鍵盤狀態(tài)改變的時(shí)候,系統(tǒng)會(huì)發(fā)出一些特定的通知

UIKeyboardWillShowNotification//鍵盤即將顯示

UIKeyboardDidShowNotification//鍵盤顯示完畢

UIKeyboardWillHideNotification//鍵盤即將隱藏

UIKeyboardDidHideNotification//鍵盤隱藏完畢

UIKeyboardWillChangeFrameNotification//鍵盤的位置尺寸即將發(fā)生改變

UIKeyboardDidChangeFrameNotification//鍵盤的位置尺寸改變完畢

系統(tǒng)發(fā)出鍵盤通知時(shí),會(huì)附帶一下跟鍵盤有關(guān)的額外信息(字典),字典常見的key如下:

UIKeyboardFrameBeginUserInfoKey//鍵盤剛開始的frame

UIKeyboardFrameEndUserInfoKey//鍵盤最終的frame(動(dòng)畫執(zhí)行完畢后)

UIKeyboardAnimationDurationUserInfoKey//鍵盤動(dòng)畫的時(shí)間

UIKeyboardAnimationCurveUserInfoKey//鍵盤動(dòng)畫的執(zhí)行節(jié)奏(快慢)

UIKeyboardAnimationCurveUserInfoKey = 7; //動(dòng)畫執(zhí)行的節(jié)奏

UIKeyboardAnimationDurationUserInfoKey = "0.25";鍵盤彈出/隱藏的動(dòng)畫所需要的時(shí)間

UIKeyboardBoundsUserInfoKey = "NSRect: {{0, 0}, {320, 216}}”;//鍵盤的bounds

UIKeyboardCenterBeginUserInfoKey = "NSPoint: {160, 588}”;//鍵盤準(zhǔn)備彈出時(shí)的X,Y的中心坐標(biāo)

UIKeyboardCenterEndUserInfoKey = "NSPoint: {160, 372}”;//鍵盤彈出后的X,Y的中心坐標(biāo)

//鍵盤彈出剛開始的那一刻的frame

UIKeyboardFrameBeginUserInfoKey = "NSRect: {{0, 480}, {320, 216}}";

//彈出完畢的時(shí)候，鍵盤的frame

UIKeyboardFrameEndUserInfoKey = "NSRect: {{0, 264}, {320, 216}}";

//鍵盤退出的frame

//鍵盤剛要退出那一刻的frame

UIKeyboardFrameBeginUserInfoKey = "NSRect: {{0, 264}, {320, 216}}";

//鍵盤退出完畢那一刻的frame

UIKeyboardFrameEndUserInfoKey = "NSRect: {{0, 480}, {320, 216}}";

以下是swift:

extension NSNotification.Name {

public static let UIWindowDidBecomeVisible: NSNotification.Name

public static let UIWindowDidBecomeHidden: NSNotification.Name // nil

public static let UIWindowDidBecomeKey: NSNotification.Name // nil

public static let UIWindowDidResignKey: NSNotification.Name // nil

public static let UIKeyboardWillShow: NSNotification.Name

public static let UIKeyboardDidShow: NSNotification.Name

public static let UIKeyboardWillHide: NSNotification.Name

public static let UIKeyboardDidHide: NSNotification.Name

@available(iOS 5.0, *)

public static let UIKeyboardWillChangeFrame: NSNotification.Name

@available(iOS 5.0, *)

public static let UIKeyboardDidChangeFrame: NSNotification.Name