iOS用WKWebView与JS交互获取系统图片及WKWebView的Alert,Confirm,TextInput的监听代理方法使用，屏蔽WebView的可选菜单

来源：互联网发布：php一键安装源码编辑：程序博客网时间：2024/06/05 01:49

最近做一个项目，开始是使用WebView与JS交互的，由于内存管理方面WebView欠佳。WKWebVIew的内存线程管理好，所以选择使用 WKWebVIew(使用WKWebView 的缺点在于，这个控件加载的H5页面不支持ajax请求，所以需要自己把网络请求在OC上实现)。

一、首先说下应该注意的问题：

1.要获取拍照或相册的图片，如果是iOS 10系统，需要设置访问权限（在 Info-plist 中设置）

相机权限： Privacy - Camera Usage Description 是否允许此App使用你的相机？
相册权限： Privacy - Photo Library Usage Description 是否允许此App访问你的媒体资料库？

2.WebView和WKWebView和JS互调的方法和使用的传参类型不同

WebView 使用（window.iosModel.getImage(JSON.stringify(parameter)); //JSON.stringify(参数字符串) 这个方法是把字符串转换成json字符串 parameter是参数字符串
）传值给 OC

WKWebView 使用（window.webkit.messageHandlers.iosModel.postMessage(parameter)）

3.需要特别注意的是：WKWebView 不执行JS写的 ajax请求（WKWebView 可能由于基于 WebKit，并不会执行 C socket 相关的函数对 HTTP 请求进行处理）如果有网络请求，需要自己用OC实现

4.使用的时候不要忘记挂上使用到的代理，和导入代理

@interface ViewController () <WKScriptMessageHandler, WKNavigationDelegate, WKUIDelegate,UINavigationControllerDelegate,UIImagePickerControllerDelegate>

5.屏蔽WebView的可选菜单（即不会出现拷贝、全选等弹出菜单）在加载完成后的代理中执行以下两段JS

// 导航完成时，会回调（也就是页面载入完成了）- (void)webView:(WKWebView *)webView didFinishNavigation:(null_unspecified WKNavigation *)navigation {    NSLog(@"66===%s", __FUNCTION__);    // 禁用选中效果    [self.webView evaluateJavaScript:@"document.documentElement.style.webkitUserSelect='none'" completionHandler:nil];    [self.webView evaluateJavaScript:@"document.documentElement.style.webkitTouchCallout='none'" completionHandler:nil];}

二、代码：

<!DOCTYPE html><html><head><meta charset="UTF-8"><title></title></head><body><div>            <h3>JS与iOS交互</h3>            <h4>JS页面获取iOS系统图片</h5>        </div><div><input type = "button" style="width: 50%;height: 5%;" id="Button" value="打开相机获取图片" onclick="getIOSImage()"></button></div><dir /><div><img src="testImage.png" id="changeImage"style="width: 30%; height: 30%;" onclick="getIOSImage()"><!--src="图片的相对路径" 如果把html文件导入工程中，图片路径和OC一样只写图片名字和后缀就可以，（记得要先把图片添加到工程） 图片也可以实现按钮的方法getIOSImage --></div>        <span id="iosParame" style="width: 200px; height: 50%; color:orangered; font-size:15px" value="等待获取ios参数" >            </div><script>var getIOSImage = function(){var parameter = {'title':'JS调OC','describe':'这里就是JS传给OC的参数'};// 在下面这里实现js 调用系统原生api iosDelegate                //JSON.stringify(参数字符串) 这个方法是 把字符串转换成json字符串window.iosDelegate.getImage(JSON.stringify(parameter));// 实现数据的 json 格式字符串}        // 这里是 iOS调用js的方法        function setImageWithPath(arguments){            document.getElementById('changeImage').src = arguments['imagePath'];            document.getElementById('iosParame').innerHTML = arguments['iosContent'];        }</script></body></html>

