详解iOS webview加载时序和缓存问题总结

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {  NSLog(@"开始请求webview:%@",request.URL.relativeString);  return YES;} - (void)webViewDidStartLoad:(UIWebView *)webView {    NSLog(@"开始加载webview");  }- (void)webViewDidFinishLoad:(UIWebView *)webView {    NSLog(@"结束加载webview");  }  - (void)webView:(UIWebView *)webView didFailLoadWithError:(nonnull NSError *)error { 　　 NSLog(@"webView加载失败"); }

- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {  NSLog(@"webview开始请求");  decisionHandler(WKNavigationActionPolicyAllow);}- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation {  NSLog(@"webView开始加载");}- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler {  NSLog(@"webview开始收到响应");  decisionHandler(WKNavigationResponsePolicyAllow);}-----------------显示开始加载html CSS js 和图片资源等（JS引擎单线程顺序执行）---------------- (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation {  NSLog(@"1");}- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation {  NSLog(@"webview结束加载内容");}- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation withError:(NSError *)error{  NSLog(@"webview加载失败");}- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(WKNavigation *)navigation{  NSLog(@"开始重定向的函数");}- (void)webView:(WKWebView *)webView didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition, NSURLCredential *))completionHandler{  NSLog(@"2");  completionHandler(NSURLSessionAuthChallengePerformDefaultHandling, nil);}

document.write( " <script src='test.js?rnd= " + Math.random() + " '></s " + " cript> " )

var js = document.createElement( " script " )js.src = " test.js " + Math.random()document.body.appendChild(js)

<script src="test.js?ver=113"></script>

- (void)removeWebCache{  if ([[UIDevice currentDevice].systemVersion floatValue] >= 9.0) {    NSSet *websiteDataTypes= [NSSet setWithArray:@[                            WKWebsiteDataTypeDiskCache,                            //WKWebsiteDataTypeOfflineWebApplication                            WKWebsiteDataTypeMemoryCache,                            //WKWebsiteDataTypeLocal                            WKWebsiteDataTypeCookies,                            //WKWebsiteDataTypeSessionStorage,                            //WKWebsiteDataTypeIndexedDBDatabases,                            //WKWebsiteDataTypeWebSQLDatabases                            ]];        // All kinds of data    //NSSet *websiteDataTypes = [WKWebsiteDataStore allWebsiteDataTypes];    NSDate *dateFrom = [NSDate dateWithTimeIntervalSince1970:0];    [[WKWebsiteDataStore defaultDataStore] removeDataOfTypes:websiteDataTypes modifiedSince:dateFrom completionHandler:^{          }];    [[NSURLCache sharedURLCache] removeAllCachedResponses];      } else {    //先删除cookie    NSHTTPCookie *cookie;    NSHTTPCookieStorage *storage = [NSHTTPCookieStorage sharedHTTPCookieStorage];    for (cookie in [storage cookies])    {      [storage deleteCookie:cookie];    }        NSString *libraryDir = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) objectAtIndex:0];    NSString *bundleId = [[[NSBundle mainBundle] infoDictionary]                objectForKey:@"CFBundleIdentifier"];    NSString *webkitFolderInLib = [NSString stringWithFormat:@"%@/WebKit",libraryDir];    NSString *webKitFolderInCaches = [NSString                     stringWithFormat:@"%@/Caches/%@/WebKit",libraryDir,bundleId];    NSString *webKitFolderInCachesfs = [NSString                      stringWithFormat:@"%@/Caches/%@/fsCachedData",libraryDir,bundleId];    NSError *error;    /* iOS8.0 WebView Cache的存放路径 */    [[NSFileManager defaultManager] removeItemAtPath:webKitFolderInCaches error:&error];    [[NSFileManager defaultManager] removeItemAtPath:webkitFolderInLib error:nil];    /* iOS7.0 WebView Cache的存放路径 */    [[NSFileManager defaultManager] removeItemAtPath:webKitFolderInCachesfs error:&error];    NSString *cookiesFolderPath = [libraryDir stringByAppendingString:@"/Cookies"];    [[NSFileManager defaultManager] removeItemAtPath:cookiesFolderPath error:&error];    [[NSURLCache sharedURLCache] removeAllCachedResponses];  }}

  - (void)webViewDidFinishLoad:(UIWebView *)webView  {    //防止内存泄漏    [[NSUserDefaults standardUserDefaults] setInteger:0 forKey:@"WebKitCacheModelPreferenceKey"];    //本地webkit硬盘图片的缓存；    [[NSUserDefaults standardUserDefaults] setBool:NO forKey:@"WebKitDiskImageCacheEnabled"];//自己添加的，原文没有提到。    //静止webkit离线缓存    [[NSUserDefaults standardUserDefaults] setBool:NO forKey:@"WebKitOfflineWebApplicationCacheEnabled"];//自己添加的，，原文没有提到。    [[NSUserDefaults standardUserDefaults] synchronize];  }  - (void)dealloc  {    [webView loadHTMLString:@"" baseURL:nil];    [webView stopLoading];    [webView removeFromSuperview];    webView = nil;    [[NSURLCache sharedURLCache] removeAllCachedResponses];     [[NSURLCache sharedURLCache] setDiskCapacity:0];     [[NSURLCache sharedURLCache] setMemoryCapacity:0];     NSLog(@"释放了webview");  }  - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{      int cacheSizeMemory = 4*1024*1024; // 4MB int           cacheSizeDisk = 32*1024*1024; // 32MB      NSURLCache *sharedCache = [[NSURLCache alloc] initWithMemoryCapacity:cacheSizeMemory diskCapacity:cacheSizeDisk diskPath:@"nsurlcache"];     [NSURLCache setSharedURLCache:sharedCache];   ｝   - (void)applicationDidReceiveMemoryWarning:(UIApplication *)application {      [[NSURLCache sharedURLCache] removeAllCachedResponses];  }

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