iOS键盘隐藏了UITextField

Question

当我按下位于屏幕下方的UITextField时，键盘会隐藏它。我想要做的是使用标准iOS动画向上移动视图，到达我插入一些文本的UITextField。我在Swift 5中开发应用程序（Xcode 10.2）

我已经达到的结果是现在我可以移动视图（比想要的早一点），但每次按下UITextField时视图都会移动，而不仅仅是键盘隐藏的视图。

class ViewController: UIViewController {
    deinit {
        NotificationCenter.default.removeObserver(self)
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(notification:)), name: UIResponder.keyboardWillShowNotification, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide(notification:)), name: UIResponder.keyboardWillHideNotification, object: nil)
    }

    @objc func keyboardWillShow(notification: NSNotification) {
        guard let userInfo = notification.userInfo else {
            return
        }

        guard let keyboardSize = userInfo[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue else {
            return
        }

        let keyboardFrame = keyboardSize.cgRectValue

        if self.view.frame.origin.y == 0 {
            self.view.frame.origin.y -= keyboardFrame.height
        }
    }

    @objc func keyboardWillHide(notification: NSNotification) {
        guard let userInfo = notification.userInfo else {
            return
        }

        guard let keyboardSize = userInfo[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue else {
            return
        }

        let keyboardFrame = keyboardSize.cgRectValue

        if self.view.frame.origin.y != 0 {
            self.view.frame.origin.y += keyboardFrame.height
        }
    }
}

我想要获得的结果是，如果用户按下将被键盘隐藏的UITextField，那么，在键盘出现后稍微移动，视图会向上移动，直到用户可以看到已按下的UITextField。

我已经搜索了很长时间以解决这个问题但我见过的所有其他人似乎已经过时或没有做我想要实现的目标。

Answer 1

您可以尝试使用scrollview：

import UIKit

class ViewController: UIViewController {

    @IBOutlet var scrollView: UIScrollView!


    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.

        NotificationCenter.default.addObserver(self,selector:#selector(self.keyboardWillShow),name:UIResponder.keyboardDidShowNotification, object: nil)
        NotificationCenter.default.addObserver(self,selector: #selector(self.keyboardWillHide),name:UIResponder.keyboardDidHideNotification, object: nil)

    }

    @objc func keyboardWillShow(notification: Notification) {

        guard let userInfo = notification.userInfo,

            let frame = (userInfo[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue
            else{
                return

        }

        let contentInset = UIEdgeInsets(top: 0, left: 0, bottom: frame.height, right: 0)

        scrollView.contentInset = contentInset

    }

    @objc func keyboardWillHide(notification: Notification)

    {
        scrollView.contentInset = UIEdgeInsets.zero
    }

}