iOS键盘中英文切换键盘高度获取通知方法

- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChangeFrame:) name:UIKeyboardWillChangeFrameNotification object:nil];
}

- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillChangeFrameNotification object:nil];
}

-(void)keyboardWillChangeFrame:(NSNotification*)notification
{
NSDictionary *userInfo = [notification userInfo];
NSValue* aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];//更改后的键盘

CGRect keyboardRect = [aValue CGRectValue];
CGFloat height = keyboardRect.size.height;
NSValue *animationDurationValue = [userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];
NSTimeInterval animationDuration;
[animationDurationValue getValue:&animationDuration];

//以下为你要改变的View的Fram
myView.frame = CGRectMake(0, self.view.frame.size.height-height-50, 320, 50);
}