ios - 无法呈现/推送另一个 View Controller

Question

Warning: Attempt to present iChat.ChatMessagesController: 0x7fee42679fd0> on iChat.NewMessageController: 0x7fee42529e60> whose view is not in the window hierarchy!

我有以编程方式创建的 TableView 和 Storyboard中的其他 View ，我试图从 TableView 中选择的一行中呈现。

类:聊天消息 Controller

Storyboard ID ChatMessagesController

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    dismiss(animated: true) {
        let storyBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
        let newViewController = storyBoard.instantiateViewController(withIdentifier: "ChatMessagesController") as! ChatMessagesController
        self.present(newViewController, animated: true, completion: nil)
    }
}

Answer 1

你需要

 override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

    let storyBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
    let newViewController = storyBoard.instantiateViewController(withIdentifier: "ChatMessagesController") as! ChatMessagesController
    self.present(newViewController, animated: true, completion: nil)

}

因为这个 dismiss(animated: true) { 将关闭当前的 vc ，并且如果您需要完全删除当前的 vc 并替换为，您将无法在其中显示任何内容新的，然后做

(UIApplication.shared.delegate as! AppDelegate).window!.rootViewController  = newViewController

EdiT:您可以使用推送和删除当前 vc(当前应嵌入导航中)

self.navigationController?.pushViewController([newViewController], animated: true)

而不是 present