ios UIWebView加载https出现 load page error:Error Domain=NSURLErrorDomain Code=-1202 "此服务器的证书无效

今天用UIWebView加载https时出现此服务器的证书无效，然后在网上找解决方法，发现并不是很完美，根据自己的理解修改如下：

1.在webview出现的XX.h文件中加入NSURLConnectionDelegate代理，并声明以下变量

  NSURLConnection *_urlConnection;

  NSURLRequest *_request;

  BOOL _authenticated;

2.在xx.m文件中加入以下方法

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType;
{
    if (!_authenticated) {
        _authenticated =NO;
        _urlConnection = [[NSURLConnection alloc] initWithRequest:request delegate:self]; // 网上好多教程这句写的request写的是_request
        _request = request; //网上好多教程这句代码忘记加了
        [_urlConnection start];
        return NO;
    }
    return YES;
}

#pragma mark - NURLConnection delegate

- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge
{
    if ([challenge previousFailureCount] == 0)
    {
        _authenticated = YES;
        NSURLCredential *credential = [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust];
        [challenge.sender useCredential:credential forAuthenticationChallenge:challenge];
    } else
    {
        [[challenge sender] cancelAuthenticationChallenge:challenge];
    }
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    // remake a webview call now that authentication has passed ok.
    _authenticated = YES;
    [self.webView loadRequest:_request]; //  self.webView替换成自己的webview
    // Cancel the URL connection otherwise we double up (webview + url connection, same url = no good!)
    [_urlConnection cancel];
}

// We use this method is to accept an untrusted site which unfortunately we need to do, as our PVM servers are self signed.
- (BOOL)connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace
{
    return [protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust];
}

希望对大家有用，有意见可以在文章下面提