iOS WKwebView和js交互

1.浏览web页面,点击某个方法,并传值给oc原生,原生界面做出响应.

     使用场景: 浏览web页面商品,点击查看详情,进入原生界面浏览商品详情.

     直接看代码:

#import

#import

@interface ViewController ()


@property (nonatomic, strong) WKWebView *webView;


@end


@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    self.view .backgroundColor =[UIColor whiteColor];

    

    WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];

    config.preferences = [[WKPreferences alloc] init];

    config.preferences.minimumFontSize = 10;

    config.preferences.javaScriptEnabled = YES;

    config.preferences.javaScriptCanOpenWindowsAutomatically = NO;

    config.userContentController = [[WKUserContentController alloc] init];

    config.processPool = [[WKProcessPool alloc] init];

    self.webView = [[WKWebView alloc] initWithFrame:self.view.bounds

                                      configuration:config];

    //记得实现对应协议,不然方法不会实现.

    self.webView.UIDelegate = self;

    self.webView.navigationDelegate =self;

    [self.view addSubview:self.webView];

    [self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://192.168.1.188/index1.html"]]];

    

    // **************** 此处划重点 **************** //

    //添加注入js方法, oc与js端对应实现

    [config.userContentController addScriptMessageHandler:self name:@"collectSendKey"];

    [config.userContentController addScriptMessageHandler:self name:@"collectIsLogin"];

    //js端代码实现实例(此处为js端实现代码给大家粘出来示范的!!!):

    //window.webkit.messageHandlers.collectSendKey.postMessage({body: 'goodsId=1212'});


}

#pragma mark - WKScriptMessageHandler

//实现js注入方法的协议方法

- (void)userContentController:(WKUserContentController *)userContentController

      didReceiveScriptMessage:(WKScriptMessage *)message {

    //找到对应js端的方法名,获取messge.body

    if ([message.name isEqualToString:@"collectSendKey"]) {


        NSLog(@"%@", message.body);

       

    }

}

     2.浏览web页面,传递值给js界面,js界面通过值判断处理逻辑.

     使用场景: 浏览web页面商品,加入购物车,js通过oc原生传递过去的userId是否为空,来判断当前app是否登录,未登录,跳转原生界面登录,已登录,则直接加入购物车

     直接放代码:

#pragma mark ---------  WKNavigationDelegate  --------------

// 加载成功,传递值给js

- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation

{

    //获取userId

    //传递userId给 js端

   NSString * userId = DEF_GET_OBJECT(UserID);

   NSString * jsUserId;

    if (!userId) {

        jsUserId =@"";

    }else{

        jsUserId =userId;

    }

    //之所以给userId重新赋值,貌似是如果userId为空null 那么传给js端,js说无法判断,只好说,如果userId为null,重新定义为空字符串.如果大家有好的建议,可以在下方留言.   

    //同时,这个地方需要注意的是,js端并不能查看我们给他传递的是什么值,也无法打印,貌似是语言问题? 还是js骗我文化低,反正,咱们把值传给他,根据双方商量好的逻辑,给出判断,如果正常,那就ok了.

    NSString * jsStr  =[NSString stringWithFormat:@"sendKey('%@')",jsUserId];

    [self.webView evaluateJavaScript:jsStr completionHandler:^(id _Nullable result, NSError * _Nullable error) {

  //此处可以打印error.

    }];

   //js端获取传递值代码实现实例(此处为js端实现代码给大家粘出来示范的!!!):

    //function sendKey(user_id){


           $("#input").val(user_id);
       }

 


}
//依然是这个协议方法,获取注入方法名对象,获取js返回的状态值.

#pragma mark - WKScriptMessageHandler

- (void)userContentController:(WKUserContentController *)userContentController

      didReceiveScriptMessage:(WKScriptMessage *)message {


//js端判断如果userId为空,则返回字符串@"toLogin"  ,或者返回其它值.  js端代码实现实例(此处为js端实现代码给大家粘出来示范的!!!):

function collectIsLogin(goods_id){

                                   if (/(iPhone|iPad|iPod|iOS)/i.test(navigator.userAgent)) {


   try {


      if( $("#input").val()){
                                           
                                            window.webkit.messageHandlers.collectGzhu.postMessage({body: "'"+goods_id+"'"});
                    

        }else {
                                            window.webkit.messageHandlers.collectGzhu.postMessage({body: 'toLogin'});
                  

   }


                                   }catch (e){
                                        //浏览器
                                        alert(e);
                                    }

//oc原生处理:


    if ([message.name isEqualToString:@"collectIsLogin"]) {


       NSDictionary * messageDict = (NSDictionary *)message.body;

        if ([messageDict[@"body"] isEqualToString:@"toLogin"]) {

            NSLog(@"登录");

           

            

            

        }else{

            NSLog(@"正常跳转");

            NSLog(@"mess --- id == %@",message.body);

            

        }

    }

}

    3.在交互中,关于alert (单对话框)函数、confirm(yes/no对话框)函数、prompt(输入型对话框)函数时,实现代理协议 WKUIDelegate ,则系统方法里有三个对应的协议方法.大家可以进入WKUIDelegate 协议类里面查看.下面具体协议方法实现,也给大家粘出来,以供参考.

#pragma mark - WKUIDelegate

- (void)webViewDidClose:(WKWebView *)webView {

    NSLog(@"%s", __FUNCTION__);

}

// 在JS端调用alert函数时,会触发此代理方法。

// JS端调用alert时所传的数据可以通过message拿到

// 在原生得到结果后,需要回调JS,是通过completionHandler回调

- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler {

    NSLog(@"%s", __FUNCTION__);

    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"alert" message:@"JS调用alert" preferredStyle:UIAlertControllerStyleAlert];

    [alert addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

        completionHandler();

    }]];

    

    [self presentViewController:alert animated:YES completion:NULL];

    NSLog(@"%@", message);

}


// JS端调用confirm函数时,会触发此方法

// 通过message可以拿到JS端所传的数据

// 在iOS端显示原生alert得到YES/NO后

// 通过completionHandler回调给JS端

- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL result))completionHandler {

    NSLog(@"%s", __FUNCTION__);

    

    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);

}


// JS端调用prompt函数时,会触发此方法

// 要求输入一段文本

// 在原生输入得到文本内容后,通过completionHandler回调给JS

- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(nullable NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * __nullable result))completionHandler {

    NSLog(@"%s", __FUNCTION__);

    

    NSLog(@"%@", prompt);

    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];

}
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原文:https://blog.csdn.net/one_person_one_life/article/details/78563205  
 

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