ios - Container view transitions between UITableViewController and UIViewController, why are the bounds messed up? -


i trying implement flip between 2 view controllers embedded container view. in real app, flip button swaps between map , list.

in mockup of problem, coffee uitableviewcontroller swapped out sweets uiviewcontroller.

layout in ib

it works fine in simple case, when add segue sweets controller go child uiviewcontroller, things go awry after following actions - flip - segue - - flip. repeat actions , tableview makes way down off screen.

space appears between nav bar , tableview

the code in flipviewcontroller is:

@interface flipviewcontroller () @property (strong, nonatomic) uiviewcontroller *controller1; @property (strong, nonatomic) uiviewcontroller *controller2; @property (strong, nonatomic) uiviewcontroller *currentviewcontroller; @end  @implementation flipviewcontroller  - (void)viewdidload {     [super viewdidload];      self.controller1 = [self.childviewcontrollers firstobject];     self.currentviewcontroller = self.controller1;      uistoryboard *storyboard = [uistoryboard storyboardwithname:@"storyboard" bundle:nil];     self.controller2 = [storyboard instantiateviewcontrollerwithidentifier:@"sweets controller"];     [self addchildviewcontroller:self.controller2]; }   - (ibaction)flip:(id)sender {     if (self.currentviewcontroller == self.controller1) {         [self transitionfromviewcontroller:self.controller1 toviewcontroller:self.controller2 duration:0.3 options:uiviewanimationoptiontransitionflipfromright animations:nil completion:^(bool finished) {             [self.controller2 didmovetoparentviewcontroller:self];             self.currentviewcontroller = self.controller2;         }];     }     else {         [self transitionfromviewcontroller:self.controller2 toviewcontroller:self.controller1 duration:0.3 options:uiviewanimationoptiontransitionflipfromright animations:nil completion:^(bool finished) {             [self.controller2 didmovetoparentviewcontroller:self];             self.currentviewcontroller = self.controller1;         }];     } } @end

some debugging seems indicate bounds of uitableview getting confused upon return. have autolayout problem or approach transitionfromviewcontroller: wrong way go getting effect? suggestions appreciated, i've been stuck on bug long!?


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