Unable to make outlet connection to a constraint in IB

ios interface-builder nslayoutconstraint outlet
johnnyspo picture johnnyspo · Feb 28, 2014 · Viewed 21k times · Source

I am running XCode 5 with iOS 7. I need to dynamically change the height constraint of a UITextView prior to its layout. I have seen many postings stating that this can be done by making an outlet connection from the constraint in IB to the source code. I am trying to make the connection from the constraint outlet in IB to the header file of the owning class, but am unable to make the connection - IB does not "highlight" when I drag over the header file, as it does when making connections from other objects like buttons etc.

Has anyone encountered this before? All help is greatly appreciated.

Answer

matt picture matt · Mar 1, 2014

Here is a picture of me doing it. I'm control-dragging from the constraint to the header file.

enter image description here

In real life I'm more likely to control-drag to the anonymous category in the implementation file, because I don't want an IBOutlet property to be public. So here's a picture of that too. Sorry, this screen shot does not show the cursor: it is at the bottom end of the stretch line.

enter image description here

Related questions

AutoLayout to keep view sizes proportional

I'm trying to achieve the following: I have 2 views in my xib that need to stay 20 pixels off the edge (both sides and top) The 2 views that need to resize aren't the same size They have to be 20 pixels apart …

Read More
"Width equals height" constraint in Interface Builder

I can't find a way to create a 'square' constraint, meaning 'width equals height' in Interface Builder. I guess it's possible to add such constraint programmatically. Is there something I can do in IB? Maybe I just don't see it? …

Read More
Install/Uninstall constraint programmatically

Is there a way to install and uninstall an Xcode interface builder constraint programmatically?

Read More