Jonah questions

Jonah answers

• automatically prevent performance regressions
• Why would someone using Core Data want to use more than one persistent store in the same Managed Object Model?
• The ultimate guide for writing parent view controllers
• Do system object delegates in ARC need to be set to nil?
• Swift equivalent of Ruby's "yield"
• iPhone - Screen Rotation?
• Does performSelectorInBackground spawn new thread for each call?
• Swift type inference and type checking issue
• Replace remote master branch with my local
• iOS: Can't set navigation bar tint color