如何删除 UIWebview 中的缓存？答案

【问题标题】：How to delete the cache in UIWebview?如何删除 UIWebview 中的缓存？
【发布时间】：2017-02-03 11:02:10
【问题描述】：

我已经在webview 中加载了 url，加载是成功的，但是每当我再次点击它在缓存中显示两个 url 和再次显示三个 url 等时，这意味着它继续维护堆栈。我使用了很多方法，但无法正常工作。

这些都是我到现在为止的尝试。

[[NSURLCache sharedURLCache] removeCachedResponseForRequest:NSURLRequest];


[[NSURLCache sharedURLCache] removeAllCachedResponses];

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

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

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

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];

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

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

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

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

- (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];
 }

我也尝试过以下这些答案。

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

我做了很多研发，但没有找到解决这些问题的确切解决方案。

谢谢。

【问题讨论】：

标签： ios objective-c caching uiwebview

【解决方案1】：

我使用下面的代码删除缓存，希望它对你有用：

//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];
    }
}

【讨论】：

【解决方案2】：

嘿，伙计们！研究了这个主题一段时间，并找到了最适合我的解决方案 - 使用 WKWebView 它不会泄漏！就是这样 - 如此简单。

【讨论】：