Question

我正在尝试在显示键盘时向上移动UIButton。因此，当显示键盘时，UIButton在显示键盘动画的同时向上移动键盘上方20px，因此看起来按钮已连接到键盘。因此，我需要确定键盘的大小，以便可以将其应用于按钮事件。这是我的代码：

 @objc func keyboardWillChange(notification: Notification) {
        if notification.name == UIResponder.keyboardWillShowNotification || notification.name == UIResponder.keyboardWillChangeFrameNotification {

            nextBtn.frame.origin.y = view.frame.maxY - 300
        } else {
            nextBtn.frame.origin.y = 0
        }
    }

我的代码有一些问题：

class Start_EmailVC: UIViewController, UITextFieldDelegate {

    var checkValid = CheckValid()

    @IBOutlet weak var nextBtn: UIButton!

    @IBOutlet weak var emailTextField: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()
        //Next Button Auth
        nextBtn.alpha = 0.5
        nextBtn.isEnabled = false

        hideIt()

        NotificationCenter.default.addObserver(self, selector: #selector(keyboardShown), name: UIResponder.keyboardWillShowNotification, object: nil);
    }

    @objc func keyboardShown(notification: NSNotification) {
        let info = notification.userInfo!
        let keyboardFrame: CGRect = (info[UIResponder.keyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
        print("keyboardFrame: \(keyboardFrame)")
    }

    func hideIt() {
        //Listen For Keyboard Events
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChange(notification:)), name: UIResponder.keyboardWillShowNotification, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChange(notification:)), name: UIResponder.keyboardWillHideNotification, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChange(notification:)), name: UIResponder.keyboardWillChangeFrameNotification, object: nil)
    }

    deinit {
        //Stop Listening for keyboard hide/show events
        NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillShowNotification, object: nil)
        NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillHideNotification, object: nil)
        NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillChangeFrameNotification, object: nil)
    }

    @objc func keyboardWillChange(notification: Notification) {
        if notification.name == UIResponder.keyboardWillShowNotification || notification.name == UIResponder.keyboardWillChangeFrameNotification {

            nextBtn.frame.origin.y = view.frame.maxY - 300
        } else {
        nextBtn.frame.origin.y = 0
    }
}}

该按钮确实向上推，但与键盘不同，只是外观不太好。

如何确定键盘尺寸迅速

0 个答案: