swift2 - What is the best method to store data on Apple Watch -

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i'm programming app needs store data files (or non-volatile method). have nsuserdefaults not idea case since i'm storing arrays of structs. tried storing c's fwrite() options seems inefficient. questions now: how can efficiently store data apple watch's storage swift

apple's core data persistence engine of choice complex data structures. integrated apple's other frameworks , under active development , mature.


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