技術標籤：iOS 開發

如何不用快取，每次請求最新的Web資料

- (void)loadNoCacheData {
    NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"http://www.baidu.com"]];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:15.0];
    [_webView loadRequest:request];
}
 

每次請求設定快取策略為不使用快取：NSURLRequestReloadIgnoringLocalCacheData

typedef NS_ENUM(NSUInteger, NSURLRequestCachePolicy)
{
    NSURLRequestUseProtocolCachePolicy = 0,

    NSURLRequestReloadIgnoringLocalCacheData = 1,
    NSURLRequestReloadIgnoringLocalAndRemoteCacheData = 4,
    NSURLRequestReloadIgnoringCacheData = NSURLRequestReloadIgnoringLocalCacheData,

    NSURLRequestReturnCacheDataElseLoad = 2,
    NSURLRequestReturnCacheDataDontLoad = 3,

    NSURLRequestReloadRevalidatingCacheData = 5,
};
 

如果請求的時候使用了預設的快取策略，可以通過以下方式清除快取：

- (void)deleteWebCache {
    //allWebsiteDataTypes清除所有快取
    NSSet *websiteDataTypes = [WKWebsiteDataStore allWebsiteDataTypes];
    NSDate *dateFrom = [NSDate dateWithTimeIntervalSince1970:0];
    [[WKWebsiteDataStore defaultDataStore] removeDataOfTypes:websiteDataTypes modifiedSince:dateFrom completionHandler:^{
        
    }];
}
 

也可以自定義清除快取

- (void)deleteWebCache {
    NSArray *types = @[WKWebsiteDataTypeCookies, WKWebsiteDataTypeLocalStorage];
    NSSet *websiteDataTypes= [NSSet setWithArray:types];
    NSDate *dateFrom = [NSDate dateWithTimeIntervalSince1970:0];
    [[WKWebsiteDataStore defaultDataStore] removeDataOfTypes:websiteDataTypes modifiedSince:dateFrom completionHandler:^{

    }];
}

/*! @constant WKWebsiteDataTypeDiskCache On-disk caches. */
WK_EXTERN NSString * const WKWebsiteDataTypeDiskCache API_AVAILABLE(macos(10.11), ios(9.0));

/*! @constant WKWebsiteDataTypeMemoryCache In-memory caches. */
WK_EXTERN NSString * const WKWebsiteDataTypeMemoryCache API_AVAILABLE(macos(10.11), ios(9.0));

/*! @constant WKWebsiteDataTypeOfflineWebApplicationCache HTML offline web application caches. */
WK_EXTERN NSString * const WKWebsiteDataTypeOfflineWebApplicationCache API_AVAILABLE(macos(10.11), ios(9.0));

/*! @constant WKWebsiteDataTypeCookies Cookies. */
WK_EXTERN NSString * const WKWebsiteDataTypeCookies API_AVAILABLE(macos(10.11), ios(9.0));

/*! @constant WKWebsiteDataTypeSessionStorage HTML session storage. */
WK_EXTERN NSString * const WKWebsiteDataTypeSessionStorage API_AVAILABLE(macos(10.11), ios(9.0));

/*! @constant WKWebsiteDataTypeLocalStorage HTML local storage. */
WK_EXTERN NSString * const WKWebsiteDataTypeLocalStorage API_AVAILABLE(macos(10.11), ios(9.0));

/*! @constant WKWebsiteDataTypeWebSQLDatabases WebSQL databases. */
WK_EXTERN NSString * const WKWebsiteDataTypeWebSQLDatabases API_AVAILABLE(macos(10.11), ios(9.0));

/*! @constant WKWebsiteDataTypeIndexedDBDatabases IndexedDB databases. */
WK_EXTERN NSString * const WKWebsiteDataTypeIndexedDBDatabases API_AVAILABLE(macos(10.11), ios(9.0));