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iOS WKWebView OC 與 JS 交互學習

我寫WKWebView 想讓服務端相應一個方法但是不響應，根據 UIWebView 用 JSContext就能拿到響應的處理經驗是不是服務端也需要對 WKwebView有兼容的一個寫法？？？特此學習 WKWebView 記錄

一 .WKWebView 代理協議

(1)WKScriptMessageHandler :

OC在JS調用方法時做的處理。如果需要調用對話窗口就會先執行（3）協議再執行（1）協議

好處：傳遞給OC的參數直接在字典里面，不用再在url里面拼湊后的結果去截取解析。

必須實現

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

(2)WKNavigationDelegate:

處理頁面跳轉和載入過程。

#pragma mark -- 進行頁面跳轉

// 接收到服務器跳轉請求之后再執行
- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(null_unspecified WKNavigation *)navigation;
// 在發送請求之前，決定是否跳轉
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler ;
// 在收到響應后，決定是否跳轉
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler ;

#pragma mark -- 追蹤加載過程

// 頁面開始加載時調用
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(null_unspecified WKNavigation *)navigation;

// 當內容開始返回時調用
- (void)webView:(WKWebView *)webView didCommitNavigation:(null_unspecified WKNavigation *)navigation;
// 頁面加載完成之后調用
- (void)webView:(WKWebView *)webView didFinishNavigation:(null_unspecified WKNavigation *)navigation;
// 頁面加載失敗時調用
- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error;

//好多協議 按需添加。。。

(3)WKUIDelegate

這個協議主要用于WKWebView處理web界面的三種提示框(警告框、確認框、輸入框) 的網頁交互

#pragma mark - WKUIDelegate
//警告
- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler；
//確認
- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL result))completionHandler;
// 輸入框
- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(nullable NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * __nullable result))completionHandler；

二.協議使用

(1)WKScriptMessageHandler ,關鍵在當前頁面銷毀后要注銷協議保證無強引用，當前頁面也無法銷毀，發生內存泄漏。

//注冊協議
    self.userContentController = [[WKUserContentController alloc] init];
    //注冊方法
    WKDelegateController *delegateController = [[WKDelegateController alloc]init];
    delegateController.delegate = self;
    
    // 通過JS與webview內容交互
    config.userContentController = self.userContentController;
    // 注入JS對象名稱HFAlert，HFConfirm,HFPrompt當JS通過HFAlert，HFConfirm,HFPrompt來調用時，
    // 我們可以在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];
//注銷協議
- (void)dealloc
{
    [self.userContentController removeScriptMessageHandlerForName:HFAlert];
    [self.userContentController removeScriptMessageHandlerForName:HFConfirm];
    [self.userContentController removeScriptMessageHandlerForName:HFPrompt];
    [self.userContentController removeScriptMessageHandlerForName:HFShare];
}
//實施協議
- (void)userContentController:(WKUserContentController *)userContentController
      didReceiveScriptMessage:(WKScriptMessage *)message {
    NSLog(@"%@", message.body);
    if ([message.name isEqualToString:HFAlert]) {
        // 打印所傳過來的參數，只支持NSNumber, NSString, NSDate, NSArray,
        // NSDictionary, and NSNull類型
        NSDictionary *dictionary = message.body;
        if (![dictionary isKindOfClass:[NSDictionary class]]) {
            return;
        }
        NSLog(@"%@",dictionary[@"body"]); //服務端傳值 log
        dispatch_async(dispatch_get_main_queue(), ^{
            //主線程操作UI
        });
    } else if ([message.name isEqualToString:HFConfirm]) {
        
    } else if ([message.name isEqualToString:HFPrompt]) {
        
    } else if ([message.name isEqualToString:HFShare]) {
    
    }
}

設置代理 WKDelegateController 重寫成代理控制器性質，保證設置代理后，可移除 的關鍵！！！

//
//  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,舉例子和UIWebView shouldStart 方法一樣，在請求前判斷要不要繼續執行

// 在發送請求之前，決定是否跳轉
- (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"]) {
        // 對于跨域，需要手動跳轉
        [[UIApplication sharedApplication] openURL:navigationAction.request.URL];
        
        // 不允許web內跳轉
        decisionHandler(WKNavigationActionPolicyCancel);
    } else {
        self.progressView.alpha = 1.0;
        decisionHandler(WKNavigationActionPolicyAllow);
    }
    NSLog(@"%s", __FUNCTION__);
}

(3)WKUIDelegate 參考代碼

#pragma mark - WKUIDelegate 這個協議主要用于WKWebView處理web界面的三種提示框(警告框、確認框、輸入框) 的網頁交互/**
 *  web界面中有彈出警告框時調用
 *
 *  @param webView           實現該代理的webview
 *  @param message           警告框中的內容
 *  @param frame             主窗口
 *  @param completionHandler 警告框消失調用 無回調
 */

- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler {
    NSLog(@"%s", __FUNCTION__);
    //completionHandler(@"空回調");
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"alert" message:[NSString stringWithFormat:@"JS調用alert message:%@",message] preferredStyle:UIAlertControllerStyleAlert];
    [alert addAction:[UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        completionHandler();
    }]];
    
    [self presentViewController:alert animated:YES completion:NULL];
    NSLog(@"%@", message);
}


/**
 確認框
 
 @param webView 實現該代理的webview
 @param message 確認窗口內容
 @param frame 主窗口
 @param completionHandler 警告框消失調用 回傳布爾變量
 */
- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL result))completionHandler {
    NSLog(@"%s", __FUNCTION__);
    
    //completionHandler(@"可以直接回傳布爾變量");
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"confirm" message:@"JS調用confirm" preferredStyle:UIAlertControllerStyleAlert];
    [alert addAction:[UIAlertAction actionWithTitle:@"確定" 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);
}


/**
 輸入框
 
 @param webView web
 @param prompt 文本
 @param defaultText 默認輸入文本
 @param frame frame
 @param completionHandler completionHandler  回傳 字符串
 */
- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(nullable NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * __nullable result))completionHandler {
    
    //completionHandler(@"可以直接回傳字符串");
    //可以根據回傳參數來判斷 是否必要展示 彈框，也可以隱式處理 根據當前參數判斷回傳指定邏輯參數
    NSLog(@"%s", __FUNCTION__);
    NSLog(@"%@", prompt);
    if ([prompt isEqualToString:HFPrompt]) {
        completionHandler(@"guess");
        return;
    }
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"textinput" message:@"JS調用輸入框" preferredStyle:UIAlertControllerStyleAlert];
    [alert addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
        textField.textColor = [UIColor redColor];
    }];
    
    [alert addAction:[UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        completionHandler([[alert.textFields lastObject] text]);
    }]];
    
    [self presentViewController:alert animated:YES completion:NULL];
}

三.OC JS 互相調用

(1) OC 調用 JS 代碼（OC注入JS）

        NSString *js = @"alertName('我是參數')";//可以向js傳參數
        //NSString *js = @"callJsAlert()";//無參數方法
        [self.webView evaluateJavaScript:js completionHandler:^(id _Nullable response, NSError * _Nullable error) {
            NSLog(@"response: %@ error: %@", response, error);
            NSLog(@"call js alert by native");
        }];

(2) JS 調用 OC方法：關鍵是按照約定方法名和注冊名

關鍵代碼：

//name 為注冊名 HFAlert HFPrompt ...  messageBody 為傳遞參數集合 和 UIWebView的 調用OC 方法 是不一樣的！！！！！
window.webkit.messageHandlers.<name>.postMessage(<messageBody>);

參考示例：

<!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執行window.webkit.messageHandlers.Share.postMessage(<messageBody>)
      function callJsAlert() {
        //WKUIDelegate 空回調 警告框代理被觸發
        alert('Objective-C call js to show alert');
        // HFAlert是我們所注入的對象
        window.webkit.messageHandlers.HFAlert.postMessage({body: 'call js alert in js'});
      }
    
      function callJsConfirm() {
        //WKUIDelegate 布爾回調 選擇確認框代理被觸發
        if (confirm('confirm', 'Objective-C call js to show confirm')) {
        document.getElementById('jsParamFuncSpan').innerHTML
        = 'true';
      } else {
        document.getElementById('jsParamFuncSpan').innerHTML
        = 'false';
      }
      
      //HFConfirm是我們所注入的對象
      window.webkit.messageHandlers.HFConfirm.postMessage({body: 'call js confirm in js'});
    }
    
    function callJsInput() {
      //WKUIDelegate 字符串回調 輸入框代理被觸發
      var response = prompt('HFPrompt', 'Please input your name:');
      document.getElementById('jsParamFuncSpan').innerHTML = response;
      
       //HFPrompt是我們所注入的對象
      window.webkit.messageHandlers.HFPrompt.postMessage({body: response});
    }
    
    function shareClick() {
        var response = prompt('Hello');
        window.webkit.messageHandlers.HFShare.postMessage({body:response ,title:'測試分享的標題',content:'測試分享的內容',url:'https://github.com/maying1992'});
    }

    function alertName(msg) {
        document.getElementById('jsParamFuncSpan').innerHTML = 'name' + msg + ', nice to meet you';
    }
      </script>
  </body>
</html>

end

參考

(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

posted on 2017-06-22 18:02 ACM_Someone like you 閱讀(6536) 評論(0) 收藏舉報

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