ios - Programatically switching tabs using selectedViewController property -

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i've used search already, haven't found answer.

trying switch this:

[self. tabbarcontroller.selectedviewcontroller optionsviewcontorller];

and this:

 [self.tabbarcontroller.selectedviewcontroller = self.tabbarcontroller.viewcontrollers     objectatindex:3];

but doesn't work, tried , advice change 

self.tabbarcontroller.selectedindex

but changes @ tab bar not view.

this should work. 

self.tabbarcontroller.selectedviewcontroller = [self.tabbarcontroller.viewcontrollers objectatindex:3];

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