复制：
- (void)registerForKeyboardNotifications{
//使用NSNotificationCenter 鍵盤出現時
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillShown:)
name:UIKeyboardWillChangeFrameNotificationobject:nil];
//使用NSNotificationCenter 鍵盤隐藏時
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillBeHidden:)
name:UIKeyboardWillHideNotificationobject:nil];
}
//实现当键盘出现的时候计算键盘的高度大小。用于输入框显示位置
- (void)keyboardWillShown:(NSNotification*)aNotification{
NSDictionary*info = [aNotificationuserInfo];
NSValue *value = [info objectForKey:UIKeyboardFrameEndUserInfoKey];
CGSizekeyboardSize = [valueCGRectValue].size;
//输入框位置动画加载
[UIView animateWithDuration:0.3 animations:^{
[UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
//self.sendView 是 输入框控件
// self.sendView.y = [] - 44 - 64 - keyboardSize.height;
}completion:^(BOOLfinished) {
}];
}
//当键盘隐藏的时候
- (void)keyboardWillBeHidden:(NSNotification*)aNotification{
[UIView animateWithDuration:0.3 animations:^{
[UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
//self.sendView 是 输入框控件
// self.sendView.y = kScreenHeight - 44 - 64;
}completion:^(BOOLfinished) {
}];
}