KeyboardObserver 介绍
KeyboardObserver 是为了处理不太复杂的键盘事件。
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处理不太复杂的键盘事件。
-
不是使用NSNotification，而是使用 event。
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
}
}
}