如何在Swift 3+中调整键盘的滚动视图 [英] How to adjust your scrollview for the keyboard in swift 3+

问题描述

如何调整滚动视图以垂直补偿键盘?继续阅读...

How do you adjust your scrollview to compensate for a keyboard vertically? Read on...

是的，我知道这是一些基本信息，但是我今天随机注意到，我看到的有关该主题的所有答案到处都是信息，版本和/或到处都是刘海……但什么都没有对于Swift 3+来说是可靠的.

Yes I know this is some basic info, but I randomly noticed today that all of the answers I saw about this topic are all over the place with info, versions and/or use bangs all over the place... but nothing solid for Swift 3+.

推荐答案

Swift 4.2:

用 scrollView 代替UITableView，UICollectionView等.

Substitute scrollView for UITableView, UICollectionView, etc.

let scrollView = UIScrollView()

添加观察者.

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)
}

添加一些功能来监听通知:

Add some functions to listen for the notifications:

@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，则不再需要删除观察者.查看NotificationCenter文档以获取更多信息.

Worth noting is that if your deployment target is iOS 9 or greater, you don't need to remove the observer anymore. Check the NotificationCenter docs for more info.

deinit {
    NotificationCenter.default.removeObserver(self)
}

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

快捷键3:

let scrollView = UIScrollView()

添加观察者.

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)
}

添加一些功能来监听通知:

Add some functions to listen for the notifications:

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，则不再需要删除观察者.查看NotificationCenter文档以获取更多信息.

Worth noting is that if your deployment target is iOS 9 or greater, you don't need to remove the observer anymore. Check the NotificationCenter docs for more info.

deinit {
    NotificationCenter.default.removeObserver(self)
}

这篇关于如何在Swift 3+中调整键盘的滚动视图的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！