ios - NSLayoutConstraint change not working -


i have code below changing nslayoutconstraint delay. value changing without delay , animation. please let me know issue code.

self.heightconstraint.constant = 100; [self.animatingview setneedsupdateconstraints]; [uiview animatewithduration:3.0 delay:1.0 options:uiviewanimationoptioncurveeaseout animations:^{     [self.animatingview layoutifneeded]; } completion:^(bool finished) {  }];

try calling layoutifneeded method on superview of animatingview.


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