ios - Return view to original position after animation -

i've made when user taps on text field, view shifts fields still visible while user typing. works great, after keyboard dismissed, instead of returning original position, view slides down far (leaving small blank black bar @ top). know how can restore view original position? here's code:

- (void)viewdidload {     [super viewdidload];     // additional setup after loading view, typically nib.       _userfield.returnkeytype = uireturnkeydone;     [_userfield setdelegate:self];      _passfield.returnkeytype = uireturnkeydone;     [_passfield setdelegate:self];       uitapgesturerecognizer *tap = [[uitapgesturerecognizer alloc] initwithtarget:self action:@selector(dismisskeyboard)];     [self.view addgesturerecognizer:tap]; }   - (void)dismisskeyboard {     [_userfield resignfirstresponder];     [_passfield resignfirstresponder];  }  -(void)textfieldshouldreturn:(uitextfield *)textfield {     [textfield resignfirstresponder]; }  -(void)textfielddidbeginediting:(uitextfield *)textfield {     [self animatetextfield:textfield up:yes]; }  - (void)textfielddidendediting:(uitextfield *)textfield {     [self animatetextfield:textfield up:no]; }      -(void)animatetextfield:(uitextfield*)textfield up:(bool)up     {         const int movementdistance = -130; // tweak needed         const float movementduration = 0.3f; // tweak needed          int movement = (up ? movementdistance : -movementdistance);          [uiview beginanimations: @"animatetextfield" context: nil];         [uiview setanimationbeginsfromcurrentstate: yes];         [uiview setanimationduration: movementduration];         self.view.frame = cgrectoffset(self.view.frame, 0, movement);         [uiview commitanimations];     } 

i suggest work keyboard notifications instead. way, work if have more 1 field, able animate change along keyboard animation, , know how screen estate loosing due keyboard showing.

first, in view controller, register , unregister notifications:

- (void)viewdidappear:(bool)animated {     [super viewdidappear:animated];     [[nsnotificationcenter defaultcenter] addobserver:self selector:@selector(keyboardwillshownotification:) name:uikeyboardwillshownotification object:nil];     [[nsnotificationcenter defaultcenter] addobserver:self selector:@selector(keyboardwillhidenotification:) name:uikeyboardwillhidenotification object:nil]; }  - (void)viewwilldisappear:(bool)animated {     [super viewwilldisappear:animated];     [[nsnotificationcenter defaultcenter] removeobserver:self name:uikeyboardwillshownotification object:nil];     [[nsnotificationcenter defaultcenter] removeobserver:self name:uikeyboardwillhidenotification object:nil]; } 

then implements 2 methods being called when notifications triggered:

- (void)keyboardwillshownotification:(nsnotification *)notification {     [uiview beginanimations:nil context:null];     [uiview setanimationduration:[notification.userinfo[uikeyboardanimationdurationuserinfokey] doublevalue]];     [uiview setanimationcurve:(uiviewanimationcurve)[notification.userinfo[uikeyboardanimationcurveuserinfokey] integervalue]];     [uiview setanimationbeginsfromcurrentstate:yes];     cgrect keyboardframe = [notification.userinfo[uikeyboardframeenduserinfokey] cgrectvalue];     [self.mainview adjustcontentwithkeyboardheight:keyboardframe.size.height];     [uiview commitanimations]; }  - (void)keyboardwillhidenotification:(nsnotification *)notification {     [uiview beginanimations:nil context:null];     [uiview setanimationduration:[notification.userinfo[uikeyboardanimationdurationuserinfokey] doublevalue]];     [uiview setanimationcurve:(uiviewanimationcurve)[notification.userinfo[uikeyboardanimationcurveuserinfokey] integervalue]];     [uiview setanimationbeginsfromcurrentstate:yes];     [self.mainview adjustcontentwithkeyboardheight:0];     [uiview commitanimations]; } 

finally, implement adjustcontentwithkeyboardheight public method in view. since method called in uiview animation, changes animated.

if moving views directly (put them in container view move), keep original y position in private property, subtract property keyboardheight minus remaining space below textfield, , assign field (or set frame liking):

    cgfloat offsety = keyboardheight - (cgrectgetheight(self.bounds) - cgrectgetmaxy(self.containerview.frame));     cgrect containerframe = self.containerview.frame;     containerframe.origin.y = self.containerviewpositiony - offsety;     self.containerview.frame = containerframe;