Xcode-Beta (6D520o)/Swift: UIControl.addTarget(action:forControlEvents) accepts a private action method but crashes at runtime with unrecognized selector

Originator:andrew
Number:rdar://19886763 Date Originated:19-Feb-2015 10:32 AM
Status:Open Resolved:
Product:Developer Tools Product Version:Xcode-Beta (6D520o)
Classification:Other Bug Reproducible:Always
 
Summary:

When adding a target to a UIControl object via addTarget(action:forControlEvents), it accepts a private method as the action parameter, but then crashes at runtime with an unrecognized selector.

Steps to Reproduce:

1. Write a private function
2. Add it as a target of a UIControl object
3. Trigger the appropriate control event
4. Observe unrecognized selector crash

Expected Results:

The code should either not compile OR compile with a warning OR it should be possible to use a private method, so you don’t have to expose what might be an internal implementation detail.

Actual Results:

No compilation warning and a runtime crash. This is a missed opportunity for the Swift language to catch a potential bug earlier in the development cycle.

Regression:

N/A

Notes:

N/A

Comments


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