Using the Network Link Conditioner Utility (how-to)

The Network Link Conditioner on iOS and macOS enables you to test your app in networking conditions like your users ...
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DebuggingOptimization

Core Data Debugging in Xcode using launch arguments

Core Data is Appleā€™s object graph management and persistency framework for iOS, macOS, watchOS, and tvOS. It's around for a ...
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Core DataDebugging