ios - 如何删除UIWebview中的缓存？

Question

我已经将URL加载到webview中，加载成功，但是每当我再次在缓存中命中它的show 2 url，再一次它的show 3 url等时，这意味着它将继续维护堆栈。我正在使用很多方法，但无法正常工作。

这些是我到目前为止所尝试的。

1.

[[NSURLCache sharedURLCache] removeCachedResponseForRequest:NSURLRequest];


[[NSURLCache sharedURLCache] removeAllCachedResponses];

for(NSHTTPCookie *cookie in [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies]) {

if([[cookie domain] isEqualToString:someNSStringUrlDomain]) {

    [[NSHTTPCookieStorage sharedHTTPCookieStorage] deleteCookie:cookie];
}
}

2.

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];

3.

 NSURLCache *sharedCache = [[NSURLCache alloc] initWithMemoryCapacity:0 diskCapacity:0 diskPath:nil];
[NSURLCache setSharedURLCache:sharedCache];
[sharedCache release];

4.

-(void) viewDidDisappear:(BOOL)animated {
[super viewDidDisappear:animated];

[self.webView removeFromSuperview];
self.webView.delegate = nil;
self.webView = nil;
}

5.

[[NSURLCache sharedURLCache] setDiskCapacity:0];
[[NSURLCache sharedURLCache] setMemoryCapacity:0];

6.

- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
[self.webView stopLoading];
}
- (void) stopLoading {
[self.webView stopLoading];
self.webView.delegate = nil;
NSBundle *mainBundle = [NSBundle mainBundle];
NSURL *homeIndexUrl = [mainBundle URLForResource:@"Home" withExtension:@"html"];
NSURLRequest *urlReq = [NSURLRequest requestWithURL:homeIndexUrl];
[self.webView loadRequest:urlReq];
[EALoaderView hideLoaderForView:self.view animated:YES];
[self.webView loadHTMLString:html baseURL:nil];
 }

我也尝试了以下答案。

1. Clearing UIWebview cache

2. NSURLProtocol isn't asked to load after YES response to canInitWithRequest

3. How To Clear A UIWebView

4. How to delete the cache from UIWebview or dealloc UIWebview

5. How to clear UIWebView cache?

6. UIwebview without Cache

我正在做很多研发工作，但没有找到解决这些问题的确切解决方案。

谢谢。

Answer 1

我使用下面的代码删除缓存，希望它对您有用:

//This must be called in Main Thread
+ (void)clearWebCache
{
 //http://stackoverflow.com/questions/31289838/how-to-delete-wkwebview-cookies
    //https://github.com/ShingoFukuyama/WKWebViewTips
    //http://stackoverflow.com/questions/27105094/how-to-remove-cache-in-wkwebview/32491271#32491271
    if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"9.0")) {
        NSSet *websiteDataTypes = [NSSet setWithArray:@[WKWebsiteDataTypeDiskCache,
                                                        //WKWebsiteDataTypeOfflineWebApplicationCache,
                                                        WKWebsiteDataTypeMemoryCache,
                                                        //WKWebsiteDataTypeLocalStorage,
                                                        //WKWebsiteDataTypeCookies,
                                                        //WKWebsiteDataTypeSessionStorage,
                                                        //WKWebsiteDataTypeIndexedDBDatabases,
                                                        //WKWebsiteDataTypeWebSQLDatabases
                                                        ]];
        //// All kinds of data
        //            NSSet *websiteDataTypes = [WKWebsiteDataStore allWebsiteDataTypes];
        //// Date from
        NSDate *dateFrom = [NSDate dateWithTimeIntervalSince1970:0];
        //// Execute
        [[WKWebsiteDataStore defaultDataStore] removeDataOfTypes:websiteDataTypes modifiedSince:dateFrom completionHandler:^{
            // Done
        }];
    }
    else {
        NSHTTPCookie *cookie;
        NSHTTPCookieStorage *storage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
        for (cookie in [storage cookies]) {
            [storage deleteCookie:cookie];
        }
        [[NSURLCache sharedURLCache] removeAllCachedResponses];
    }
}