No visible @interface for 'LifetimeConfiguration' declares the selector 'initWithMaxCount:groupName:'

[ajfigueroa]

Setup

• Xcode 9.2
• Mixed project of Swift 4 and Objective-C
• LifetimeTracker version 1.3.2 with a DEBUG configuration (I've also tried without this)
  • pod 'LifetimeTracker', :configurations => ['Debug']

Issue

I'm trying to conform a class to LifetimeTrackable so I've followed the steps in the README.md for Objective-C integration.

I get the above error when I try to use LifetimeConfiguration:

No visible @interface for 'LifetimeConfiguration' declares the
selector 'initWithMaxCount:groupName:'

In my file, I have imported the class as @import LifetimeTrackable.
I also tried importing as #import <LifetimeTracker/LifetimeTracker-Swift.h>. When I look at this file I see this generated interface for LifetimeConfiguration

/// Holds the properties which are needed to configure a <code>LifetimeTrackable</code>
SWIFT_CLASS("_TtC15LifetimeTracker21LifetimeConfiguration")
@interface LifetimeConfiguration : NSObject
- (nonnull instancetype)init SWIFT_UNAVAILABLE;
@end

Full generated interface file here

Has this been seen before? I took a look at the example and I was unable to reproduce the issue.

[krzysztofzablocki]

hmm weird, the code works fine in our objc example, can you try adding @objc attribution to the initializer in your local pod checkout and see if it helps, I didn't expect this to be needed but maybe ?

[ajfigueroa]

@krzysztofzablocki Apologies for the delay! I was able to reproduce this more reliably now that I understand it better. Adding the @objc does indeed fix the issue though.

The ExampleObjc project works fine because the pod itself is on Swift 3 as shown here.
If you run the migrator so that it converts LifetimeTracker to Swift 4 which will require no syntax change then you'll see the following deprecation warning:

This matches what is happening in my project since I have a mixed Obj-C/Swift 4 codebase which requires the explicit @objc annotations. I didn't run the migrator on the Pod when I installed it but it was automatically set to Swift 4.

I can make a PR to annotate all the public methods with @objc or should it be done on a per need basis?

[krzysztofzablocki]

a PR with annotations would be great 👍