Auto Layout: Conflicting explicit width and required content hugging constraints don't throw an exception
| Originator: | lithium3141 | ||
| Number: | rdar://15106765 | Date Originated: | 28-Sep-2013 05:12 PM |
| Status: | Open | Resolved: | |
| Product: | iOS SDK | Product Version: | Xcode 5.0 (5A1412) / iOS 7.0 |
| Classification: | Other Bug | Reproducible: | Always |
Summary:
The Auto Layout system fails to throw an exception when a view:
• Has a constant intrinsic width
• Has a content hugging priority of 1000 ("required")
• Has an explicit width constraint different from its intrinsic width, also required
Steps to Reproduce:
1. Create a new application from the Empty Application template
2. Add a subclass of UIView that returns a constant CGSize as its intrinsicContentSize (e.g. 50x50)
3. Add an instance of this subclass as a subview of the app's window
4. Set the view's content hugging priority to required along the horizontal axis
5. Add a required constraint to the view setting its width to a value different from its intrinsic content width
6. Run the app
Expected Results:
Auto Layout should determine that the required content hugging & width constraints conflict and throw an exception.
Actual Results:
The app runs without throwing an exception. The view respects the explicit width constraint, ignoring its required content hugging.
Comments
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