Forked from kristopherjohnson/KeyboardNotification.swift
Created
August 10, 2017 07:42
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Swift convenience wrapper for the userInfo values associated with a UIKeyboard notification
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| import UIKit | |
| /// Wrapper for the NSNotification userInfo values associated with a keyboard notification. | |
| /// | |
| /// It provides properties retrieve userInfo dictionary values with these keys: | |
| /// | |
| /// - UIKeyboardFrameBeginUserInfoKey | |
| /// - UIKeyboardFrameEndUserInfoKey | |
| /// - UIKeyboardAnimationDurationUserInfoKey | |
| /// - UIKeyboardAnimationCurveUserInfoKey | |
| public struct KeyboardNotification { | |
| let notification: NSNotification | |
| let userInfo: NSDictionary | |
| /// Initializer | |
| /// | |
| /// :param: notification Keyboard-related notification | |
| public init(notification: NSNotification) { | |
| self.notification = notification | |
| if let userInfo = notification.userInfo { | |
| self.userInfo = userInfo | |
| } | |
| else { | |
| self.userInfo = NSDictionary() | |
| } | |
| } | |
| /// Start frame of the keyboard in screen coordinates | |
| public var screenFrameBegin: CGRect { | |
| if let value = userInfo[UIKeyboardFrameBeginUserInfoKey] as? NSValue { | |
| return value.CGRectValue() | |
| } | |
| else { | |
| return CGRectZero | |
| } | |
| } | |
| /// End frame of the keyboard in screen coordinates | |
| public var screenFrameEnd: CGRect { | |
| if let value = userInfo[UIKeyboardFrameEndUserInfoKey] as? NSValue { | |
| return value.CGRectValue() | |
| } | |
| else { | |
| return CGRectZero | |
| } | |
| } | |
| /// Keyboard animation duration | |
| public var animationDuration: Double { | |
| if let number = userInfo[UIKeyboardAnimationDurationUserInfoKey] as? NSNumber { | |
| return number.doubleValue | |
| } | |
| else { | |
| return 0.25 | |
| } | |
| } | |
| /// Keyboard animation curve | |
| /// | |
| /// Note that the value returned by this method may not correspond to a | |
| /// UIViewAnimationCurve enum value. For example, in iOS 7 and iOS 8, | |
| /// this returns the value 7. | |
| public var animationCurve: Int { | |
| if let number = userInfo[UIKeyboardAnimationCurveUserInfoKey] as? NSNumber { | |
| return number.integerValue | |
| } | |
| return UIViewAnimationCurve.EaseInOut.toRaw() | |
| } | |
| /// Start frame of the keyboard in coordinates of specified view | |
| /// | |
| /// :param: view UIView to whose coordinate system the frame will be converted | |
| /// :returns: frame rectangle in view's coordinate system | |
| public func frameBeginForView(view: UIView) -> CGRect { | |
| return view.convertRect(screenFrameBegin, fromView: view.window) | |
| } | |
| /// Start frame of the keyboard in coordinates of specified view | |
| /// | |
| /// :param: view UIView to whose coordinate system the frame will be converted | |
| /// :returns: frame rectangle in view's coordinate system | |
| public func frameEndForView(view: UIView) -> CGRect { | |
| return view.convertRect(screenFrameEnd, fromView: view.window) | |
| } | |
| } |
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