如何向alertController发送消息？

Question

我正在学习Objective-C，我想创建一个tableView。当我触摸一个表时，会显示一个警报视图。警报视图将显示一个名称，一个描述和两个可以输入新名称的textFields如何通过点击＆＃34; Ok＆＃34;更改名称和说明。 button.here是我的代码：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{

    Coder *coder = _allCoder[indexPath.row];

    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Jack" message:@"Jack is a coder" preferredStyle:UIAlertControllerStyleAlert];

    [alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
        textField.placeholder =@"name"; }];
    [alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
        textField.placeholder = @"description";}];
    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel handler:nil];


    UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"Ok" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action){
        UITextField *name = alertController.textFields.firstObject;
        coder.name = name.text;
        UITextField *desc = alertController.textFields.lastObject;
        coder.desc = desc.text;
    }];
    [alertController addAction:cancelAction];
    [alertController addAction:okAction];

    [self presentViewController:alertController animated:YES completion:nil];
}