ios - Line appears after animating UILabel -

i performing 2 animations on myuilabel. myuilable custome class derived uilabel , have implemented drawrect method draws borders only.

this animation code:

- (void)animatelablein {     uiviewanimationoptions options = uiviewanimationoptionbeginfromcurrentstate|uiviewanimationoptionallowuserinteraction;     [uiview animatewithduration:0.1f delay:0.0 options:options animations:^{          label.transform = cgaffinetransformmakescale(1.1f, 1.1f);      } completion:^(bool finished) {         if (finished) {             [self animatelableout];         }     }]; }  - (void)animatelableout {     uiviewanimationoptions options = uiviewanimationoptionbeginfromcurrentstate|uiviewanimationoptionallowuserinteraction;     [uiview animatewithduration:0.1f delay:0.0 options:options animations:^{          label.transform = cgaffinetransformmakescale(1.0f, 1.0f);      } completion:^(bool finished) {         if (finished) {         }     }]; } 

at start of first animation grey line appears on top edge of label , persists after animations finished. want mention line isn't part of drawrect implementation , appears if drawrect empty. label bit smaller initially.

images attached not proportional.

before animations:

after animations:

any guess why happen?

finally have found problem. have changed frame of label @ time animations running. doing changes frame of label after animations finished fixed problem.