OC與JS的交互(WKWebview-MessageHandler實現(xiàn))

GitHub:https://github.com/1205665266/WKWebView

HTML代碼

<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf8">
            <script language="javascript">

            //JS執(zhí)行window.webkit.messageHandlers.Share.postMessage(<messageBody>)
            function shareClick() {
                window.webkit.messageHandlers.Share.postMessage({title:'測試分享的標題',content:'測試分享的內(nèi)容',url:'https://github.com/maying1992'});
            }
            
            //分享回調(diào)結(jié)果顯示
            function shareResult(channel_id,share_channel,share_url) {
                var content = channel_id+","+share_channel+","+share_url;
                alert(content);
                document.getElementById("returnValue").value = content;
            }
            
            //JS執(zhí)行window.webkit.messageHandlers.Camera.postMessage(<messageBody>)
            function cameraClick() {
                window.webkit.messageHandlers.Camera.postMessage(null);
            }
            
            //調(diào)用相冊回調(diào)結(jié)果顯示
            function cameraResult(result) {
                alert(result);
                document.getElementById("returnValue").value = result;
            }
            
        
                </script>
            </head>
    
    <body>
        <h1>這是按鈕調(diào)用</h1>
        <input type="button" value="分享" onclick="shareClick()" />
        <input type="button" value="相機" onclick="cameraClick()" />

        <h1>回調(diào)展示區(qū)</h1>
        <textarea id ="returnValue" type="value" rows="5" cols="40">
            
        </textarea>
    </body>
</html>

創(chuàng)建WKWebView代碼

//
//  BaseWebViewController.m
//  Capp
//
//  Created by apple on 2017/10/18.
//  Copyright ? 2017年 apple. All rights reserved.
//

#import "BaseWebViewController.h"
#import <WebKit/WebKit.h>

@interface BaseWebViewController ()<WKNavigationDelegate,WKUIDelegate,WKScriptMessageHandler>

@end

@implementation BaseWebViewController
{
    WKWebView *_webView;
}

- (void)dealloc {
    
    NSLog(@"web 走了 dealloc");
    //這里remove掉 添加的js標識
    [[_webView configuration].userContentController removeScriptMessageHandlerForName:@"Camera"];
}

- (void)viewDidLoad {
    [super viewDidLoad];
    //技術(shù)文檔    
    self.view.backgroundColor = [UIColor whiteColor];
    self.navigationItem.title = self.titleStr;
    [self setupUI];

}

//導(dǎo)航左返回
-(void)leftBarButtonAction
{
    if (_webView.canGoBack) {
        [_webView goBack];
    }else{
        [self.navigationController popViewControllerAnimated:YES];
    }
}

- (void)setupUI {
    
    WKWebViewConfiguration *configuration = [[WKWebViewConfiguration alloc] init];
    WKUserContentController *userContentController = [[WKUserContentController alloc] init];
    //這里add 添加的js標識  用于處理接受的js通知做判斷
    [userContentController addScriptMessageHandler:self name:@"Camera"];
    
    configuration.userContentController = userContentController;
    
    _webView = [[WKWebView alloc] initWithFrame:CGRectMake(0, 0, kWIDTH, kHEIGHT-64) configuration:configuration];
    
    //    _webView = [[WKWebView alloc] initWithFrame:CGRectMake(0, 0, kWIDTH, kHEIGHT-64)];
    _webView.navigationDelegate = self;
    _webView.UIDelegate = self;
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:self.urlStr]];
    [_webView loadRequest:request];
    _webView.backgroundColor = [UIColor whiteColor];
    [self.view addSubview:_webView];
    [_webView setOpaque:NO];
}

#pragma mark - UIWebViewDelegate   uiwebview代理方法
- (void)webViewDidStartLoad:(UIWebView *)webView {
    [_progressLayer startLoad];
}

- (void)webViewDidFinishLoad:(UIWebView *)webView {
    [_progressLayer finishedLoad];
    //自動獲取  webView的title
//    self.navigationItem.title = [webView stringByEvaluatingJavaScriptFromString:@"document.title"];
}

- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {
    [_progressLayer finishedLoad];
}

-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
    //    NSLog(@"request.URL---%@",request.URL);
    //    NSLog(@"request.description(str)---%@",request.description);
    //點擊
    if (navigationType == UIWebViewNavigationTypeLinkClicked) {
        
