我創建了一個導航控制器。我在導航控制器的右上角添加了一個加號按鈕，它會打開一個新的視圖控制器。但是，我希望導航欄也顯示在新螢屏上。但它沒有顯示。我做錯了什么，或者我錯過了什么？這是我的代碼：
ViewController.swift
import UIKit
class ViewController: UIViewController {
@IBOutlet weak var toDoListTextView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
//Setting the Title for the nav bar
title = "To Do List"
configureNavigationItems()
}
private func configureNavigationItems(){
/* Adding a button on the top right of the screen
* in the navigation bar/controller.
*/
navigationItem.rightBarButtonItem = UIBarButtonItem(
barButtonSystemItem: .add,
target: self,
action: #selector(didTapPlus)
)
}
@objc func didTapPlus(){
let vc = storyboard?.instantiateViewController(identifier: "makeTask") as! makeTaskViewController
vc.modalPresentationStyle = .fullScreen
vc.title = "Create a Task"
vc.view.backgroundColor = .black
vc.navigationItem.leftBarButtonItem = UIBarButtonItem(
title: "Back",
style: .done,
target: self,
action: nil)
present(vc, animated: true)
}
}
Storyboard
uj5u.com熱心網友回復：
嘗試這個！
import UIKit
class ViewController: UIViewController {
@IBOutlet weak var toDoListTextView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
//Setting the Title for the nav bar
title = "To Do List"
configureNavigationItems()
}
private func configureNavigationItems(){
navigationItem.rightBarButtonItem = UIBarButtonItem(
barButtonSystemItem: .add,
target: self,
action: #selector(didTapPlus)
)
}
@objc func didTapPlus(){
let vc = storyboard?.instantiateViewController(identifier: "makeTask") as! makeTaskViewController
vc.modalPresentationStyle = .fullScreen
vc.title = "Create a Task"
vc.view.backgroundColor = .black
vc.navigationItem.leftBarButtonItem = UIBarButtonItem(
title: "Back",
style: .done,
target: self,
action: nil)
navigationController?.pushViewController(vc, animated: true)
//present(vc, animated: true)
}
}
??
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