Xcode 7.2: Swift IBOutlet Collection [UIButton]! Leaks Memory

Originator:joe
Number:rdar://24272775 Date Originated:21-Jan-2016 12:01 AM
Status:Open Resolved:
Product:Developer Tools Product Version:Xcode 7.2 (7C68)
Classification:Serious Bug Reproducible:Always
 
Summary:
When creating an IBOutlet Collection of UIButtons using Swift, it creates a constant leak in memory. Every access leaks memory I believe due to the forced bridge to ObjectiveC.

Steps to Reproduce:
1. Create new single view swift project.
2. Add multiple UIButtons in Interface Builder.
3. Connect them to an IBOutletCollection in the ViewController.swift file.
4. Hit Command+i to run Instruments.
5. Select Leaks as the profiling template.
6. Hit the record button.
7. Leaks!

Expected Results:
No leaks.

Actual Results:
Leaks.

Notes:
Workaround is to replace [UIButton]! with an NSArray! and use your own logic to cast the objects to UIButtons or your subclass.

Comments

As a workaround, if you use NSArray! as opposed to [UIButton]!, then this will get rid of the memory leaks.

By timj at April 12, 2016, 6:51 p.m. (reply...)

About this bug

Hi, this bug is still existent in the latest Xcode 7.3 beta and I would like it if it got fixed because we are working on a framework that allows people to make apps very easily and we rely heavily on outlet collections.

By REVLAppInfo at Feb. 25, 2016, 12:05 a.m. (reply...)

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