NSURLConnection 实现webView显示HTTPS页面

我们在浏览器访问https页面的时候的，会弹出： 
信任证书

我们接下来信任证书以及显示出来

遵循协议

@interface ViewController ()<NSURLConnectionDataDelegate>
1
1
interface：

@interface ViewController ()<NSURLConnectionDataDelegate>
/**

• 存储data数据

  */

  @property(nonatomic,strong)NSMutableData *dataM;
  /**

• 访问url链接

  */

  @property(nonatomic,strong)NSURL *url;
  @property(nonatomic,weak)IBOutlet UIWebView *webView;
  @end

  实现代理方法：

  #pragma mark - NSURLSessionDataDelegate代理方法
  -(void)URLSession:(NSURLSession )session task:(NSURLSessionTask )task
  didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge

  completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential * __nullable credential))completionHandler

  {

     NSLog(@"challenge = %@",challenge.protectionSpace.serverTrust);
     //判断是否是信任服务器证书
     if (challenge.protectionSpace.authenticationMethod ==NSURLAuthenticationMethodServerTrust)
     {
         //创建一个凭据对象
         NSURLCredential *credential = [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust];
         //告诉服务器客户端信任证书
         [challenge.sender useCredential:credential forAuthenticationChallenge:challenge];
  
     }

  }
  /**

• 接收到服务器返回的数据时调用

  */

  -(void)connection:(NSURLConnection )connection didReceiveData:(NSData )data
  {

     NSLog(@"接收到的数据%zd",data.length);
     [self.dataM appendData:data];

  }
  /**

• 请求完毕

  */

  -(void)connectionDidFinishLoading:(NSURLConnection *)connection
  {

     NSString *html = [[NSString alloc]initWithData:self.dataM encoding:NSUTF8StringEncoding];
  
     NSLog(@"请求完毕");
     [self.webView loadHTMLString:html baseURL:self.url];

  }
  懒加载：
  -(NSMutableData *)dataM
  {

     if (_dataM == nil)
     {
         _dataM = [[NSMutableData alloc]init];
     }
     return _dataM;

  }