项目里涉及到JS和OC的交互，之前使用的是UIWebView加载的网页，只有JS调用OC，所以这里就总结一下这两天的测试，MARK一下，下一步打算使用WKWebView：
3种方式：
1）通过拦截网址的方法，网页加载过程中就可以进行交互
2）方法拦截，只有网页加载完毕才可以进行交互
3）JavaScriptCore ，同样只有网页加载完毕才可以交互。

网址拦截

使用到的代理方法为

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{
NSString *urlStr = [request.URL absoluteString];
//这里对网址进行判断 返回YES 或NO
return YES;
}

方法拦截

贴出部分代码：

- (void)webViewDidFinishLoad:(UIWebView *)webView{
//禁用长按触控操作
    [webView stringByEvaluatingJavaScriptFromString:@"document.documentElement.style.webkitTouchCallout='none';"];
    //禁止用户选择页面元素
    [webView stringByEvaluatingJavaScriptFromString:@"document.documentElement.style.webkitUserSelect='none';"];
    
 NSString *currentURL = [webView stringByEvaluatingJavaScriptFromString:@"document.location.href"];
    
    NSString *title = [webView stringByEvaluatingJavaScriptFromString:@"document.title"];
   
    NSLog(@"===URL:>%@>>>>>>>title:%@",currentURL,title);

    [[NSUserDefaults standardUserDefaults] setInteger:0 forKey:@"WebKitCacheModelPreferenceKey"];

__weak typeof(&*self) weakSelf = self;
    
    JSContext *context = [webView valueForKeyPath:@"documentView.webView.mainFrame.javaScriptContext"];

context.exceptionHandler=^(JSContext *context, JSValue *exception){
            HHLog(@"JS Error :%@",exception);
            [weakSelf setMyAlertViewWithMessage:exception.context.name];
        };

context[@"productDetail"] = ^{//商品详情
            HHLog(@"商品详情");
            NSArray *args = [JSContext currentArguments];
            NSInteger productID = [[[args firstObject] toNumber] integerValue];
    
            dispatch_async(dispatch_get_main_queue(), ^{
                [weakSelf goToGoodsDetailVCWithGoodsID:productID];
            });
        };



}

JavaScriptCore

1.导入系统的库

#import <JavaScriptCore/JavaScriptCore.h>

2.创建了一个JS与OC交互的模型类
贴上模型类里.h文件的代码

#import <Foundation/Foundation.h>

@protocol HHJSObjcModelDelegate <JSExport>

//商品列表
- (void)category:(NSString *)paramsStr;
//商品详情
- (void)productDetail:(NSString *)goodsIDStr;
//品牌分类
- (void)cateogrymore;
//活动类型
- (void)activity:(NSString *)paramsStr;

@end

@interface HHJSObjcModel : NSObject<HHJSObjcModelDelegate>

@property (nonatomic, strong) JSContext *jsContext;
@property (nonatomic, weak) UIWebView *webView;
@property (nonatomic, weak) UIViewController *webVC;

@end

3.在viewController里的代码

__weak typeof(&*self) weakSelf = self;
    
        JSContext *context = [webView valueForKeyPath:@"documentView.webView.mainFrame.javaScriptContext"];
    
        HHJSObjcModel *model = [[HHJSObjcModel alloc]init];
        context[@"android"] = model;
        model.jsContext = context;
        model.webView = self.webView;
        model.webVC = self;
    
        context.exceptionHandler=^(JSContext *context, JSValue *exception){
            HHLog(@"JS Error :%@",exception);
            [weakSelf setMyAlertViewWithMessage:exception.context.name];
        };

使用UIWebView加载网页，多次刷新 内存都在不断的上涨，即使是采用网上的方法设置缓存策略 清理URLCache，问题依然无法得到解决.

[[NSURLCache sharedURLCache] setMemoryCapacity:1024*1024*2];

if (self.webRequest) {
                [[NSURLCache sharedURLCache] removeCachedResponseForRequest:self.webRequest];
                [[NSURLCache sharedURLCache] removeAllCachedResponses];
            }
                        
            if (self.webRequest == nil) {
                self.webRequest = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:urlStr] cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:3];
//                [self.webRequest setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData];
            }
            [self.webView loadRequest:self.webRequest];