KeyboardObserver是为了处理不太复杂的键盘事件。
特性：处理不太复杂的键盘事件。
不是使用NSNotification，而是使用event。
区别：不用KeyboardObserver.swift
let keyboardNotifications = [ UIKeyboardWillShowNotification, UIKeyboardWillHideNotification, UIKeyboardWillChangeFrameNotification]override func viewDidLoad() { super.viewDidLoad()}override func viewWillAppear(animated: Bool) { super.viewWillAppear(animated) keyboardNotifications.forEach { NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardEventNotified:", name: $0, object: nil) }}override func viewWillDisappear(animated: Bool) { super.viewWillDisappear(animated) keyboardNotifications.forEach { NSNotificationCenter.defaultCenter().removeObserver(self, name: $0, object: nil) }}func keyboardEventNotified(notification: NSNotification) { guard let userInfo = notification.userInfo else { return } let keyboardFrameEnd = (userInfo[UIKeyboardFrameEndUserInfoKey] as! NSValue).CGRectValue() let curve = UIViewAnimationOptions(rawValue: UInt(userInfo[UIKeyboardAnimationCurveUserInfoKey] as! NSNumber)) let duration = NSTimeInterval(userInfo[UIKeyboardAnimationDurationUserInfoKey] as! NSNumber) let distance = UIScreen.mainScreen().bounds.height - keyboardFrameEnd.origin.y let bottom = distance >= bottomLayoutGuide.length ? distance : bottomLayoutGuide.length UIView.animateWithDuration(duration, delay: 0.0, options: [curve], animations: { [weak self] () -> Void in self?.textView.contentInset.bottom = bottom self?.textView.scrollIndicatorInsets.bottom = bottom } , completion: nil)}用KeyboardObserver.swift
let keyboard = KeyboardObserver()override func viewDidLoad() { super.viewDidLoad() keyboard.observe { [weak self] (event) -> Void in guard let s = self else { return } switch event.type { case .WillShow, .WillHide, .WillChangeFrame: let distance = UIScreen.mainScreen().bounds.height - event.keyboardFrameEnd.origin.y let bottom = distance >= s.bottomLayoutGuide.length ? distance : s.bottomLayoutGuide.length UIView.animateWithDuration(event.duration, delay: 0.0, options: [event.curve], animations: { [weak self] () -> Void in self?.textView.contentInset.bottom = bottom self?.textView.scrollIndicatorInsets.bottom = bottom } , completion: nil) default: break } }}
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