ios - navigationBar change titleView with animation -


i change content of titleview in navigationbar display different kinds of information, instance uisegmentedcontrol or uilabel. change of information should done transition (segmentedcontrol fades out , label fades in).

i tried add multiple uiviews in titleview , animate alpha value, it's not working.

[self.navigationitem.titleview addsubview:_mainsegmentedcontrol]; 

so tried change content during animation since value can't animated called immediately:

[uiview animatewithduration:0.2 animations:^{      _filtersegmentedcontrol.alpha = 0.0f;} completion:^(bool finished) {             [uiview animatewithduration:0.3 animations:^{                 self.navigationitem.titleview = _mainsegmentedcontrol;                 _mainsegmentedcontrol.alpha = 1.0f;             }]; }]; 

any suggestions?


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