<pre name="code" class="objc">#import "ViewController.h"#import <JavaScriptCore/JavaScriptCore.h>#import <WebKit/WebKit.h>#import "SaveImage_Util.h"@interface ViewController () <WKScriptMessageHandler, WKNavigationDelegate, WKUIDelegate,UINavigationControllerDelegate,UIImagePickerControllerDelegate>@property (nonatomic, strong) WKWebView *webView;@property (nonatomic, strong) UIProgressView *progressView;@end@implementation ViewController{    int indextNumb;// 交替图片名字    UIImage *getImage;//获取的图片}- (void)viewDidLoad {  [super viewDidLoad];    self.edgesForExtendedLayout = UIRectEdgeNone;  self.automaticallyAdjustsScrollViewInsets = NO;    WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];  // 设置偏好设置  config.preferences = [[WKPreferences alloc] init];  // 默认为0  config.preferences.minimumFontSize = 10;  // 默认认为YES  config.preferences.javaScriptEnabled = YES;  // 在iOS上默认为NO，表示不能自动通过窗口打开  config.preferences.javaScriptCanOpenWindowsAutomatically = NO;  // web内容处理池  config.processPool = [[WKProcessPool alloc] init];  // 通过JS与webview内容交互  config.userContentController = [[WKUserContentController alloc] init];  // 注入JS对象名称AppModel，当JS通过AppModel来调用时，  // 我们可以在WKScriptMessageHandler代理中接收到  [config.userContentController addScriptMessageHandler:self name:@"iosModel"];        //通过默认的构造器来创建对象  self.webView = [[WKWebView alloc] initWithFrame:self.view.bounds configuration:config];    // 导航代理    self.webView.navigationDelegate = self;    // 与webview UI交互代理    self.webView.UIDelegate = self;  NSURL *path = [[NSBundle mainBundle] URLForResource:@"testJS" withExtension:@"html"];  [self.webView loadRequest:[NSURLRequest requestWithURL:path]];  [self.view addSubview:self.webView];      // 添加KVO监听  [self.webView addObserver:self                 forKeyPath:@"loading"                    options:NSKeyValueObservingOptionNew                    context:nil];  [self.webView addObserver:self                 forKeyPath:@"title"                    options:NSKeyValueObservingOptionNew                    context:nil];  [self.webView addObserver:self                 forKeyPath:@"estimatedProgress"                    options:NSKeyValueObservingOptionNew                    context:nil];  // 添加进入条  self.progressView = [[UIProgressView alloc] init];  self.progressView.frame = self.view.bounds;  [self.view addSubview:self.progressView];  self.progressView.backgroundColor = [UIColor blackColor];    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"后退" style:UIBarButtonItemStyleDone target:self action:@selector(goback)];  self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"前进" style:UIBarButtonItemStyleDone target:self action:@selector(gofarward)];}- (void)goback {  if ([self.webView canGoBack]) {    [self.webView goBack];  }}- (void)gofarward {  if ([self.webView canGoForward]) {    [self.webView goForward];  }}#pragma mark - WKScriptMessageHandler// 通过这个方法获取 JS传来的json字符串- (void)userContentController:(WKUserContentController *)userContentController      didReceiveScriptMessage:(WKScriptMessage *)message{  if ([message.name isEqualToString:@"iosModel"]) {    // 打印所传过来的参数，只支持NSNumber, NSString, NSDate, NSArray,    // NSDictionary, and NSNull类型      NSLog(@"JS传来的json字符串 ：  %@", message.body);      NSDictionary *jsDictionary = message.body;      if ([jsDictionary[@"means"] isEqualToString:@"获取系统图片"])      {          [self beginOpenPhoto];      }  }}#pragma mark - KVO- (void)observeValueForKeyPath:(NSString *)keyPath                      ofObject:(id)object                        change:(NSDictionary<NSString *,id> *)change                       context:(void *)context {  if ([keyPath isEqualToString:@"loading"]) {    NSLog(@"loading");  } else if ([keyPath isEqualToString:@"title"]) {    self.title = self.webView.title;  } else if ([keyPath isEqualToString:@"estimatedProgress"]) {    NSLog(@"progress: %f", self.webView.estimatedProgress);    self.progressView.progress = self.webView.estimatedProgress;  }  if (!self.webView.loading) {    [UIView animateWithDuration:0.5 animations:^{      self.progressView.alpha = 0;    }];  }}#pragma mark - WKNavigationDelegate    // 请求开始前，会先调用此代理方法    // 与UIWebView的    // - (BOOL)webView:(UIWebView *)webView    // shouldStartLoadWithRequest:(NSURLRequest *)request    // navigationType:(UIWebViewNavigationType)navigationType;    // 类型，在请求先判断能不能跳转（请求）- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {  NSString *hostname = navigationAction.request.URL.host.lowercaseString;  if (navigationAction.navigationType == WKNavigationTypeLinkActivated      && ![hostname containsString:@".lanou.com"]) {// 对于跨域，需要手动跳转， 用系统浏览器（Safari）打开    [[UIApplication sharedApplication] openURL:navigationAction.request.URL];        // 不允许web内跳转    decisionHandler(WKNavigationActionPolicyCancel);  } else {    self.progressView.alpha = 1.0;    decisionHandler(WKNavigationActionPolicyAllow);  }  }    // 在响应完成时，会回调此方法    // 如果设置为不允许响应，web内容就不会传过来- (void)webView:(WKWebView *)webViewdecidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponsedecisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler {  decisionHandler(WKNavigationResponsePolicyAllow);  }// 