解决WKWebView加载的白屏问题

方法一:

objective - C 版

尝试在每次请求kWebview前清理缓存

/**
 清理缓存
 */
- (void)clearWbCache {
    [[NSURLCache sharedURLCache] removeAllCachedResponses];
    [[NSURLCache sharedURLCache] setDiskCapacity:0];
    [[NSURLCache sharedURLCache] setMemoryCapacity:0];
}

Swift 版

/// 清理缓存
    func clearCache() -> Void {
        URLCache.shared.removeAllCachedResponses();
        URLCache.shared.diskCapacity = 0;
        URLCache.shared.memoryCapacity = 0;
    }

方法二:

-- 服从代理协议并实现代理方法
objective - C 版本

- (void)webView:(WKWebView *)webView didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential * _Nullable credential))completionHandler {
     // 判断服务器采用的验证方法
    if (challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodServerTrust) {
         // 如果没有错误的情况下 创建一个凭证，并使用证书
        if (challenge.previousFailureCount == 0) {
            NSURLCredential *credential = [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust];
            completionHandler(NSURLSessionAuthChallengeUseCredential, credential);
        }else {
        // 验证失败，取消本次验证
            completionHandler(NSURLSessionAuthChallengeCancelAuthenticationChallenge, nil);
        }
    }else {
        completionHandler(NSURLSessionAuthChallengeCancelAuthenticationChallenge, nil);

    }
}

Swfit 版本

func webView(webView: WKWebView, didReceiveAuthenticationChallenge challenge: NSURLAuthenticationChallenge, completionHandler: (NSURLSessionAuthChallengeDisposition, NSURLCredential?) -> Void) {
        // 判断服务器采用的验证方法
    if challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodServerTrust {
        if challenge.previousFailureCount == 0 {
            // 如果没有错误的情况下 创建一个凭证，并使用证书
            let credential = NSURLCredential(forTrust: challenge.protectionSpace.serverTrust!)
            completionHandler(.UseCredential, credential)
        } else {
            // 验证失败，取消本次验证
            completionHandler(.CancelAuthenticationChallenge, nil)
        }
    } else {
        completionHandler(.CancelAuthenticationChallenge, nil)
    }