ios自定义键盘高度

//增加监听，当键盘出现或改变时收出消息

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];

//增加监听，当键退出时收出消息

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];

//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;

self.contentTextView.frame = CGRectMake(self.contentTextView.left, self.contentTextView.top, self.contentTextView.width, self.view.height - self.contentTextView.top -
height);

}

////当键退出时调用

- (void)keyboardWillHide:(NSNotification *)aNotification

{

self.contentTextView.frame = CGRectMake(self.contentTextView.left, self.contentTextView.top, self.contentTextView.width, self.view.height - self.contentTextView.top - 100);

}