开始导航跳转时会回调- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(null_unspecified WKNavigation *)navigation {   }    // 接收到重定向时会回调- (void)webView:(WKWebView *)webViewdidReceiveServerRedirectForProvisionalNavigation:(null_unspecified WKNavigation *)navigation {   }    // 导航失败时会回调- (void)webView:(WKWebView *)webViewdidFailProvisionalNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error {    }// 页面内容到达main frame时回调- (void)webView:(WKWebView *)webView didCommitNavigation:(null_unspecified WKNavigation *)navigation {    }// 导航完成时，会回调（也就是页面载入完成了）- (void)webView:(WKWebView *)webView didFinishNavigation:(null_unspecified WKNavigation *)navigation {    NSLog(@"66===%s", __FUNCTION__);    // 禁用选中效果    [self.webView evaluateJavaScript:@"document.documentElement.style.webkitUserSelect='none'" completionHandler:nil];    [self.webView evaluateJavaScript:@"document.documentElement.style.webkitTouchCallout='none'" completionHandler:nil];}    // 导航失败时会回调- (void)webView:(WKWebView *)webView didFailNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error{    }/* 对于HTTPS的都会触发此代理，如果不要求验证，传默认就行    如果需要证书验证，与使用AFN进行HTTPS证书验证是一样的 */- (void)webView:(WKWebView *)webView didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition,          NSURLCredential *__nullable credential))completionHandler{  completionHandler(NSURLSessionAuthChallengePerformDefaultHandling, nil);}// 9.0才能使用，web内容处理中断时会触发/*- (void)webViewWebContentProcessDidTerminate:(WKWebView *)webView {}*/#pragma mark - WKUIDelegate- (void)webViewDidClose:(WKWebView *)webView {    }/* 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 *)messageinitiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler{  UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"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); }    // 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 *)webViewrunJavaScriptConfirmPanelWithMessage:(NSString *)messageinitiatedByFrame:(WKFrameInfo *)framecompletionHandler:(void (^)(BOOL result))completionHandler {  UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"confirm" message:message 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 *)webViewrunJavaScriptTextInputPanelWithPrompt:(NSString *)prompt    defaultText:(nullable NSString *)defaultTextinitiatedByFrame:(WKFrameInfo *)framecompletionHandler:(void (^)(NSString * __nullable result))completionHandler{  UIAlertController *alert = [UIAlertController alertControllerWithTitle:prompt message:defaultText 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];}//  获取图片- (void)beginOpenPhoto{    // 主队列 异步打开相机    dispatch_async(dispatch_get_main_queue(), ^{        [self takePhoto];    });}#pragma mark 取消选择照片代理方法- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{    [picker dismissViewControllerAnimated:YES completion:nil];}#pragma mark      //打开本地照片- (void) localPhoto{    UIImagePickerController *imagePicker = [[UIImagePickerController alloc]init];    imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;    imagePicker.delegate = self;    [self presentViewController:imagePicker animated:YES completion:nil];}#pragma mark      //打开相机拍照- (void) takePhoto{    UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypeCamera;    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])    {        UIImagePickerController *picker = [[UIImagePickerController alloc]init];        picker.delegate = self;        picker.allowsEditing = YES;        picker.sourceType = sourceType;        picker.modalTransitionStyle = UIModalTransitionStyleCoverVertical;        [self presentViewController:picker animated:YES completion:nil];    }    else    {        NSLog(@"模拟器中不能打开相机");        [self localPhoto];    }}//  选择一张照片后进入这里- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{    NSString *type = [info objectForKey:UIImagePickerControllerMediaType];    //  当前选择的类型是照片    if ([type isEqualToString:@"public.image"])    {        // 获取照片        getImage = [info objectForKey:@"UIImagePickerControllerOriginalImage"];        NSLog(@"===Decoded image size: %@", NSStringFromCGSize(getImage.size));        // obtainImage 压缩图片 返回原尺寸        indextNumb = indextNumb == 1?2:1;        NSString *nameStr = [NSString stringWithFormat:@"Varify%d.jpg",indextNumb];        [SaveImage_Util saveImage:getImage ImageName:nameStr back:^(NSString *imagePath) {            dispatch_async(dispatch_get_main_queue(), ^{                NSLog(@"图片路径：%@",imagePath);                /**                 *  这里是IOS 调 js 其中 setImageWithPath 就是js中的方法 setImageWithPath(),参数是字典                 */                NSString *callJSString = [NSString stringWithFormat:@"%@({\"imagePath\":\"%@\",\"iosContent\":\"获取图片成功，把系统获取的图片路径传给js 让html显示\"})",@"setImageWithPath",imagePath];                [self.webView evaluateJavaScript:callJSString completionHandler:^(id resultObject, NSError * _Nullable error) {                    if (!error)                    {                        NSLog(@"OC调 JS成功");                    }                    else                    {                        NSLog(@"OC调 JS 失败");                    }                }];            });        }];        [picker dismissViewControllerAnimated:YES completion:nil];    }}@end

