如何清除 objective C 中的应用程序缓存？

Question

我正在构建一个 iOS 应用程序，我在其中实现了 Fabric 并使用 Digits login.When 登录成功会话保持打开状态。

我遇到了一个问题，我想清除应用程序缓存以重置会话，以便用户可以使用新的 phone number.But 再次登录，但这并没有发生。

我用来清除应用缓存的代码：

- (void)viewDidLoad {

    [super viewDidLoad];

    [[NSURLCache sharedURLCache] removeAllCachedResponses];

}

感谢帮助！

Answer 1

由于您的问题的某些关键部分缺失（例如您使用的身份验证方法），我将在此处 post 一个可能会解决您的问题的方便的片段。

但请注意：这将删除所有 cookie 和所有缓存的响应以及所有 NSURLCredentials（只要它们未持久化）。

- (void)removeAllStoredCredentials
{
    // Delete any cached URLrequests!
    NSURLCache *sharedCache = [NSURLCache sharedURLCache];
    [sharedCache removeAllCachedResponses];

    // Also delete all stored cookies!
    NSHTTPCookieStorage *cookieStorage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
    NSArray *cookies = [cookieStorage cookies];
    id cookie;
    for (cookie in cookies) {
        [cookieStorage deleteCookie:cookie];
    }

    NSDictionary *credentialsDict = [[NSURLCredentialStorage sharedCredentialStorage] allCredentials];
    if ([credentialsDict count] > 0) {
        // the credentialsDict has NSURLProtectionSpace objs as keys and dicts of userName => NSURLCredential
        NSEnumerator *protectionSpaceEnumerator = [credentialsDict keyEnumerator];
        id urlProtectionSpace;
        // iterate over all NSURLProtectionSpaces
        while (urlProtectionSpace = [protectionSpaceEnumerator nextObject]) {
            NSEnumerator *userNameEnumerator = [[credentialsDict objectForKey:urlProtectionSpace] keyEnumerator];
            id userName;
            // iterate over all usernames for this protectionspace, which are the keys for the actual NSURLCredentials
            while (userName = [userNameEnumerator nextObject]) {
                NSURLCredential *cred = [[credentialsDict objectForKey:urlProtectionSpace] objectForKey:userName];
                //NSLog(@"credentials to be removed: %@", cred);
                [[NSURLCredentialStorage sharedCredentialStorage] removeCredential:cred forProtectionSpace:urlProtectionSpace];
            }
        }
    } 
}

Answer 2

你可以使用你的库自己的高级机制，而不是使用低级和混乱的 NSURLCache：

[[Digits sharedInstance] logOut]

如何清除 objective C 中的应用程序缓存？

How to clear cache of app in objective C?

caching

objective-c

nsurlcache

ios