swift 監聽鍵盤彈出的高度

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      // 監聽鍵盤通知        NotificationCenter.default.addObserver(self, selector: #selector(ComposeViewController.keyboardWillChangeFrame(note:)), name: NSNotification.Name.UIKeyboardWillChangeFrame, object: nil)

    //監聽鍵盤的事件    func keyboardWillChangeFrame(note: Notification) {                print(note.userInfo ?? "")        // 1.擷取動畫執行的時間        let duration = note.userInfo?[UIKeyboardAnimationDurationUserInfoKey] as! TimeInterval                // 2.擷取鍵盤最終 Y值        let endFrame = (note.userInfo?[UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue        let y = endFrame.origin.y                //計算工具列距離底部的間距        let margin = UIScreen.main.bounds.height - y        print(margin)        // 更新約束,執行動畫        toolBarBottom.snp.updateConstraints { (make) in            make.left.equalTo(0)            make.right.equalTo(0)            make.height.equalTo(44)            make.bottom.equalTo(-margin)        }        UIView.animate(withDuration: duration) {            self.view.layoutIfNeeded()        }    }

 

swift 監聽鍵盤彈出的高度