swift - 当键盘存在时，选择导致 View 向上滑动的原因

Question

我有一个 tableView，在第 0 行有一个 textField，在第 3 行有一个 textView。我的 tableview 目前每次出现键盘时都会向上滑动。当 tableView 向上滑动时，您看不到第 0 行中的 textField。如何为第 0 行禁用此功能并仅保留第 3 行？我尝试使用 Protocol & Delegates 来尝试只为第 3 行封装函数，但这不起作用。

类 CreateEditItemController: UIViewController, CreateItemDescriptionCellDelegate {

@IBOutlet weak var tableView: UITableView!

func handleKeyboardShow(notification: NSNotification) {
    if let keyboardSize = (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {

        if self.view.frame.origin.y == 0 {
            //self.view.frame.origin.y -= keyboardSize.height
            self.view.frame.origin.y -= 200
        }
    }
}

func handleKeyboardHide(notification: NSNotification) {
    if self.view.frame.origin.y != 0 {
        self.view.frame.origin.y = 0
    }
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    switch indexPath.row {
    ...
    case 3:
        let cell = tableView.dequeueReusableCell(withIdentifier: "CreateItemDescriptionCell", for: indexPath) as! CreateItemDescriptionCell
        cell.delegate = self
        return cell
    default:
        return tableView.cellForRow(at: indexPath)!
     }
   }
 }


protocol CreateItemDescriptionCellDelegate: class {
    func handleKeyboardShow(notification: NSNotification)
    func handleKeyboardHide(notification: NSNotification)
}

class CreateItemDescriptionCell: UITableViewCell, UITextViewDelegate {
//IBOUTLETS
@IBOutlet weak var notesTextView: UITextView!
weak var delegate: CreateItemDescriptionCellDelegate?

override func awakeFromNib() {
    super.awakeFromNib()
    notesTextView.delegate = self

    NotificationCenter.default.addObserver(self, selector: #selector(handleKeyboardShow), name: UIResponder.keyboardWillShowNotification, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(handleKeyboardHide), name: UIResponder.keyboardWillHideNotification, object: nil)

}

@objc func handleKeyboardShow(notification: NSNotification) {
    delegate?.handleKeyboardShow(notification: notification)
}

@objc func handleKeyboardHide(notification: NSNotification) {
    delegate?.handleKeyboardHide(notification: notification)
 }
}

Answer 1

经过一些数学运算后，您尝试做的事情是可能的，但我建议为此使用第三方 pod，而不是在 evert Controller 上手动执行此操作。

将此添加到您的 pod 文件中:

# IQKeyboardManager: Codeless drop-in universal library allows to prevent issues of keyboard sliding up
# https://github.com/hackiftekhar/IQKeyboardManager
pod 'IQKeyboardManagerSwift'   

更多详细信息和文档 View : https://github.com/hackiftekhar/IQKeyboardManager

你唯一需要写的行是:

// Enabling IQKeyboardManager
IQKeyboardManager.shared.enable = true

在

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool 

这将解决您所有的问题，您无需计算帧数或任何其他内容。