首先在 viewDidLoad 中添加
//增加监听，当键盘出现或改变时收到消息
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
//增加监听，当键盘退出时收到消息
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
然后实现两个通知中的方法
/**
* 功能：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 KBHeight = keyboardRect.size.height;
// ------键盘出现或改变时的操作代码
}
/**
* 功能：当键盘退出时调用
*/
- (void)keyboardWillHide:(NSNotification *)aNotification {
// ------键盘退出时的操作代码
}
