IOS dynamically changes the height of the UIView based on the height of the keyboard

When we use the keyboard often appear in the keyboard blocking the view of this situation, I would like to introduce a method can be based on the height of the keyboard to dynamically change the degree of view so that it can always be on the top of the keyboard

In this view I use TextView

uikeyboardwillshownotification//keyboard pop-up uikeyboardwillhidenotification//keyboard retract//popup with notification listening keyboard
[[Nsnotificationcenter Defaultcenter] addobserver:self selector: @selector (keyboarshow:) Name: Uikeyboardwillshownotification Object:nil];

Retract the listening keyboard
[[Nsnotificationcenter Defaultcenter] addobserver:self selector: @selector (keyboardhiden:) Name: Uikeyboardwillhidenotification Object:nil];

Set delegate
_mytextview.delegate=self;


Additional setup after loading the view, typically from a nib.
}
Show
-(void) Keyboarshow: (nsnotification *) notification{
Get the height of the keyboard
CGRect rect =[notification.userinfo[uikeyboardframeenduserinfokey] cgrectvalue];
Calculate the height of the TextView
CGRect Textviewrect=_mytextview.frame;
CGFloat height=textviewrect.size.height-rect.size.height;
Textviewrect.size.height=height;
[UIView animatewithduration:.2 animations:^{
Self.mytextview.frame=textviewrect;
}];} Called when the keyboard is hidden-(void) Keyboardhiden: (nsnotification *) notification{
_mytextview.frame=self.view.frame;
This will do what we want to do if you have any questions to ask. We study together

IOS dynamically changes the height of the UIView based on the height of the keyboard