Ios Swift:来自UIViewController扩展的RegisterWorkeryBoardNotification_Ios_Swift_Keyboard

Ios Swift:来自UIViewController扩展的RegisterWorkeryBoardNotification

ios swift keyboard

Ios Swift:来自UIViewController扩展的RegisterWorkeryBoardNotification,ios,swift,keyboard,Ios,Swift,Keyboard,我正在尝试清理代码，创建并扩展到UIViewController，以注册和注销我的键盘。在我的实用程序文件中，我有以下内容： extension UIViewController { //Register the keyboard for notifications in viewDidLoad func registerForKeyboardNotifications() { //Adding notifies on keyboard appearin

我正在尝试清理代码，创建并扩展到

UIViewController

，以注册和注销我的键盘。在我的实用程序文件中，我有以下内容：

extension UIViewController {
     //Register the keyboard for notifications in  viewDidLoad
     func registerForKeyboardNotifications() {

         //Adding notifies on keyboard appearing
         NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(CreateEventVC.keyboardWasShown(_:)), name: UIKeyboardWillShowNotification, object: nil) 
         NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(CreateEventVC.keyboardWillBeHidden(_:)), name: UIKeyboardWillHideNotification, object: nil)

     }

     //Deregister the keyboard for notification in viewWillDisapper
     func deregisterFromKeyboardNotifications() {

         //Removing notifies on keyboard appearing
         NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillShowNotification, object: nil)
         NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillHideNotification, object: nil)
     }
}

我需要的是

选择器中的“CreateEventVC”作为当前类
然后我在我的ViewController中调用它，如下所示：
override func viewDidLoad() {
         super.viewDidLoad()

         //Register Keyboard
         registerForKeyboardNotifications()
}

override func viewWillDisappear(animated: Bool) {

    deregisterFromKeyboardNotifications()

}

func keyboardWasShown(notification: NSNotification) {

    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {

        self.view.frame.origin.y -= keyboardSize.height

    }

}

func keyboardWillBeHidden(notification: NSNotification) {

    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {

        self.view.frame.origin.y += keyboardSize.height

    }

}

我觉得这不是最好的做法。任何帮助或建议都会很好
 我正在使用UIViewController
和UIScrollView
扩展。如果要移动UIView
，也可以使用此扩展，但使用UIScrollView
更方便，因为它不会弄乱视图边界，并且如果需要添加更多文本字段，这种方法更通用
extension UIViewController {
    func registerForKeyboardDidShowNotification(usingBlock block: ((NSNotification, CGSize) -> Void)? = nil) {
        NSNotificationCenter.defaultCenter().addObserverForName(UIKeyboardDidShowNotification, object: nil, queue: nil, usingBlock: { (notification) -> Void in
            let userInfo = notification.userInfo!
            guard let keyboardSize = userInfo[UIKeyboardFrameBeginUserInfoKey]?.CGRectValue.size else { fatalError("Can't grab the keyboard frame") }

            block?(notification, keyboardSize)
        })
    }

    func registerForKeyboardWillHideNotification(usingBlock block: (NSNotification -> Void)? = nil) {
        NSNotificationCenter.defaultCenter().addObserverForName(UIKeyboardWillHideNotification, object: nil, queue: nil, usingBlock: { (notification) -> Void in
            block?(notification)
        })
    }
}

因此，使用这段代码，在您的UIViewController
的viewDidLoad（）
方法中，您可以注册键盘通知，并在块中添加任何附加函数。像这样：
override func viewDidLoad() {
    super.viewDidLoad()

    registerForKeyboardDidShowNotification { notif, size in
        self.view.frame.origin.y -= size.height
    }

    registerForKeyboardWillHideNotification { notif in
        self.view.frame.origin.y = 0
    }
}


编辑：（对于UIScrollView）
1） 你能用动画显示键盘吗
实际上，键盘的外观总是动画的，所以我想你说的是滚动视图的调整。是的，你可以。下面我发布了更新的UIViewController
和UIScrollView
扩展，它们正在处理这个问题
2） 我需要注销键盘吗
好吧，这是一个很好的实践，以避免在未来的崩溃。为此，您可能更愿意在视图中添加通知，并在视图中删除通知
    NSNotificationCenter.defaultCenter().removeObserver(scrollView, name: UIKeyboardDidShowNotification, object: nil)
    NSNotificationCenter.defaultCenter().removeObserver(scrollView, name: UIKeyboardWillHideNotification, object: nil)

