ios - updateViewConstraints and orientation handling -



ios - updateViewConstraints and orientation handling -

i've questions updateviewconstraints method:

why updateviewconstraints called twice @ loading of view controller? , why called when view controlle dismissed? in ios 7.1 updateviewconstraints not called when orientation changes. in ios 8 is. i'm calling updateviewconstraints in willrotatetointerfaceorientation:duration, ios 7 only. where should 1 add/remove subviews/child view controllers? i'm doing in updateviewconstraints because uideviceorientationdidchangenotification called after updateviewconstraints. views have available before new constraints added.

ios ios8 autolayout constraints uiinterfaceorientation

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