Andrew Bancroft • 4/23/2017

Core Data Model Attributes and NSManagedObject Property Types Must Match!

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This article discusses a common Core Data issue where mismatched types between data model attributes and NSManagedObject subclass properties cause runtime crashes. The author shares a personal experience migrating to Swift 3, highlighting how optional types (e.g., Date vs. Date?) must align exactly. It provides debugging tips using the Debug Navigator and emphasizes careful mapping to prevent EXC_BAD_INSTRUCTION errors. Aimed at iOS developers working with Core Data.

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#Type #Swift #Data Model
Core Data Model Attributes and NSManagedObject Property Types Must Match!

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