看到外国大牛的一段代码

- (void)clearAllUIWebViewData {

// Clear the webview cache...

[[NSURLCachesharedURLCache] removeAllCachedResponses];

[selfremoveApplicationLibraryDirectoryWithDirectory:@"Caches"];

[selfremoveApplicationLibraryDirectoryWithDirectory:@"WebKit"];

// Empty the cookie jar...

for (NSHTTPCookie *cookie in [[NSHTTPCookieStoragesharedHTTPCookieStorage] cookies]) {

[[NSHTTPCookieStoragesharedHTTPCookieStorage] deleteCookie:cookie];

}

[selfremoveApplicationLibraryDirectoryWithDirectory:@"Cookies"];

}


- (void)removeApplicationLibraryDirectoryWithDirectory:(NSString *)dirName {

NSString *dir = [[[[NSSearchPathForDirectoriesInDomains(NSApplicationDirectory, NSUserDomainMask, YES) lastObject] stringByDeletingLastPathComponent] stringByAppendingPathComponent:@"Library"] stringByAppendingPathComponent:dirName];

if ([[NSFileManagerdefaultManager] fileExistsAtPath:dir]) {

[[NSFileManagerdefaultManager] removeItemAtPath:dir error:nil];

}

}