我们如何在Swift中点击第一个VC打开标签栏

Question

我有一个VC，点击按钮想要打开第一个索引上的标签栏VC。我通过现在的风格打开了这个。我家的vc在标签栏的第一个索引上。我怎么能打开它？我的UI看起来像那样，

我试过的代码就是这个，

 let storyboard = UIStoryboard(name: "Main", bundle: nil)
                let tabbarVC = storyboard.instantiateViewController(withIdentifier: "MainVC") as! MainVC
                if let vcs = tabbarVC.viewControllers,
                    let nc = vcs.first as? UINavigationController,

                self.present(tabbarVC, animated: false, completion: nil)

Answer 1

你可以给一个id并直接打开

 let storyboard = UIStoryboard(name: "Main", bundle: nil)
 let tabbarVC = storyboard.instantiateViewController(withIdentifier: "MainVC") as! MainVC
 self.present(tabbarVC, animated: false, completion: nil)

//

const char* tmp = raw_data_buffer->str().c_str();
                                // ^^^^^ returns a temporary that is destroyed
                                //       at the end of this statement
//          ^^^ now a dangling pointer