AppCode says "Casting to probably incompatible type" when I'm explicitly checking the type

Asked Jan 21 '21 at 20:49

Active Jan 21 '21 at 20:49

Viewed 54 times

for (NSPropertyDescription *property in [[self entity] properties]) {       
        if ([property isKindOfClass:NSAttributeDescription.class]) {
            NSAttributeDescription *attributeDescription = (NSAttributeDescription *)property;

AppCode is giving me the warning Casting to probably incompatible type on the last line of the code snippet above. Why?

I'm iterating over a list of NSPropertyDescription objects. NSAttributeDescription is a subclass of NSPropertyDescription. I check if the property isKindOfClass before casting it.

Is this just a bug in AppCode or does it know something I don't and warning me about a danger I'm not familiar with?

asked Jan 21 '21 at 20:49

Kenny Wyland

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I copy/paste your sample in XCode, and didn't have the warning. – Larme Jan 21 '21 at 21:48
@Larme I didn't say that Xcode was giving me the warning. I said AppCode was giving me the warning. – Kenny Wyland Jan 21 '21 at 22:27
1

I thought you didn’t test in Xcode and wanted to confirm you it’s specific maybe to AppCode. – Larme Jan 21 '21 at 22:31

AppCode says "Casting to probably incompatible type" when I'm explicitly checking the type

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