获取键盘的高度

//当键盘出现或改变时调用

- (void)keyboardWillShow:(NSNotification *)aNotification

{

//获取键盘的高度

NSDictionary *userInfo = [aNotification userInfo];

NSValue *aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];

CGRect keyboardRect = [aValue CGRectValue];

int height = keyboardRect.size.height;

}