Xcode 16 Brings Predictive Code Completion Using Custom Model
Briefly

Orr demoed Xcode's ability to suggest variable names and types based on the name of a struct by just typing the initial letter. Xcode can propose function implementations, generate functions from comments, and fill out all function arguments with meaningful values.
Xcode's predictive code completion runs locally, uses project symbols for customization, offers fast results, even offline. Apple trained a specific model for Swift and Apple's SDKs to power this feature.
Read at InfoQ
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