如何在swift 3+中調整鍵盤的滾動視圖

Question

如何調整滾動視圖以垂直補償鍵盤？請閱讀...

是的我知道這是一些基本的信息，但我今天隨機發現，我看到關於這個主題的所有答案都遍佈整個地方與信息，版本和/或使用劉海遍佈地方......但對於Swift 3+來說沒有什麼可靠的。

Answer 1

斯威夫特3：

let scrollView = UIScrollView() 

添加觀察員。

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

添加一些功能，以監聽通知：

//--------------------------------- 
// MARK: - Notification Center 
//--------------------------------- 

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，如果你的部署目標是iOS的9或更高版本，您不需要再刪除觀察者。查看NotificationCenter文檔以獲取更多信息。

deinit { 
    NotificationCenter.default.removeObserver(self) 
} 

Answer 2

的修改，使其在iOS上11的工作是使用UIKeyboardFrameEndUserInfoKey而非UIKeyboardFrameBeginUserInfoKey。只需簡單的方法來解答@satshshin的解決方案：

@objc func keyboardWillShow(_ notification: NSNotification) {     
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue { 
     scrollView.contentInset.bottom = keyboardSize.height 
    } 
} 

@objc func keyboardWillHide(_ notification: NSNotification) {   
    scrollView.contentInset.bottom = 0 
}