ios - traitCollectionDidChange: Called even I dont have any changes -

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do know why traitcollectiondidchange called no size class changes.

selecting uilabel, have in storyboard attribute inspector / installed check uilabel. no special cases installing according size class.

therefore dont understand why traitcollectiondidchange called when rotate device?

yes, called after viewdidlod, every time rotate device/ emulator.

if wanted react rotation use viewwilltransitiontosize.

update: hmm, re-thinking this. guess size class changing when rotate iphone.

can think of traitcollectiondidchange specialised method of viewwilltransitiontosize - facilitating thresholds telling when crossing size class boundaries?

the size class change if rotate iphone, won't change if rotate ipad (which has regular size class both horizontally , vertically).

rotation considered change in interface environment, therefore traitcollectiondidchange called.


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