我写WKWebView 想让 服务端相应 一个 方法但是不响应，根据 UIWebView 用 JSContext就能拿到响应的处理经验是不是服务端 也需要 对 WKwebView有兼容的一个写法？？？ 特此学习 WKWebView 记录
一 .WKWebView 代理协议
(1)WKScriptMessageHandler :
OC在JS调用方法时做的处理。如果需要调用对话窗口就会先执行（3）协议再执行 （1）协议
好处：传递给OC的参数直接在字典里面，不用再在url里面拼凑后的结果去截取解析。
必须实现
- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message
(2)WKNavigationDelegate:
处理页面跳转和载入过程。
#pragma mark -- 进行页面跳转 // 接收到服务器跳转请求之后再执行 - (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(null_unspecified WKNavigation *)navigation; // 在发送请求之前，决定是否跳转 - (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler ; // 在收到响应后，决定是否跳转 - (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler ;
#pragma mark -- 追踪加载过程 // 页面开始加载时调用 - (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(null_unspecified WKNavigation *)navigation; // 当内容开始返回时调用 - (void)webView:(WKWebView *)webView didCommitNavigation:(null_unspecified WKNavigation *)navigation; // 页面加载完成之后调用 - (void)webView:(WKWebView *)webView didFinishNavigation:(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; //好多协议 按需添加。。。
(3)WKUIDelegate
这个协议主要用于WKWebView处理web界面的三种提示框(警告框、确认框、输入框) 的网页交互
#pragma mark - WKUIDelegate //警告 - (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler； //确认 - (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL result))completionHandler; // 输入框 - (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(nullable NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * __nullable result))completionHandler；
二.协议使用
(1)WKScriptMessageHandler ,关键在当前页面销毁后要注销协议保证无强引用，当前页面也无法销毁，发生内存泄漏。
//注册协议 self.userContentController = [[WKUserContentController alloc] init]; //注册方法 WKDelegateController *delegateController = [[WKDelegateController alloc]init]; delegateController.delegate = self; // 通过JS与webview内容交互 config.userContentController = self.userContentController; // 注入JS对象名称HFAlert，HFConfirm,HFPrompt当JS通过HFAlert，HFConfirm,HFPrompt来调用时， // 我们可以在WKScriptMessageHandler代理中接收到 [config.userContentController addScriptMessageHandler:delegateController name:HFAlert]; [config.userContentController addScriptMessageHandler:delegateController name:HFConfirm]; [config.userContentController addScriptMessageHandler:delegateController name:HFPrompt]; [config.userContentController addScriptMessageHandler:delegateController name:HFShare]; //注销协议 - (void)dealloc { [self.userContentController removeScriptMessageHandlerForName:HFAlert]; [self.userContentController removeScriptMessageHandlerForName:HFConfirm]; [self.userContentController removeScriptMessageHandlerForName:HFPrompt]; [self.userContentController removeScriptMessageHandlerForName:HFShare]; } //实施协议 - (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message { NSLog(@"%@", message.body); if ([message.name isEqualToString:HFAlert]) { // 打印所传过来的参数，只支持NSNumber, NSString, NSDate, NSArray, // NSDictionary, and NSNull类型 NSDictionary *dictionary = message.body; if (![dictionary isKindOfClass:[NSDictionary class]]) { return; } NSLog(@"%@",dictionary[@"body"]); //服务端传值 log dispatch_async(dispatch_get_main_queue(), ^{ //主线程操作UI }); } else if ([message.name isEqualToString:HFConfirm]) { } else if ([message.name isEqualToString:HFPrompt]) { } else if ([message.name isEqualToString:HFShare]) { } }
设置代理 WKDelegateController 重写成代理控制器性质，保证设置代理后，可移除 的关键！！！
// // WKDelegateController.m // SectionDemo // // Created by HF on 2017/6/22. // Copyright © 2017年 HF-Liqun. All rights reserved. // #import "WKDelegateController.h" @interface WKDelegateController () @end @implementation WKDelegateController - (void)viewDidLoad { [super viewDidLoad]; } - (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message{ if ([self.delegate respondsToSelector:@selector(userContentController:didReceiveScriptMessage:)]) { [self.delegate userContentController:userContentController didReceiveScriptMessage:message]; } } @end //////// // // WKDelegateController.h // SectionDemo // // Created by HF on 2017/6/22. // Copyright © 2017年 HF-Liqun. All rights reserved. // #import <UIKit/UIKit.h> #import <WebKit/WebKit.h> @protocol WKDelegate <NSObject> - (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message; @end @interface WKDelegateController : UIViewController <WKScriptMessageHandler> @property (weak , nonatomic) id < WKScriptMessageHandler > delegate; @end
(2)WKNavigationDelegate,举例子和UIWebView shouldStart 方法一样，在请求前判断要不要继续执行
// 在发送请求之前，决定是否跳转 - (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler { NSString *hostname = navigationAction.request.URL.host.lowercaseString; if (navigationAction.navigationType == WKNavigationTypeLinkActivated && ![hostname containsString:@".baidu.com"]) { // 对于跨域，需要手动跳转 [[UIApplication sharedApplication] openURL:navigationAction.request.URL]; // 不允许web内跳转 decisionHandler(WKNavigationActionPolicyCancel); } else { self.progressView.alpha = 1.0; decisionHandler(WKNavigationActionPolicyAllow); } NSLog(@"%s", __FUNCTION__); }
(3)WKUIDelegate 参考代码
