最近做一個項目，開始是使用WebView與JS交互的，由於內存管理方面WebView欠佳。WKWebVIew的內存線程管理好，所以選擇使用 WKWebVIew(使用WKWebView 的缺點在於，這個控件加載的H5頁面不支持ajax請求，所以需要自己把網絡請求在OC上實現)。

一、首先說下應該注意的問題：

1.要獲取拍照或相冊的圖片，如果是iOS 10系統，需要設置訪問權限（在 Info-plist 中設置）

相機權限： Privacy - Camera Usage Description 是否允許此App使用你的相機？
相冊權限： Privacy - Photo Library Usage Description 是否允許此App訪問你的媒體資料庫？

2.WebView和WKWebView和JS互調的方法和使用的傳參類型不同

WebView 使用 （window.iosModel.getImage(JSON.stringify(parameter));//JSON.stringify(參數字符串) 這個方法是 把字符串轉換成json字符串 parameter是參數字符串
）傳值給 OC

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

3.需要特別注意的是：WKWebView 不執行JS寫的 ajax請求（WKWebView 可能由於基於 WebKit，並不會執行 C socket 相關的函數對 HTTP 請求進行處理）如果有網絡請求，需要自己用OC實現

4.使用的時候不要忘記掛上使用到的代理，和導入代理

 

@interface ViewController () 

5.屏蔽WebView的可選菜單（即不會出現拷貝、全選等彈出菜單）在加載完成後的代理中執行以下兩段JS

 

// 導航完成時，會回調（也就是頁面載入完成了）
- (void)webView:(WKWebView *)webView didFinishNavigation:(null_unspecified WKNavigation *)navigation {
    NSLog(@"66===%s", __FUNCTION__);
    // 禁用選中效果
    [self.webView evaluateJavaScript:@"document.documentElement.style.webkitUserSelect='none'" completionHandler:nil];
    [self.webView evaluateJavaScript:@"document.documentElement.style.webkitTouchCallout='none'" completionHandler:nil];
}

 

二、代碼：

JS與iOS交互

JS頁面獲取iOS系統圖片

<script> var getIOSImage = function(){ var parameter = {'title':'JS調OC','describe':'這裡就是JS傳給OC的參數'}; // 在下面這裡實現js 調用系統原生api iosDelegate //JSON.stringify(參數字符串) 這個方法是 把字符串轉換成json字符串 window.iosDelegate.getImage(JSON.stringify(parameter));// 實現數據的 json 格式字符串 } // 這裡是 iOS調用js的方法 function setImageWithPath(arguments){ document.getElementById('changeImage').src = arguments['imagePath']; document.getElementById('iosParame').innerHTML = arguments['iosContent']; } </script>