下面是图片处理的工具类

//  SaveImage_Util.h//  JS和iOS交互////  Created by user on 16/10/14.//  Copyright © 2016年 user. All rights reserved.//#import <Foundation/Foundation.h>#import <UIKit/UIKit.h>@interface SaveImage_Util : NSObject#pragma mark  保存图片到document+ (BOOL)saveImage:(UIImage *)saveImage ImageName:(NSString *)imageName back:(void(^)(NSString *imagePath))back;@end

//  SaveImage_Util.m//  JS和iOS交互////  Created by user on 16/10/14.//  Copyright © 2016年 user. All rights reserved.//#import "SaveImage_Util.h"@implementation SaveImage_Util#pragma mark  保存图片到document+ (BOOL)saveImage:(UIImage *)saveImage ImageName:(NSString *)imageName back:(void(^)(NSString *imagePath))back{    NSString *path = [SaveImage_Util getImageDocumentFolderPath];    NSData *imageData = UIImagePNGRepresentation(saveImage);    NSString *documentsDirectory = [NSString stringWithFormat:@"%@/", path];    // Now we get the full path to the file    NSString *imageFile = [documentsDirectory stringByAppendingPathComponent:imageName];    // and then we write it out    NSFileManager *fileManager = [NSFileManager defaultManager];    //如果文件路径存在的话    BOOL bRet = [fileManager fileExistsAtPath:imageFile];    if (bRet)    {        //        NSLog(@"文件已存在");        if ([fileManager removeItemAtPath:imageFile error:nil])        {            //            NSLog(@"删除文件成功");            if ([imageData writeToFile:imageFile atomically:YES])            {                //                NSLog(@"保存文件成功");                back(imageFile);            }        }        else        {                    }            }    else    {        if (![imageData writeToFile:imageFile atomically:NO])        {            [fileManager createDirectoryAtPath:documentsDirectory withIntermediateDirectories:YES attributes:nil error:nil];            if ([imageData writeToFile:imageFile atomically:YES])            {                back(imageFile);            }        }        else        {            return YES;        }            }    return NO;}#pragma mark  从文档目录下获取Documents路径+ (NSString *)getImageDocumentFolderPath{    NSString *patchDocument = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];    return [NSString stringWithFormat:@"%@/Images", patchDocument];}@end

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