Reddit reviews The Core iOS Developer's Cookbook (5th Edition) (Developer's Library): Core Recipes for Programmers (Developer's Library)
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Erica Saduin's The Core iOS Developer's Cookbook is a great resource as well.
AFAIK it hasn't been updated since last year but she's pretty much my go to source for Obj-C/Cocoa stuff.
She's been a Smalltalk/Obj-C hacker for over 20 years.