在安卓/iOS上打开键盘时自动调整ScrollView的大小

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var scrollView: UIScrollView!
    @IBOutlet weak var contentView: UIView!
    @IBOutlet weak var textField: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 注册键盘打开和关闭的通知
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(_:)), name: UIResponder.keyboardWillShowNotification, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide(_:)), name: UIResponder.keyboardWillHideNotification, object: nil)
        
        // 设置ScrollView的内容区域大小为contentView的大小
        scrollView.contentSize = contentView.bounds.size
    }
    
    deinit {
        // 移除通知的观察者
        NotificationCenter.default.removeObserver(self)
    }
    
    @objc func keyboardWillShow(_ notification: Notification) {
        // 获取键盘的高度
        guard let keyboardFrame = notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? CGRect else {
            return
        }
        
        // 调整ScrollView的内容区域的高度
        scrollView.contentInset = UIEdgeInsets(top: 0, left: 0, bottom: keyboardFrame.height, right: 0)
    }
    
    @objc func keyboardWillHide(_ notification: Notification) {
        // 恢复ScrollView的内容区域的高度
        scrollView.contentInset = .zero
    }
}