objective c - Center the subview in UIView using constraints in IOS -

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i have 3 subview subview1,subview2,subview3 in uiviewcontroller inside uiview.

i'm using constraints on them, constraints i'm using show in center when button clicked these,

  • horizantally in container,
  • vertically in container,
  • width and
  • height.

issue :

when run app , click button once comes in right position. when dismiss , try again open it, subview change position , comes on top left of uiviewcontroller ,

as can see in screen shot, want show view every time when click button in center of uiviewcontroller.

i'm confused constraints right why changes position when open again.

image

my code ,

    - (ibaction)precord:(id)sender {         _dateview.hidden=no;         [self.dateview bounceintoview:self.view direction:dcanimationdirectionleft];     }

the contents in story board , enter image description here

it depends on way dismissing view. tried below code , worked me

- (ibaction)btn_tapped:(id)sender { _smallview.hidden = false; [_smallview bounceintoview:self.view direction:dcanimationdirectionleft]; }  - (ibaction)hide_tapped:(id)sender { _smallview.hidden = true; }

basically hiding view. , when btn_tapped, everytime view displaying bouncing animation in center. let me know how go!





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