ios - UITabBarControllerDelegate's method is not called -

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i create programmatically uitabbarcontroller more 5 tabs (exactly 8 child view controllers).

my purpose custom transition animation tab changing. setup delegate uitabbarcontroller , implement method: 

- (nullable id <uiviewcontrolleranimatedtransitioning>)tabbarcontroller:(uitabbarcontroller *)tabbarcontroller             animationcontrollerfortransitionfromviewcontroller:(uiviewcontroller *)fromvc                                               toviewcontroller:(uiviewcontroller *)tovc

when select tab sending:

[tabbarcontroller setselectedindex: 6];

delegate's method not called.

delegate's method called when send 

[tabbarcontroller setselectedindex: 3];

for example, i.e. visible tab.

one more remark: if selected view controller in visible range 0..3 , next view out of visible range 0..3 delegate's method still called. in case when selected view controller out of visible range 0..3 , next view out of visible range 0..3 delegate's method not called. , lose custom transition animation. problem.

i tried send 

[tabbarcontroller setselectedviewcontroller: someviewcontroller];

instead of 

[tabbarcontroller setselectedindex: 6];

it doesn't work.

you have many tabs use selectedindex, other tabs in morenavigationcontroller if morenavigationcontroller not displayed on screen - meaning should return nsnotfound when using selectedindex.

you should use selectedviewcontroller instead, per ios docs

[tabbarcontroller setselectedviewcontroller: yourindexsixviewcontroller];




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