ios - Where are constraints updated for size classes? -


i have constraint in interface builder default value , compact width value. have constraint linked iboutlet can constant value in code @ runtime. if run on iphone 4s simulator, in viewdidload constant default value. neither willtransitiontotraitcollection or viewwilltransitiontosize called, @ point constraint updated compact value later on correct. constraint updated uiviewcontroller? it's not updateviewconstraints.

update: suggested viewdidlayoutsubviews , traitcollectiondidchange methods not constant changed either:

override func viewdidlayoutsubviews() {     println("before viewdidlayoutsubviews: \(self.navcontrollerbottomspaceconstraint.constant)")     super.viewdidlayoutsubviews()     println("after viewdidlayoutsubviews: \(self.navcontrollerbottomspaceconstraint.constant)") }  override func traitcollectiondidchange(previoustraitcollection: uitraitcollection?) {     println("before traitcollectiondidchange: \(self.navcontrollerbottomspaceconstraint.constant)")     super.traitcollectiondidchange(previoustraitcollection)     println("after traitcollectiondidchange: \(self.navcontrollerbottomspaceconstraint.constant)") }

output:

before viewdidlayoutsubviews: 20.0 after viewdidlayoutsubviews: 20.0 before viewdidlayoutsubviews: 20.0 after viewdidlayoutsubviews: 20.0 before viewdidlayoutsubviews: 20.0 after viewdidlayoutsubviews: 20.0 before viewdidlayoutsubviews: 20.0 after viewdidlayoutsubviews: 20.0 before traitcollectiondidchange: 20.0 after traitcollectiondidchange: 20.0 before viewdidlayoutsubviews: 0.0 after viewdidlayoutsubviews: 0.0 before viewdidlayoutsubviews: 0.0 after viewdidlayoutsubviews: 0.0

thanks matt , sega-zero pointing me in right direction.

the answer constraint updated in view's first layoutsubviews after has entered view hierarchy. in view controller can this:

override func viewdidlayoutsubviews() {     if self.propertycalculatedfromconstraints == nil && self.view.window != nil {         // constraints , sizes valid         self.propertycalculatedfromconstraints = self.constraint.constant     }     super.viewdidlayoutsubviews() }  override func viewdiddisappear() {     self.propertycalculatedfromconstraints = nil     super.viewdiddisappear() }

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