ios - 在 swift 4 中显示和关闭 View Controller

Question

我正在尝试呈现一个 View Controller 并关闭我当前的模态视图。我在 StackOverflow 上看到了答案，但我不明白。

self.dismissViewControllerAnimated(true, completion: {
    let vc = self.storyboard?.instantiateViewControllerWithIdentifier("myViewController")
        self.presentViewController(vc!, animated: true, completion: nil)
})

谁能告诉我，如何简单地做到这一点？谢谢

Answer 1

检查堆栈中的主 Controller 并弹出所有其他 View Controller ，然后呈现新的 View Controller 。

if let controllers =  self.navigationController?.viewControllers  {
    for vc in controllers {
        // Check if the view controller is of MainViewController type
        if let myVC = vc as? MainViewController {
            self.navigationController?.popToViewController(myVC, animated: false)
        }
    }
}

推送 View Controller :

let secondVC = self.storyboard?.instantiateViewController(withIdentifier: "secondVC") as! SecondViewController
self.navigationController?.pushViewController(secondVC, animated: true)

或当前 View Controller :

let next = self.storyboard?.instantiateViewController(withIdentifier: "secondVC") as! SecondViewController
self.present(next as UIViewController, animated: true, completion: nil)