使用 (void)keyboardWillShow:(NSNotification *)aNotification 获取搜狗输入法的信息时，得到的信息如下，键盘的高度为0.

 {
    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}}";
}

在键盘消失的方法(void)keyboardWillHide:(NSNotification *)aNotification
却能获取键盘的高度。

求问大神，这个问题怎么解决？