#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;// 交替圖片名字 UIImage *getImage;//獲取的圖片 } - (void)viewDidLoad { [super viewDidLoad]; self.edgesForExtendedLayout = UIRectEdgeNone; self.automaticallyAdjustsScrollViewInsets = NO; WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init]; // 設置偏好設置 config.preferences = [[WKPreferences alloc] init]; // 默認為0 config.preferences.minimumFontSize = 10; // 默認認為YES config.preferences.javaScriptEnabled = YES; // 在iOS上默認為NO，表示不能自動通過窗口打開 config.preferences.javaScriptCanOpenWindowsAutomatically = NO; // web內容處理池 config.processPool = [[WKProcessPool alloc] init]; // 通過JS與webview內容交互 config.userContentController = [[WKUserContentController alloc] init]; // 注入JS對象名稱AppModel，當JS通過AppModel來調用時， // 我們可以在WKScriptMessageHandler代理中接收到 [config.userContentController addScriptMessageHandler:self name:@"iosModel"]; //通過默認的構造器來創建對象 self.webView = [[WKWebView alloc] initWithFrame:self.view.bounds configuration:config]; // 導航代理 self.webView.navigationDelegate = self; // 與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監聽 [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]; // 添加進入條 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:@"後退" style:UIBarButtonItemStyleDone target:self action:@selector(goback)]; self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"前進" 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 // 通過這個方法獲取 JS傳來的json字符串 - (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message { if ([message.name isEqualToString:@"iosModel"]) { // 打印所傳過來的參數，只支持NSNumber, NSString, NSDate, NSArray, // NSDictionary, and NSNull類型 NSLog(@"JS傳來的json字符串 ： %@", message.body); NSDictionary *jsDictionary = message.body; if ([jsDictionary[@"means"] isEqualToString:@"獲取系統圖片"]) { [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 // 請求開始前，會先調用此代理方法 // 與UIWebView的 // - (BOOL)webView:(UIWebView *)webView // shouldStartLoadWithRequest:(NSURLRequest *)request // navigationType:(UIWebViewNavigationType)navigationType; // 類型，在請求先判斷能不能跳轉（請求） - (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"]) { // 對於跨域，需要手動跳轉， 用系統浏覽器（Safari）打開 [[UIApplication sharedApplication] openURL:navigationAction.request.URL]; // 不允許web內跳轉 decisionHandler(WKNavigationActionPolicyCancel); } else { self.progressView.alpha = 1.0; decisionHandler(WKNavigationActionPolicyAllow); } } // 在響應完成時，會回調此方法 // 如果設置為不允許響應，web內容就不會傳過來 - (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler { decisionHandler(WKNavigationResponsePolicyAllow); } // 開始導航跳轉時會回調 - (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(null_unspecified WKNavigation *)navigation { } // 接收到重定向時會回調 - (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(null_unspecified WKNavigation *)navigation { } // 導航失敗時會回調 - (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error { } // 頁面內容到達main frame時回調 - (void)webView:(WKWebView *)webView didCommitNavigation:(null_unspecified WKNavigation *)navigation { } // 導航完成時，會回調（也就是頁面載入完成了） - (void)webView:(WKWebView *)webView didFinishNavigation:(null_unspecified WKNavigation *)navigation { NSLog(@"66===%s", __FUNCTION__); // 禁用選中效果 [self.webView evaluateJavaScript:@"document.documentElement.style.webkitUserSelect='none'" completionHandler:nil]; [self.webView evaluateJavaScript:@"document.documentElement.style.webkitTouchCallout='none'" completionHandler:nil]; } // 導航失敗時會回調 - (void)webView:(WKWebView *)webView didFailNavigation: (null_unspecified WKNavigation *)navigation withError:(NSError *)error { } /* 對於HTTPS的都會觸發此代理，如果不要求驗證，傳默認就行 如果需要證書驗證，與使用AFN進行HTTPS證書驗證是一樣的 */ - (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內容處理中斷時會觸發 /* - (void)webViewWebContentProcessDidTerminate:(WKWebView *)webView { } */ #pragma mark - WKUIDelegate - (void)webViewDidClose:(WKWebView *)webView { } /* 在JS端調用alert函數時，會觸發此代理方法。JS端調用alert時所傳的數據可以通過message拿到 在原生得到結果後，需要回調JS，是通過completionHandler回調 */ - (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:@"確定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) { completionHandler(); }]]; [self presentViewController:alert animated:YES completion:NULL]; NSLog(@"%@", message); } // JS端調用confirm函數時，會觸發此方法 // 通過message可以拿到JS端所傳的數據 // 在iOS端顯示原生alert得到YES/NO後 // 通過completionHandler回調給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:@"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); } // JS端調用prompt函數時，會觸發此方法 // 要求輸入一段文本 // 在原生輸入得到文本內容後，通過completionHandler回調給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:@"確定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) { completionHandler([[alert.textFields lastObject] text]); }]]; [self presentViewController:alert animated:YES completion:NULL]; } // 獲取圖片 - (void)beginOpenPhoto { // 主隊列 異步打開相機 dispatch_async(dispatch_get_main_queue(), ^{ [self takePhoto]; }); } #pragma mark 取消選擇照片代理方法 - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker { [picker dismissViewControllerAnimated:YES completion:nil]; } #pragma mark //打開本地照片 - (void) localPhoto { UIImagePickerController *imagePicker = [[UIImagePickerController alloc]init]; imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; imagePicker.delegate = self; [self presentViewController:imagePicker animated:YES completion:nil]; } #pragma mark //打開相機拍照 - (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(@"模擬器中不能打開相機"); [self localPhoto]; } } // 選擇一張照片後進入這裡 - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { NSString *type = [info objectForKey:UIImagePickerControllerMediaType]; // 當前選擇的類型是照片 if ([type isEqualToString:@"public.image"]) { // 獲取照片 getImage = [info objectForKey:@"UIImagePickerControllerOriginalImage"]; NSLog(@"===Decoded image size: %@", NSStringFromCGSize(getImage.size)); // obtainImage 壓縮圖片 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(@"圖片路徑：%@",imagePath); /** * 這裡是IOS 調 js 其中 setImageWithPath 就是js中的方法 setImageWithPath(),參數是字典 */ NSString *callJSString = [NSString stringWithFormat:@"%@({\"imagePath\":\"%@\",\"iosContent\":\"獲取圖片成功，把系統獲取的圖片路徑傳給js 讓html顯示\"})",@"setImageWithPath",imagePath]; [self.webView evaluateJavaScript:callJSString completionHandler:^(id resultObject, NSError * _Nullable error) { if (!error) { NSLog(@"OC調 JS成功"); } else { NSLog(@"OC調 JS 失敗"); } }]; }); }]; [picker dismissViewControllerAnimated:YES completion:nil]; } } @end

 

下面是圖片處理的 工具類

 

 

//  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  保存圖片到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  保存圖片到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];
    //如果文件路徑存在的話
    BOOL bRet = [fileManager fileExistsAtPath:imageFile];
    if (bRet)
    {
        //        NSLog(@"文件已存在");
        if ([fileManager removeItemAtPath:imageFile error:nil])
        {
            //            NSLog(@"刪除文件成功");
            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  從文檔目錄下獲取Documents路徑
+ (NSString *)getImageDocumentFolderPath
{
    NSString *patchDocument = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
    return [NSString stringWithFormat:@"%@/Images", patchDocument];
}
@end

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