一.- (BOOL)webView:(UIWebView)webView shouldStartLoadWithRequest:(NSURLRequest)request navigationType:(UIWebViewNavigationType)navigationType
这种方法是利用拦截webView响应的url，对url进行处理，同时把需要执行的方法名和参数都放入url中，实现app和H5之前的方法交互：
//遵守UIWebViewDelegate代理协议。
-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{
//拿到网页的实时url
NSString *requestStr = [[request.URL absoluteString] stringByRemovingPercentEncoding];
// NSString* requestStr = @"H5GetAPPMethod://test?data={\"name\":\"wangyujian\",\"sex\":\"男\",\"age\":\"18\"}";
//在url中寻找自定义协议头"H5GetAPPMethod://"
if ([requestStr hasPrefix:@"H5GetAPPMethod://"]) {
NSArray* arr1 = [url componentsSeparatedByString:@"://"];
if (arr1.count >= 2) {
NSArray* arr2 = [arr1[1] componentsSeparatedByString:@"?"];
if (arr2.count >= 2) {
NSString* method = arr2[0];
NSString* jsonStr = [arr2[1] substringFromIndex:@"data=".length];
NSData *JSONData = [jsonStr dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:JSONData options:NSJSONReadingMutableLeaves error:nil];
NSLog(@"method = %@,xxx = %@,dic = %@",method,jsonStr,dic);
// 方法名和参数解析
[self runMethodWithName:method param:dic];
}
}
return NO;
}
return YES;
}
// 方法名和参数解析&&运行方法
- (void)runMethodWithName:(NSString*)methodName param:(NSDictionary*)param{
SEL selector = NSSelectorFromString(methodName);
self.param = param;
// // 这里报警告：PerformSelector may cause a leak because its selector is unknown
// if ([self respondsToSelector:selector]) {
// [self performSelector:selector];
// }
if ([self respondsToSelector:selector]){
IMP imp = [self methodForSelector:selector];
void (*func)(id, SEL) = (void *)imp;
func(self, selector);
}
}
- (void)test{
NSLog(@"xxxxxxxx");
}
二. WKUserContentController
这个属性是WKWebView才有的属性，主要是通过WKScriptMessageHandler的代理方法- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message 进行交互。
- (void)creatWebView{
WKWebViewConfiguration *configuration = [[WKWebViewConfiguration alloc] init]
WKUserContentController *userContentController =[[WKUserContentController alloc]init];
configuration.userContentController = userContentController;
// 根据需要去设置对应的属性
WKWebView *webView = [[WKWebView alloc]initWithFrame:self.view.bounds configuration:configuration];
webView.navigationDelegate = self;
[self.view addSubview:webView];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"URL地址"]];
[self.webView loadRequest:request];
[userContentController addScriptMessageHandler:delegateController name:@"goBack"];
}
//WKScriptMessageHandler代理方法
- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message {
if ([message.name isEqualToString:@"goBack"]) {
// 如果监控到前端调用了 'goBack' 方法代码就会走进来，在这里做处理就行了
}
}
注意：
- (void)addScriptMessageHandler:(id <WKScriptMessageHandler>)scriptMessageHandler name:(NSString *)name;
- (void)removeScriptMessageHandlerForName:(NSString *)name;
这两个方法是成对出现的，每次调用了add就必须调用remove。
三. 第三方WebViewJavascriptBridge
1.建立 WebViewJavaScriptBridge 和 WebView 之间的关系。
_jsBridge = [WebViewJavascriptBridge bridgeForWebView:_webView];
2.方法调用
1)oc调js方法（通过data可以传值，通过 response可以接受js那边的返回值 ）
id data = @{@"greetingFromObjC": @"Hi there, JS!" };
[_bridgecallHandler:@"testJavascriptHandler" data:data responseCallback:^(idresponse) {
NSLog(@"testJavascriptHandlerresponded: %@", response);
}];
2)js调oc方法（可以通过data给oc方法传值，使用responseCallback将值再返回给js）
[_bridgeregisterHandler:@"testObjcCallback" handler:^(id data,WVJBResponseCallback responseCallback) {
NSLog(@"testObjcCallback called:%@", data);
responseCallback(@"Response fromtestObjcCallback");
}];
最后：iOS调用H5方法
UIWebView：NSString *result = [webView stringByEvaluatingJavaScriptFromString:@"javascript:add(3,5);"];
WKWebView: [self.webView evaluateJavaScript:@"show()" completionHandler:^(id _Nullable response, NSError * _Nullable error) { //TODO }];
