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
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2022-08-12 20:17:16
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WKWebVie...
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 ()
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：
JS与iOS交互
JS页面获取iOS系统图片
IOSImage()" style="width: 50%;height: 5%;" type="button" value="打开相机获取图片" />
#import "ViewController.h" #import #import #import "SaveImage_Util.h" @interface ViewController () @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 *)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 *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(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 *)webView didReceiveServerRedirectForProvisionalNavigation:(null_unspecified WKNavigation *)navigation { } // 导航失败时会回调 - (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(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 *)message initiatedByFrame:(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 *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(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 *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(nullable NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(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 *)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 #import @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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