键盘弹出通知,以及通知的内容

监听键盘弹出:

    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardFrameChange:)
                                                 name:UIKeyboardDidChangeFrameNotification
                                               object:nil];

{name = UIKeyboardDidChangeFrameNotification; userInfo = {
    UIKeyboardAnimationCurveUserInfoKey = 7;
    UIKeyboardAnimationDurationUserInfoKey = "0.25";
    UIKeyboardBoundsUserInfoKey = "NSRect: {{0, 0}, {320, 0}}";
    UIKeyboardCenterBeginUserInfoKey = "NSPoint: {160, 568}";
    UIKeyboardCenterEndUserInfoKey = "NSPoint: {160, 568}";
    UIKeyboardFrameBeginUserInfoKey = "NSRect: {{0, 568}, {320, 0}}";
    UIKeyboardFrameEndUserInfoKey = "NSRect: {{0, 568}, {320, 0}}";
    UIKeyboardIsLocalUserInfoKey = 1;
}}

还有就是: 搜狗输入法会发3次通知.