ios - How do I get auto layout to reposition a view when it's sibling view changes size? -


i have view controller 2 views (greenview, redview) , switch:

enter image description here

i have constraint on redview top space of 50px greenview. here constraints on redview:

enter image description here

i have switch when tapped toggles height of greenview 50px 100px.

when launch app, views laid out want, when switch tapped, greenview frame changes height of 50 100, redview doesn't expect - shift it's y position 50px down maintain top space constraint assigned. have inequality constraint put on bottom space of redview there no conflicts, , calling [self.redview layoutifneeded].

here's relevant code:

- (ibaction)switchtapped {  if (theswitch.ison) {      greenview.frame = cgrectmake(0, 30, 320, 100);     [redview layoutifneeded];  } else {      greenview.frame = cgrectmake(0, 30, 320, 50);     [redview layoutifneeded]; }

why isn't redview's y position being updated?

i have watched wwdc videos, seem mention calling layoutifneeded in passing. missing?

here's looks when launched:

enter image description here

and here when switch tapped:

enter image description here

there couple things causing problems. first thing autolayout supposed ignore object's frame. if want change height of something, change height constraint, not frame height. because constraints applied after layout , override frame changes. in addition, red view looks constrained superview "view" not "greenview". far editing constraints, can set iboutlet , modify constant property of uilayoutconstraint object.


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