#pragma mark - WKUIDelegate 这个协议主要用于WKWebView处理web界面的三种提示框(警告框、确认框、输入框) 的网页交互/** * web界面中有弹出警告框时调用 * * @param webView 实现该代理的webview * @param message 警告框中的内容 * @param frame 主窗口 * @param completionHandler 警告框消失调用 无回调 */ - (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler { NSLog(@"%s", __FUNCTION__); //completionHandler(@"空回调"); UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"alert" message:[NSString stringWithFormat:@"JS调用alert message:%@",message] preferredStyle:UIAlertControllerStyleAlert]; [alert addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) { completionHandler(); }]]; [self presentViewController:alert animated:YES completion:NULL]; NSLog(@"%@", message); } /** 确认框 @param webView 实现该代理的webview @param message 确认窗口内容 @param frame 主窗口 @param completionHandler 警告框消失调用 回传布尔变量 */ - (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL result))completionHandler { NSLog(@"%s", __FUNCTION__); //completionHandler(@"可以直接回传布尔变量"); UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"confirm" message:@"JS调用confirm" preferredStyle:UIAlertControllerStyleAlert]; [alert addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) { completionHandler(YES); }]]; [alert addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) { completionHandler(NO); }]]; [self presentViewController:alert animated:YES completion:NULL]; NSLog(@"%@", message); } /** 输入框 @param webView web @param prompt 文本 @param defaultText 默认输入文本 @param frame frame @param completionHandler completionHandler 回传 字符串 */ - (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(nullable NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * __nullable result))completionHandler { //completionHandler(@"可以直接回传字符串"); //可以根据回传参数来判断 是否必要展示 弹框，也可以隐式处理 根据当前参数判断回传指定逻辑参数 NSLog(@"%s", __FUNCTION__); NSLog(@"%@", prompt); if ([prompt isEqualToString:HFPrompt]) { completionHandler(@"guess"); return; } UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"textinput" message:@"JS调用输入框" preferredStyle:UIAlertControllerStyleAlert]; [alert addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) { textField.textColor = [UIColor redColor]; }]; [alert addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) { completionHandler([[alert.textFields lastObject] text]); }]]; [self presentViewController:alert animated:YES completion:NULL]; }
三.OC JS 互相调用
(1) OC 调用 JS 代码（OC注入JS）
NSString *js = @"alertName('我是参数')";//可以向js传参数
//NSString *js = @"callJsAlert()";//无参数方法 [self.webView evaluateJavaScript:js completionHandler:^(id _Nullable response, NSError * _Nullable error) { NSLog(@"response: %@ error: %@", response, error); NSLog(@"call js alert by native"); }];
(2) JS 调用 OC方法：关键是按照约定方法名和注册名
关键代码：
//name 为注册名 HFAlert HFPrompt ... messageBody 为传递参数集合 和 UIWebView的 调用OC 方法 是不一样的！！！！！ window.webkit.messageHandlers.<name>.postMessage(<messageBody>);
参考示例：
<!DOCTYPE html> <html> <head> <title>iOS and Js</title> <style type="text/css"> * { font-size: 40px; } </style> </head> <body> <div style="margin-top: 100px"> <h1>Test how to use objective-c call js</h1><br/><br/> <div><input type="button" value="call shareButton" onclick="shareClick()"></div> <br/><br/> <div><input type="button" value="call js alert" onclick="callJsAlert()"></div> <br/> <div><input type="button" value="Call js confirm" onclick="callJsConfirm()"></div><br/> </div> <br/> <div> <div><input type="button" value="Call Js prompt " onclick="callJsInput()"></div><br/> <div>Click me here: <a href="http://www.baidu.com">Jump to Baidu</a></div> </div> <br/> <div id="SwiftDiv"> <span id="jsParamFuncSpan" style="color: red; font-size: 50px;"></span> </div> <script type="text/javascript"> //JS执行window.webkit.messageHandlers.Share.postMessage(<messageBody>) function callJsAlert() { //WKUIDelegate 空回调 警告框代理被触发 alert('Objective-C call js to show alert'); // HFAlert是我们所注入的对象 window.webkit.messageHandlers.HFAlert.postMessage({body: 'call js alert in js'}); } function callJsConfirm() { //WKUIDelegate 布尔回调 选择确认框代理被触发 if (confirm('confirm', 'Objective-C call js to show confirm')) { document.getElementById('jsParamFuncSpan').innerHTML = 'true'; } else { document.getElementById('jsParamFuncSpan').innerHTML = 'false'; } //HFConfirm是我们所注入的对象 window.webkit.messageHandlers.HFConfirm.postMessage({body: 'call js confirm in js'}); } function callJsInput() { //WKUIDelegate 字符串回调 输入框代理被触发 var response = prompt('HFPrompt', 'Please input your name:'); document.getElementById('jsParamFuncSpan').innerHTML = response; //HFPrompt是我们所注入的对象 window.webkit.messageHandlers.HFPrompt.postMessage({body: response}); } function shareClick() { var response = prompt('Hello'); window.webkit.messageHandlers.HFShare.postMessage({body:response ,title:'测试分享的标题',content:'测试分享的内容',url:'https://github.com/maying1992'}); } function alertName(msg) { document.getElementById('jsParamFuncSpan').innerHTML = 'name' + msg + ', nice to meet you'; } </script> </body> </html>
end
参考
(1) http://www.tuicool.com/articles/qQRrMzY
(2)http://www.cocoachina.com/ios/20160906/17487.html
(3)http://www.jianshu.com/p/4fa8c4eb1316
(4)http://blog.csdn.net/u011619283/article/details/52135988