Changing NSLayoutConstraint programmatically not working

1
votes

I have a subview inside a view with constraints top,left,bottom,right,width and height. I also have IBOutlet for height constraint. I want to change height constraint programmatically so it grows and push parent views. Problem is when I change constraint's constant it pushes parent view but not expand itself. But if i do it in ui editor it works fine.

White one is subview which i want to expand white one is subview which i want to expand

Constraints are here

constraints are here

Before constraints setenter image description here

After constraints set with;

self.heightConst.constant = 300;

enter image description here

1
ios7nslayoutconstraintautolayout
Validate IBOutlet, your bind not right. – Bimawa
I checked, it looks like correct. – Fatih Donmez
You have added bottom constraints for your subview then how can you change the height constraints? – Raj Subbiah
then how would it pushed parent view to expand? – Fatih Donmez
can you share simple project for look it? – Bimawa

1 Answers

0
votes

Base on your 2nd screenshot, you haven't assign your property (heightConst) to your Interface Builder (.xib or .storyboard)

and make sure your property has IBOutlet. @property (nonatomic,weak) IBOutlet NSLayoutConstraint*heightConst;