iOS 和 H5 互動那些事（UIWebView、WKWebView 總結篇）

陳雨塵發表於2018-07-18

1.OC與JS互動之UIWebView

######建立一個UIWebView 並載入

  _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;   
  / 新增 webiview
[self.view addSubview:self.webView];
// 載入請求
// 1.URL
NSURL *url = [NSURL URLWithString:HOME_URL];
// 2.建立請求
NSURLRequest *request = [NSURLRequest requestWithURL:url];
// 3.載入請求
[self.webView loadRequest:request];
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######UIWebView delegate 協議方法

   //網頁即將開始載入
 - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType;

  //網頁開始載入
 - (void)webViewDidStartLoad:(UIWebView *)webView;

  //網頁載入完成
  - (void)webViewDidFinishLoad:(UIWebView *)webView;

  //網頁載入失敗
  - (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error;
   //UIWebView自帶了一個方法, 可以直接呼叫JS程式碼(轉化為string型別的js程式碼)
   - (nullable NSString *)stringByEvaluatingJavaScriptFromString:(NSString *)script;

   //例如修改id為‘html’標籤內部的text屬性
   [web stringByEvaluatingJavaScriptFromString:@"document.getElementById('html').innerText='修改內容'"];

     //也可以執行多行js程式碼
 [web stringByEvaluatingJavaScriptFromString:@"var div = document.getElementById('html'); div.innerText = '修改內容'"];
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####// JS呼叫OC

一，js裡面直接呼叫方法

方法1

程式碼如下

  - (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;
}
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在這個網頁即將載入的方法裡面做一些網址的擷取，可以做一些相應的處理，對某些特定的網址做不同的處理。至於返回YES 還是NO 就根據你們的需求做處理

方法2

在網頁載入完成之後使用蘋果推薦的JavaScriptCore

對於有引數傳遞的也是有兩種方法獲取，詳細見圖

程式碼如下

    - (void)webViewDidFinishLoad:(UIWebView *)webView
  {
         if ([[webView.request.URL absoluteString] hasPrefix:[NSString stringWithFormat:@"%@/stats/index?orgId=",PR_AppDotNetAPIBaseURLString]]) {
      self.title = @"我的機構";
 } 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 = @"機構購買學幣";
    [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];
};
}
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二，js裡面通過物件呼叫方法這裡以微信和支付寶支付為例子這裡要藉助 JSExport 可以制定一個協議

 @protocol JSLivingDelegate <JSExport>
/**
  * 支付寶支付
  *
  * @param ali_pay_data 支付資料
  * @param ali_order 訂單
 */
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
  遵循協議實現對應的OC方法就行了
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//OC呼叫JS

方法1

程式碼如下 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];
 //這裡面的a,b,c就是OC呼叫JS的時候給JS傳的引數
  [function callWithArguments:@[a,b,c]];
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2.OC與JS互動之WKWebView

######建立一個WKWebView 並載入

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];
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######WKWebView中的三個代理方法

1 WKNavigationDelegate

// 頁面開始載入時呼叫
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation;
// 當內容開始返回時呼叫
- (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation;
   // 頁面載入完成之後呼叫
- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation;
    // 頁面載入失敗時呼叫
- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation;

 頁面跳轉的代理方法有三種，分為（收到跳轉與決定是否跳轉兩種）

 // 接收到伺服器跳轉請求之後呼叫
- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:   (WKNavigation *)navigation;
  // 在收到響應後，決定是否跳轉
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler;
    // 在傳送請求之前，決定是否跳轉
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction  *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler;
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2 WKUIDelegate

-(WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures;
  / 介面彈出警告框
- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(void (^)())completionHandler;
// 介面彈出確認框
- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL result))completionHandler;
// 介面彈出輸入框
- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(nullable NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * __nullable result))completionHandler;
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3 WKScriptMessageHandler

 - (void)userContentController:(WKUserContentController *)userContentController 
 didReceiveScriptMessage:(WKScriptMessage *)message;
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//JS呼叫OC

也可以擷取網址這裡就不在累述在建立web的時候 self.webView = [[WKWebView alloc]initWithFrame:CGRectMake(0, 20, kScreenWidth, kScreenHeight-20) configuration:config]; 配置 config 對js 的方法進行類似註冊的操作

    WKWebViewConfiguration *config = [WKWebViewConfiguration new];
    //初始化偏好設定屬性：preferences
   config.preferences = [WKPreferences new];
    //The minimum font size in points default is 0;
   config.preferences.minimumFontSize = 10;
    //是否支援JavaScript
   config.preferences.javaScriptEnabled = YES;
    //不通過使用者互動，是否可以開啟視窗
   config.preferences.javaScriptCanOpenWindowsAutomatically = NO;
   [config.userContentController addScriptMessageHandler:self name:@"AppModel"];
   [config.userContentController addScriptMessageHandler:self name:@"ConfirmAccepts"];
    [config.userContentController addScriptMessageHandler:self name:@"ChuanPhone"];
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然後在代理做對應的處理和引數的接收

  - (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 %@, 很高興見到你",message.body];
    [self showMsg:info];
}
 
    if ([message.name isEqualToString:@"ChuanPhone"]) {
    NSArray *array = message.body;
    NSString *info = [NSString stringWithFormat:@"這是我的手機號: %@, %@ !!",array.firstObject,array.lastObject];
    [self showMsg:info];
  }
 }
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//OC 呼叫JS

  //方法 setName
  [webView evaluateJavaScript:@"setname('張三')" completionHandler:nil];
 //此處 setname為JS定義的方法名， 內部 ‘張三’為傳給JS的引數。 如果setname方法需要傳入一個json或者array等非字元引數， 需要用format方法將其轉為string型別,在呼叫evaluate方法。例如
  NSString * para = [NSString stringWithFormat:@"setname('%@')",json];
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希望能夠幫助你，有什麼問題歡迎留言。

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