    }
    return YES;
}

#pragma mark <WKNavigationDelegate>   WKWebView代理方法
// 頁面開始加載時調(diào)用
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(null_unspecified WKNavigation *)navigation
{
   
}

// 頁面加載完成之后調(diào)用
- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation
{
    //自動獲取  webView的title
//    self.navigationItem.title = webView.title;
}

//頁面加載失敗時 調(diào)用
- (void)webView:(WKWebView *)webView didFailNavigation:(WKNavigation *)navigation withError:(NSError *)error
{
   
}

// 接收到服務(wù)器跳轉(zhuǎn)請求之后調(diào)用
- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(WKNavigation *)navigation
{
    NSLog(@"=======接收到服務(wù)器跳轉(zhuǎn)請求之后調(diào)用======");
}

/**
 *  在發(fā)送請求之前椒舵，決定是否跳轉(zhuǎn)
 *
 *  @param webView          實現(xiàn)該代理的webview
 *  @param navigationAction 當前navigation
 *  @param decisionHandler  是否調(diào)轉(zhuǎn)block
 */
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler
{
    NSLog(@"````````````在發(fā)送請求之前，決定是否跳轉(zhuǎn)```````````");
    NSLog(@"IP地址=======%@", navigationAction.request.URL.host.lowercaseString);
    NSLog(@"======request.URL.absoluteString---%@",navigationAction.request.URL.absoluteString);
    NSLog(@"======request.description(str)---%@",navigationAction.request.description);
    if ([navigationAction.request.URL.absoluteString containsString:@"collectionStore"]) {//
        
        //在這里做特定的操作
        decisionHandler(WKNavigationActionPolicyCancel);
    }else{
        decisionHandler(WKNavigationActionPolicyAllow);
    }
}

/**
 *  在收到響應(yīng)后优俘，決定是否跳轉(zhuǎn)
 *
 *  @param webView            實現(xiàn)該代理的webview
 *  @param navigationResponse 當前navigation
 *  @param decisionHandler    是否跳轉(zhuǎn)block
 */
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler
{
    NSLog(@"============在收到響應(yīng)后镇防，決定是否跳轉(zhuǎn)========");
    NSLog(@"IP地址=======%@", navigationResponse.response.URL.host.lowercaseString);
    NSLog(@"request.URL.absoluteString---%@",navigationResponse.response.URL.absoluteString);
    NSLog(@"request.description(str)---%@",navigationResponse.response.description);
    decisionHandler(WKNavigationResponsePolicyAllow);
}

#pragma mark - WKUIDelegate
- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler
{
    
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提醒" message:message preferredStyle:UIAlertControllerStyleAlert];
    [alert addAction:[UIAlertAction actionWithTitle:@"知道了" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
        completionHandler();
    }]];
    
    [self presentViewController:alert animated:YES completion:nil];
}

#pragma mark - WKScriptMessageHandler
- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message
{
    NSLog(@"message.name:%@", message.name);
    NSLog(@"message.body:%@", message.body);
    
    //根據(jù)添加的js標識   做特定的操作
    if ([message.name isEqualToString:@"Camera"]) {
        
    }
    if ([message.name isEqualToString:@"ShowMessageFromWKWebView"]) {
        //        [self showMessageWithParams:message.body];
    }
}

#pragma mark - OC傳數(shù)據(jù)給JS
- (void)showMessageWithParams:(NSDictionary *)dict {
    
    if (![dict isKindOfClass:[NSDictionary class]]) {
        return;
    }
    
    // 將結(jié)果返回給js  oc調(diào)用js   
    //注:showMessageResult('%@')", @"message傳到OC成功,oc傳數(shù)據(jù)給js"
    //showMessageResult是js的方法名
    // ('%@') 是 傳給js的參數(shù)
    NSString *returnJSStr = [NSString stringWithFormat:@"showMessageResult('%@')", @"message傳到OC成功,oc傳數(shù)據(jù)給js"];
    [_webView evaluateJavaScript:returnJSStr completionHandler:^(id _Nullable result, NSError * _Nullable error) {
        
        NSLog(@"oc調(diào)用js回調(diào),,result==%@,error==%@", result, error);
    }];
}

@end