ios - Scale the nib file to fullscreen on any device respecting constrains -

i have .xib file called "menu" file design view, init class doing following:

self.menuviewcontroller = [[twtmenuviewcontroller alloc] initwithnibname:@"menu" bundle:nil]; 

everything great the design visualized, size 600x600. how can it's full screen , adapts device screen size?

the nib uses autolayout , have constraints. want go full size , respect constrains.

set constraints superview or change frame (old way)

override func didmovetosuperview() {     super.didmovetosuperview()      self.translatesautoresizingmaskintoconstraints = false      nslayoutconstraint(item: self.superview!, attribute: nslayoutattribute.width, relatedby: nslayoutrelation.equal, toitem: self, attribute: nslayoutattribute.width, multiplier: 1, constant: 0).active = true     nslayoutconstraint(item: self.superview!, attribute: nslayoutattribute.height, relatedby: nslayoutrelation.equal, toitem: self, attribute: nslayoutattribute.height, multiplier: 1, constant: 0).active = true     nslayoutconstraint(item: self.superview!, attribute: nslayoutattribute.left, relatedby: nslayoutrelation.equal, toitem: self, attribute: nslayoutattribute.left, multiplier: 1, constant: 0).active = true     nslayoutconstraint(item: self.superview!, attribute: nslayoutattribute.bottom, relatedby: nslayoutrelation.equal, toitem: self, attribute: nslayoutattribute.bottom, multiplier: 1, constant: 0).active = true } 

old way:

- (void)layoutsubviews {     cgrect fr = self.frame;     fr.size = self.superview.frame.size;     self.frame = fr;      [super layoutsubviews]; } 

now autolayout constrains on view work.