iOS 和 H5 交互那些事（UIWebView、WKWebView 总结篇）

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1.OC与JS交互之UIWebView

创建一个UIWebView 并加载

  _webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 20, self.view.frame.size.width, self.view.frame.size.height-20)];
  _webView.delegate = self;
  _webView.scrollView.bounces = NO;   
  / 添加 webiview
[self.view addSubview:self.webView];
// 加载请求
// 1.URL
NSURL *url = [NSURL URLWithString:HOME_URL];
// 2.创建请求
NSURLRequest *request = [NSURLRequest requestWithURL:url];
// 3.加载请求
[self.webView loadRequest:request];

UIWebView delegate 协议方法

   //网页即将开始加载
 - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType;

  //网页开始加载
 - (void)webViewDidStartLoad:(UIWebView *)webView;

  //网页加载完成
  - (void)webViewDidFinishLoad:(UIWebView *)webView;

  //网页加载失败
  - (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error;
   //UIWebView自带了一个方法, 可以直接调用JS代码(转化为string类型的js代码)
   - (nullable NSString *)stringByEvaluatingJavaScriptFromString:(NSString *)script;

   //例如修改id为‘html’标签内部的text属性
   [web stringByEvaluatingJavaScriptFromString:@"document.getElementById('html').innerText='修改内容'"];

     //也可以执行多行js代码
 [web stringByEvaluatingJavaScriptFromString:@"var div = document.getElementById('html'); div.innerText = '修改内容'"];

// JS调用OC

一，js里面直接调用方法

方法1

1.png

代码如下

  - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
NSLog(@"%@",request.URL );
if ([[request.URL absoluteString] hasPrefix:[NSString stringWithFormat:@"%@/stats/index?orgId=",PR_AppDotNetAPIBaseURLString]]) {
    [self menuLeftBarButton];
} else {
    [self setDefaultBackButton];
    [self setRightButton];
}

    return YES;
}

在这个网页即将加载的方法里面做一些网址的截取，可以做一些相应的处理，对某些特定的网址做不同的处理。至于返回YES 还是NO 就根据你们的需求做处理

方法2

2.png

在网页加载完成之后使用苹果推荐的JavaScriptCore

2.png

对于有参数传递的也是有两种方法获取，详细见图

4.png

代码如下

    - (void)webViewDidFinishLoad:(UIWebView *)webView
  {
         if ([[webView.request.URL absoluteString] hasPrefix:[NSString stringWithFormat:@"%@/stats/index?orgId=",PR_AppDotNetAPIBaseURLString]]) {
      self.title = @"我的机构";
 } else {
     self.title = [webView stringByEvaluatingJavaScriptFromString:@"document.title"];
}
      if ([[webView.request.URL absoluteString] hasPrefix:[NSString stringWithFormat:@"%@/newstats/hot/",PR_AppDotNetAPIBaseURLString]]) {
       [self touchToDetail];
}
       [self invokeJS];
 }
      - (void)invokeJS {
JSContext *context = [self.webView  valueForKeyPath:@"documentView.webView.mainFrame.javaScriptContext"];

context[@"orgBuyCoin"] = ^() {
    BuyCoinViewController *vc = [[BuyCoinViewController alloc] initWithNibName:@"BuyCoinViewController" bundle:nil];
    vc.whicePay = @"BCPay";
    vc.productType = @"4";
    vc.title = @"机构购买学币";
    [self.navigationController pushViewController:vc animated:YES];
};

context[@"buyMembers"] = ^() {
   NSNumber *MemberCount = [[NSNumber alloc] init];
    NSArray *args = [JSContext currentArguments];
    MemberCount = (NSNumber *)args[0];
    JSValue *this = [JSContext currentThis];
    NSLog(@"this8888888888888: %@",this);
    NSLog(@"-------End Log-------");
    
    BuyMembersViewController *vc = [[BuyMembersViewController alloc] initWithNibName:@"BuyMembersViewController" bundle:nil];
    //返回的
    NSLog(@"-----MemberCount:%@", MemberCount);
    vc.MemberCount = MemberCount;
    [self.navigationController pushViewController:vc animated:YES];
};
}

二，js里面通过对象调用方法这里以微信和支付宝支付为例子这里要借助 JSExport 可以制定一个协议

 @protocol JSLivingDelegate <JSExport>
/**
  * 支付宝支付
  *
  * @param ali_pay_data 支付数据
  * @param ali_order 订单
 */
JSExportAs(ali_pay,
 - (void)ali_sub:(id)ali_pay_data order:(id)ali_order
   );
   //微信支付
 JSExportAs(wx_pay,
 - (void)wxpay_sub:(NSString *)appId
    nonceStr:(NSString *)nonceStr
    outTradeNo:(NSString *)outTradeNo
    package:(NSString *)package
    partnerid:(NSString *)partnerid
    paySign:(NSString *)paySign
    prepayid:(NSString *)prepayid
    signTyp:(NSString *)signTyp
    timeStamp:(NSString *)timeStamp
  );
 @end
  遵循协议实现对应的OC方法就行了

