Corrupted string when returning new string from objective-c to swift

Question

I try to build a string from an enum in Objective-C:

+ (NSString *)getStringFromKey:(ITGenericNotification)key {
    return [NSString stringWithFormat:@"notification%lu", (long)key];
}

This code worked really well for over a year

However when I try to call it from swift with:

let notificationKey = NSNotification.getStringFromKey(ITNotificationWithObject.DidChangedQuestion.hashValue)

I get a corrupted string :

What is happening ? The value of ITGenericNotification seems to be correct,

ITGenericNotification is defined as typedef long ITGenericNotification; and is used as base type for an enum with typedef NS_ENUM(ITGenericNotification, ITNotificationWithObject)

And + (NSString *)getStringFromKey:(ITGenericNotification)key is implemented as a category to NSNotification

Answer 1

You probably want .rawValue, not .hashValue, to get the underlying integer value of the enum.

(Also the debugger variables view is sometimes wrong. When in doubt, add a println() or NSLog() to your code to verify the values of your variables.)