关于UIWebview缓存的问题

最近在做公司内部的一款app,涉及到UIWebview的缓存问题,

不是主动做的webview crach缓存,而是UIWebview的自动缓存,这个问题导致,网页更新的时候,即使在网址后面加了时间戳,也不能及时更新网页,

后来才知道要在离开网页的时候清理webview的缓存 并将webview置nil

-(void)viewWillDisappear:(BOOL)animated {

    

    [super viewWillDisappear:animated];

    _webView = nil;

    [self cleanCacheAndCookie];

}

- (void)cleanCacheAndCookie{

    //清除cookies

    NSHTTPCookie *cookie;

    NSHTTPCookieStorage *storage = [NSHTTPCookieStorage sharedHTTPCookieStorage];

    for (cookie in [storage cookies]){

        [storage deleteCookie:cookie];

    }

    //清除UIWebView的缓存

    [[NSURLCache sharedURLCache] removeAllCachedResponses];

    NSURLCache * cache = [NSURLCache sharedURLCache];

    [cache removeAllCachedResponses];

    [cache setDiskCapacity:0];

    [cache setMemoryCapacity:0];

}