//OC调用JS

方法1

5.png

代码如下 iOS 7之前 [self.webView stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"addressCallBack('%@','%@','%@','%@');",provincecid,province,citycid,city]];

方法2

  NSString * method = @"dolike";
  JSValue * function = [self.context objectForKeyedSubscript:method];
 //这里面的a,b,c就是OC调用JS的时候给JS传的参数
  [function callWithArguments:@[a,b,c]];

2.OC与JS交互之WKWebView

创建一个WKWebView 并加载

self.webView = [[WKWebView alloc]initWithFrame:CGRectMake(0, 20, kScreenWidth, kScreenHeight-20) configuration:config];
self.webView.scrollView.bounces = NO;
self.webView.UIDelegate = self;
self.webView.navigationDelegate = self;
NSURL *url = [NSURL URLWithString:string];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[self.webView loadRequest:request];

WKWebView中的三个代理方法

1 WKNavigationDelegate

// 页面开始加载时调用
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation;
// 当内容开始返回时调用
- (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation;
   // 页面加载完成之后调用
- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation;
    // 页面加载失败时调用
- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation;

 页面跳转的代理方法有三种，分为（收到跳转与决定是否跳转两种）

 // 接收到服务器跳转请求之后调用
- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:   (WKNavigation *)navigation;
  // 在收到响应后，决定是否跳转
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler;
    // 在发送请求之前，决定是否跳转
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction  *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler;

2 WKUIDelegate

-(WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures;
  / 界面弹出警告框
- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(void (^)())completionHandler;
// 界面弹出确认框
- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL result))completionHandler;
// 界面弹出输入框
- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(nullable NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * __nullable result))completionHandler;

3 WKScriptMessageHandler

 - (void)userContentController:(WKUserContentController *)userContentController 
 didReceiveScriptMessage:(WKScriptMessage *)message;

//JS调用OC

也可以截取网址这里就不在累述在创建web的时候 self.webView = [[WKWebView alloc]initWithFrame:CGRectMake(0, 20, kScreenWidth, kScreenHeight-20) configuration:config]; 配置 config 对js 的方法进行类似注册的操作

    WKWebViewConfiguration *config = [WKWebViewConfiguration new];
    //初始化偏好设置属性：preferences
   config.preferences = [WKPreferences new];
    //The minimum font size in points default is 0;
   config.preferences.minimumFontSize = 10;
    //是否支持JavaScript
   config.preferences.javaScriptEnabled = YES;
    //不通过用户交互，是否可以打开窗口
   config.preferences.javaScriptCanOpenWindowsAutomatically = NO;
   [config.userContentController addScriptMessageHandler:self name:@"AppModel"];
   [config.userContentController addScriptMessageHandler:self name:@"ConfirmAccepts"];
    [config.userContentController addScriptMessageHandler:self name:@"ChuanPhone"];

然后在代理做对应的处理和参数的接收

  - (void)userContentController:(WKUserContentController *)userContentController 
     didReceiveScriptMessage:(WKScriptMessage *)message {
      NSLog(@"%@",NSStringFromSelector(_cmd));
     NSLog(@"%@",message.body);

    if ([message.name isEqualToString:@"AppModel"]) {
    [self showMsg:@"我收到js的AppModel"];
}
 
   if ([message.name isEqualToString:@"ConfirmAccepts"]) {
    NSString *info = [NSString stringWithFormat:@"你好 %@, 很高兴见到你",message.body];
    [self showMsg:info];
}
 
    if ([message.name isEqualToString:@"ChuanPhone"]) {
    NSArray *array = message.body;
    NSString *info = [NSString stringWithFormat:@"这是我的手机号: %@, %@ !!",array.firstObject,array.lastObject];
    [self showMsg:info];
  }
 }

//OC 调用JS

  //方法 setName
  [webView evaluateJavaScript:@"setname('张三')" completionHandler:nil];
 //此处 setname为JS定义的方法名， 内部 ‘张三’为传给JS的参数。 如果setname方法需要传入一个json或者array等非字符参数， 需要用format方法将其转为string类型,在调用evaluate方法。例如
  NSString * para = [NSString stringWithFormat:@"setname('%@')",json];

希望能够帮助你，有什么问题欢迎留言。

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