3） 对于UIScrollView方法，我会将所有对象放在屏幕的滚动视图中，然后在每个UITextField成为第一响应程序时以编程方式滚动视图吗
您不会以编程方式滚动任何内容。您需要做的是更改UIScrollView
的插入，它将自动使第一响应者在屏幕上可见
这是我在项目中使用的代码：
extension UIViewController {
    func registerForKeyboardDidShowNotification(scrollView: UIScrollView, usingBlock block: (CGSize? -> Void)? = nil) {
        NSNotificationCenter.defaultCenter().addObserverForName(UIKeyboardDidShowNotification, object: nil, queue: nil, usingBlock: { (notification) -> Void in
            let userInfo = notification.userInfo!
            let keyboardSize = userInfo[UIKeyboardFrameEndUserInfoKey]?.CGRectValue.size
            let contentInsets = UIEdgeInsetsMake(scrollView.contentInset.top, scrollView.contentInset.left, keyboardSize!.height, scrollView.contentInset.right)

            scrollView.setContentInsetAndScrollIndicatorInsets(contentInsets)
            block?(keyboardSize)
        })
    }

    func registerForKeyboardWillHideNotification(scrollView: UIScrollView, usingBlock block: (Void -> Void)? = nil) {
        NSNotificationCenter.defaultCenter().addObserverForName(UIKeyboardWillHideNotification, object: nil, queue: nil, usingBlock: { (notification) -> Void in
            let contentInsets = UIEdgeInsetsMake(scrollView.contentInset.top, scrollView.contentInset.left, 0, scrollView.contentInset.right)
            scrollView.setContentInsetAndScrollIndicatorInsets(contentInsets)
            block?()
        })
    }
}



extension UIScrollView {
    func setContentInsetAndScrollIndicatorInsets(edgeInsets: UIEdgeInsets) {
        self.contentInset = edgeInsets
        self.scrollIndicatorInsets = edgeInsets
    }
}

在您的视图中将出现方法，只需按如下方式添加它：
registerForKeyboardWillShowNotification(scrollView)
registerForKeyboardWillHideNotification(scrollView)

每当键盘出现时，它将收缩scrollview的contentInset；每当键盘消失时，它将展开scrollview。
以下是Swift 4扩展，其中有一种方法需要将约束放入其中：
import UIKit

extension UIViewController {

    func bindKeypad(to constraint: NSLayoutConstraint) {
        NotificationCenter.default.addObserver(forName: Notification.Name.UIKeyboardWillShow, object: nil, queue: OperationQueue.main) { [weak self, weak constraint] notification in
            guard let info = notification.userInfo else { return }
            guard let height = (info[UIKeyboardFrameEndUserInfoKey] as? CGRect)?.size.height else { return }
            guard constraint?.constant != height else { return }
            constraint?.constant = height
            self?.view.layoutIfNeeded()

        }

        NotificationCenter.default.addObserver(forName: Notification.Name.UIKeyboardWillHide, object: nil, queue: OperationQueue.main) { [weak self, weak constraint] _ in
            guard constraint?.constant != 0 else { return }
            constraint?.constant = 0
            self?.view.layoutIfNeeded()
        }
    }
}

在你们班上的Denit call上：
deinit {
        NotificationCenter.default.removeObserver(self)
    }

要在viewDidLoad中使用它，请执行以下操作：
bindKeypad(to: bottomKeypadConstraint)

我认为我们可以创建包含键盘事件的BaseController，我们必须从中继承viewController，并覆盖像viewWiillAppear这样的键盘方法（键盘将出现或键盘将消失）
要求
class BaseController: UIViewController {
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        NotificationCenter.default.addObserver(self, selector: #selector(keyBoardWillShow(notification:)), name: .UIKeyboardWillShow, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(keyBoardWillHide(notification:)), name: .UIKeyboardWillHide, object: nil)
    }

    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        NotificationCenter.default.removeObserver(self, name: .UIKeyboardWillShow, object: nil)
        NotificationCenter.default.removeObserver(self, name: .UIKeyboardWillHide, object: nil)
    }

    //****************************************************
    //MARK: - Keyboard event listener
    //****************************************************

    @objc func keyBoardWillShow(notification: NSNotification) {
       //Override this method
    }

    @objc func keyBoardWillHide(notification: NSNotification) {
        //Override this method
    }
}

如何使用
class ViewController:BaseController {
    override func keyBoardWillHide(notification: NSNotification) {
        // Do something
    }
    override func keyBoardWillShow(notification: NSNotification) {
        // Do something
    }
}

谢谢你的回答。几个问题：1）你能为键盘显示动画吗？2） 我需要注销键盘吗？3） 对于UIScrollView
方法，当每个UITextField
成为第一响应者时，我会将所有对象放在屏幕的滚动视图中，然后通过编程滚动视图吗？再次感谢@Manstof好的，我将更新我的UIScrollView
的答案。我一直在使用您提供的所有答案，UIScrollView
工作得最好！谢谢谢谢你@noir。这解决了我的目的。考虑把它转换成最新的SWIFT语法。做了一个编辑，在等待评论：但是调用Suff.VIEW会出现在VIEWS WORKWORD函数中会引起一些棘手的问题。所以你可能不想复制粘贴这个.Yo@adams.s thnx