Jonah questions

Jonah answers

• 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
• How to change sequence of button in UIActionsheet in iPhone?
• When to use -retainCount?
• Xcode 6.3 - Auto property synthesis will not synthesize property