解决办法：

    NSString *encodedString = [_urlstringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

    NSURL *url =[NSURLURLWithString:[NSStringstringWithFormat:@"%@",encodedString]];

    NSURLRequest *request =[NSURLRequestrequestWithURL:url];

    [_webViewloadRequest:request];