UIWebView

当js中有相应方法的实现 若在OC中同样写该方法的实现 这个时候 还是调用的OC中的实现

因使用JSContent 代表js代码已经执行完毕 然后使用JSContent["方法名"]实现方法也就意味着是重写了js里面的方法实现

 NSDictionary *dict = @{@"name":@"cooci",@"age":@18};
 [[JSContext currentContext][@"ocCalljs"] callWithArguments:@[dict,@"咸鱼"]];

OC传递给JS的不是数组 是以数组的形式包装的参数

可以把oc的对象赋值给js中的对象 实现js直接调用oc的方法实现

 KC_JSObject *obj = [[KC_JSObject alloc] init];
 jsContext["kcObject"] = kcObject;

@protocol KCProtocol <JSExport>
JSExportAs(letShowImage, - (void)letShowImage:(NSString *)str);
JSExportAs(getSum, - (int)getSum:(int)num1 num2:(int)num2);
@end

@interface KC_JSObject : NSObject<KCProtocol>

@property (nonatomic, copy) NSString *name;

@end

遵守JSExport 协议实现的方法 也可在OC中直接调用
JavaScriptCore回调回来是子线程

WKWebView

实现如下代码可自适应宽高

WKWebViewConfiguration *configuration = [[WKWebViewConfiguration alloc] init];
NSString *jScript = @"var meta = document.createElement('meta'); meta.setAttribute('name', 'viewport'); meta.setAttribute('content', 'width=device-width'); document.getElementsByTagName('head')[0].appendChild(meta);";
WKUserScript *wkUScript = [[WKUserScript alloc] initWithSource:jScript injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES];
WKUserContentController *wkUController = [[WKUserContentController alloc] init];
[wkUController addUserScript:wkUScript];
configuration.userContentController = wkUController;
    
self.webView = [[WKWebView alloc] initWithFrame:self.view.frame configuration:configuration];
self.webView.UIDelegate = self;
[self.view addSubview:self.webView];

如果使用WKUserContentController 必须考虑循环引用的问题

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 - WKNavigationDelegate
////请求之前，决定是否要跳转:用户点击网页上的链接，需要打开新页面时，将先调用这个方法。
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler;
////接收到相应数据后，决定是否跳转
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler;
////页面开始加载时调用
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(null_unspecified WKNavigation *)navigation;
//// 主机地址被重定向时调用
- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(null_unspecified WKNavigation *)navigation;
//// 页面加载失败时调用
- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error;
//// 当内容开始返回时调用
- (void)webView:(WKWebView *)webView didCommitNavigation:(null_unspecified WKNavigation *)navigation;
//// 页面加载完毕时调用
- (void)webView:(WKWebView *)webView didFinishNavigation:(null_unspecified WKNavigation *)navigation;
////跳转失败时调用
- (void)webView:(WKWebView *)webView didFailNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error;
//// 如果需要证书验证，与使用AFN进行HTTPS证书验证是一样的
- (void)webView:(WKWebView *)webView didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential *__nullable credential))completionHandler;
////9.0才能使用，web内容处理中断时会触发
- (void)webViewWebContentProcessDidTerminate:(WKWebView *)webView NS_AVAILABLE(10_11, 9_0);