如何在 swift 3+ 中调整键盘的滚动视图

如何调整滚动视图以垂直补偿键盘？继续阅读...

是的，我知道这是一些基本信息，但今天我随机注意到，我看到的关于这个主题的所有答案都充满了信息、版本和/或到处使用刘海......但对于 Swift 来说没有什么可靠的3+。

斯威夫特 4.2：

代替滚动视图对于 UITableView、UICollectionView 等

let scrollView = UIScrollView()

添加观察员。

override open func viewDidLoad() {
    super.viewDidLoad()
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide(notification:)), name: UIResponder.keyboardWillHideNotification, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(notification:)), name: UIResponder.keyboardWillShowNotification, object: nil)
}

添加一些函数来监听通知：

@objc func keyboardWillHide(notification: Notification) {
    let contentInsets = UIEdgeInsets.zero
    scrollView.contentInset = contentInsets
    scrollView.scrollIndicatorInsets = contentInsets
}

@objc func keyboardWillShow(notification: Notification) {
    guard let keyboardFrame: CGRect = (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue else { return }
    scrollView.contentInset.bottom = keyboardFrame.height
}

值得注意的是，如果您的部署目标是 iOS 9 或更高版本，则无需再删除观察者。查看通知中心文档以获取更多信息。

deinit {
    NotificationCenter.default.removeObserver(self)
}

------------------------------------------------

Swift 3:

let scrollView = UIScrollView()

添加观察员。

override open func viewDidLoad() {
    super.viewDidLoad()
    NSNotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide(noti:)), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
    NSNotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(noti:)), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
}

添加一些函数来监听通知：

func keyboardWillHide(noti: Notification) {
    let contentInsets = UIEdgeInsets.zero
    scrollView.contentInset = contentInsets
    scrollView.scrollIndicatorInsets = contentInsets
}

func keyboardWillShow(noti: Notification) {

    guard let userInfo = noti.userInfo else { return }
    guard var keyboardFrame: CGRect = (userInfo[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue else { return }
    keyboardFrame = self.view.convert(keyboardFrame, from: nil)

    var contentInset:UIEdgeInsets = scrollView.contentInset
    contentInset.bottom = keyboardFrame.size.height
    scrollView.contentInset = contentInset
}

值得注意的是，如果您的部署目标是 iOS 9 或更高版本，则无需再删除观察者。查看通知中心文档以获取更多信息。

deinit {
    NotificationCenter.default.removeObserver(self)
}