我有一个允许用户创建帐户的 View Controller 。创建帐户后，我将尝试以编程方式实例化一个名为 intermediate vc 的新 View Controller 。我搜索了堆栈溢出，但似乎找不到任何相关答案。我无法为 View Controller 设置标识符，因为它不是 Storyboard的一部分。
我在我的 createAccountController 中创建了一个按钮，它应该会导致过渡到下一个屏幕。
这里是我的createAccountController的相关代码
let testButton: UIButton = UIButton()
override func viewDidLoad() {
view.addSubview(testButton)
testButton.backgroundColor = UIColor.black
testButton.setTitle("Hi", for: .normal)
testButton.translatesAutoresizingMaskIntoConstraints = false
testButton.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
testButton.centerYAnchor.constraint(equalTo: usernameName.centerYAnchor, constant: 20).isActive = true
testButton.addTarget(self, action: #selector(moveToIntermediate), for: .touchUpInside)
}
intermediateViewController 是我在 createAccountController 中创建的 View Controller 类，下面的函数是我的 createAccountController 中的函数。
@objc func moveToIntermediate() {
let interMediate = intermediateViewController()
interMediate.modalTransitionStyle = .crossDissolve
interMediate.view.layer.speed = 0.2
self.present(interMediate, animated: true, completion: nil)
}
这里是中间的ViewController代码
class intermediateViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
let floatingButton: UIButton = UIButton()
let categoryTableView: UITableView = UITableView()
override func viewDidLoad() {
super.viewDidLoad()
setTableView()
setNavBar()
setFloatingButton()
//when view starts
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
//you can dispose of stuff here
}
func setTableView() {
categoryTableView.translatesAutoresizingMaskIntoConstraints = false
self.view.addSubview(categoryTableView)
categoryTableView.leadingAnchor.constraint(equalTo: self.view.leadingAnchor).isActive = true
categoryTableView.trailingAnchor.constraint(equalTo: self.view.trailingAnchor).isActive = true
categoryTableView.topAnchor.constraint(equalTo: self.view.bottomAnchor, constant: 0.0).isActive = true
categoryTableView.bottomAnchor.constraint(equalTo: self.view.bottomAnchor).isActive = true
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 10
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = categoryTableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
return cell
}
func setNavBar() {
self.navigationController?.navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Done", style: .plain, target: self, action: #selector(moveToNext))
self.navigationController?.navigationBar.backgroundColor = UIColor(red:0.22, green:0.46, blue:0.82, alpha:1.0)
self.navigationController?.navigationBar.topItem?.title = "Categories"
self.title = "some title"
self.navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.black]
self.navigationController?.navigationBar.isTranslucent = false
//self.transitioningDelegate
//self.translatesAutoresizingMaskIntoConstraints = false
}
@IBAction func moveToNext() {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let moveToTabBar = storyboard.instantiateViewController(withIdentifier: "TabBarViewController")
let appDelegate = UIApplication.shared.delegate as! AppDelegate
appDelegate.window?.rootViewController = moveToTabBar
}
func setFloatingButton() {
floatingButton.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(floatingButton)
floatingButton.frame.size = CGSize(width: 150, height: 50)
floatingButton.centerXAnchor.constraint(equalTo: self.view.centerXAnchor).isActive = true
floatingButton.centerYAnchor.constraint(equalTo: self.view.bottomAnchor, constant: floatingButton.frame.size.height).isActive = true
floatingButton.layer.cornerRadius = floatingButton.frame.size.height/2
floatingButton.backgroundColor = UIColor.black
floatingButton.setTitle("Done", for: .normal)
floatingButton.titleLabel?.font = UIFont.boldSystemFont(ofSize: 14)
floatingButton.setTitleColor(UIColor.white, for: .normal)
}
最佳答案
在你的约束中:
categoryTableView.topAnchor.constraint(equalTo: self.view.bottomAnchor, constant: 0.0).isActive = true
categoryTableView.bottomAnchor.constraint(equalTo: self.view.bottomAnchor).isActive = true
顶部和底部 anchor 等于 self.view.bottomAnchor
关于ios - 以编程方式呈现没有标识符的 View Controller 会导致黑屏，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/46892755/