Question

当我按下屏幕下部的UITextField时，它会被键盘隐藏。我想做的是使用标准的iOS动画向上移动视图，以达到UITextField插入文本的位置。我正在使用 Swift 5 （Xcode 10.2）

开发应用程序

我得到的结果是，现在我可以移动视图了（比期望的要早一点），但是每次我按下UITextField时，视图都会移动，而不仅仅是被菜单项隐藏的视图。键盘。

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，那么在键盘出现后不久，视图就会向上移动，直到用户可以看到按下的UITextField。

我一直在寻找解决这个问题的方法，但是我看到的所有其他方法似乎都已经过时或没有尽我所能实现。

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
    }

}

iOS键盘隐藏UITextField

1 个答案: