鍵盤覆寫UITextView

我有一個向上滾動 scrollView 的擴展，因此它不覆寫 UITextField，但是對于 UITextView，它不會向上滾動。擴展看起來像這樣：

extension SummaryViewController {
    
    ///Register for keyboard willHide willShow notifiication
    func registerKeyboardNotifications() {
        NotificationCenter.default.addObserver(self,
                                               selector: #selector(SummaryViewController.keyboardNotification(notification:)),
                                               name: UIResponder.keyboardWillChangeFrameNotification, object: nil)
    }
    
    @objc func keyboardNotification(notification: NSNotification) {
        
        if let userInfo = notification.userInfo {
            let endFrame = (userInfo[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue
            let duration: TimeInterval = (userInfo[UIResponder.keyboardAnimationDurationUserInfoKey] as? NSNumber)?.doubleValue ?? 0
            let animationCurveRawNSN = userInfo[UIResponder.keyboardAnimationCurveUserInfoKey] as? NSNumber
            let animationCurveRaw = animationCurveRawNSN?.uintValue ?? UIView.AnimationOptions.curveEaseInOut.rawValue
            let animationCurve: UIView.AnimationOptions = UIView.AnimationOptions(rawValue: animationCurveRaw)
            
            if (endFrame?.origin.y)! >= UIScreen.main.bounds.size.height {
                //close keyboard
                
                scrollView.contentInset = .zero
                
            } else {
                //open keyboard
                let height: CGFloat = (notification.userInfo![UIResponder.keyboardFrameEndUserInfoKey] as? CGRect)!.size.height
                scrollView.contentInset = UIEdgeInsets(top: 0, left: 0, bottom: height, right: 0)
            }
            
            UIView.animate(withDuration: duration,
                           delay: TimeInterval(0),
                           options: animationCurve,
                           animations: { self.view.layoutIfNeeded() },
                           completion: nil)
        }
    }
}

我在 viewDidLoad 中呼叫registerKeyboardNotifications()。

uj5u.com熱心網友回復：

對于UITextView它不起作用，所以我用contentOffset這樣做。

斯威夫特 5

extension SummaryViewController {
    
    private func registerKeyboardNotifications() {
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(_:)), name: UIControl.keyboardWillShowNotification, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide(_:)), name: UIControl.keyboardWillHideNotification, object: nil)
    }

    @objc func keyboardWillShow(_ notification: Notification) {
        guard let keyboardFrameValue = notification.userInfo?[UIResponder.keyboardFrameBeginUserInfoKey] as? NSValue else { return }
        let keyboardFrame = view.convert(keyboardFrameValue.cgRectValue, from: nil)
        scrollView.contentOffset = CGPoint(x: 0, y: keyboardFrame.size.height)
    }

    @objc func keyboardWillHide(_ notification: Notification) {
        scrollView.contentOffset = .zero
    }
}

uj5u.com熱心網友回復：

一種方法是設定滾動視圖的 contentOffset。當您的用戶點擊 textField 進行編輯時，您可以設定它，如下所示：

func begunEditingTextField(_ sender: UITextField) {
            let point = sender(sender, to: self.contentView)
            self.scrollView.setContentOffset(CGPoint(x: 0, y: point.y - self.view.frame.height*0.1), animated: true)
}

請注意，我添加了螢屏高度 10% 的空間作為填充。

uj5u.com熱心網友回復：

這是一個非常有用的 pod，可以避免鍵盤覆寫活動欄位。

https://github.com/michaeltyson/TPKeyboardAvoiding

只需通過在 pod 檔案中添加以下行來安裝此 pod：

pod 'TPKeyboardAvoiding'

安裝后UIScrollview，TPKeyboardAvoidingScrollView當您的鍵盤出現時，將您的類更改為現在，它會自動將您的元素移動到鍵盤上方。

標籤：迅速 滚动视图 滚动视图 迅捷5

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