge = [WebViewJavascriptBridge bridgeForWebView:webView];
    [self.bridge setWebViewDelegate:self];

    WKWebJSHandler * handle = [[WKWebJSHandler alloc]init];
    NSArray * arr = [handle getSubClassArr];
    //对所有子类方法进行注册
    for (NSDictionary * each in arr) {
        NSString * className = each.allKeys.firstObject;
        NSString * methodName = each.allValues.firstObject;
        [self.bridge registerHandler:methodName handler:^(id data, WVJBResponseCallback responseCallback) {
            [handle messageWithHandler:className withMethod:methodName withData:data complete:responseCallback];
        }];
    }

编写被JS调用方法

以后开发给JS调用的方法，只要在继承WKWebJSHandler类的子类下编写就行：

#import "WKWebJSHandler.h"

@interface WKWebControl : WKWebJSHandler

@end

调用方法，方法名就是注册方法名

@implementation WKWebControl
-(void)holdingActionFromNative
{
    DebugLog(@"收到的参数------%@",self.infoDic);
    
    //返回给JS的参数
    self.jsResponseCallback(@"调用原生方法成功！");
}

JS

JS的调用写法还是不变

document.getElementById('button').onclick = function (e) {
         log('js call objc: holdingActionFromNative')
         bridge.callHandler('holdingActionFromNative', {'title':'JStitle'}, function(response) {
                          log('JS got response', response)
                          })
       }