Scrollable Content Size Ambiguity with empty UIScrollView (XCode 6)

Question

In my project, I have multiple empty scrollview (layout with AutoLayout) in multiple view controllers. At run time, views will be add to those scrollview base on user and their desirable content. This was fine in XCode 5, IB editor never show any warning.

Recently when I update to XCode 6 to gain access to iOS 8 and new iPhone simulators. I found that all those empty scroll view that used to be ok (no warning in XCode 5) now showing warning of scrollable content size ambiguity. I check my AutoLayout and it seems ok.

Any idea what cause this?

P.S. but every thing seems ok when I run with simulator and device, no layout issue.

Phreno

Answer 1

According what you describe the ambiguity is solved in run time, so when you are designing in IB this constraints don't exists.

If you want to avoid this warning you can set intrinsic size to Placeholder in IB as shown:

Hypnos

A decade later, this is now incorrect! See 2022 answer. – Propinquity

Answer 2

For 2022:

It's changed slightly.

Here's the warning:

If you are building the scrollview/stackview in code, you'll get that warning.

Here's exactly how to get rid of the warning:

Tap on the specific scroll view in question. Go to Size Inspector (fifth button of right-hand panel), go to the bottom, tap "Ambiguity" and select "never verify"

Note that the intrinsic size placeholder mechanism is not now relevant to this problem.

Propinquity

Answer 3

1) Add a UIView inside scrollview.

2) Give constraints Leading,Trailing,Top,Bottom as 0.

3) Add two extra constraints to UIView Align to centre X and Y.

Nunuance

The whole point is when that is being done in code. – Propinquity