How do I create a category in Xcode 6 or higher?

How do I create a category in Xcode 6 or higher?

ios objective-c categories xcode6

objective-c

Autoresizing issue of UICollectionViewCell contentView's frame in Storyboard prototype cell (Xcode 6, iOS 8 SDK) happens when running on iOS 7 only

objective-c ios7 ios8 xcode6 uicollectionviewcell

objective-c

Importing Project-Swift.h into a Objective-C class...file not found

ios objective-c xcode swift xcode6

objective-c

Swift performSelector:withObject:afterDelay: is unavailable [duplicate]

ios objective-c swift xcode6

objective-c

How to create IPA in Xcode 6?

ios objective-c iphone xcode xcode6

objective-c

Xcode6: IBDesignable and IBInspectable with Objective-C

objective-c swift xcode6

objective-c

Xcode throws an exception in Main() in iOS 8 with 'all exceptions' breakpoint

objective-c xcode ios8 xcode6

objective-c

CFURLCopyResourcePropertyForKey failed because passed URL no scheme

objective-c ios8 xcode6

objective-c

BSXPCMessage received error for message: Connection interrupted

ios objective-c xcode uiimageview xcode6

objective-c

UIButton with IB_DESIGNABLE throws runtime attribute warning and does not render in Interface Builder

ios objective-c uibutton interface-builder xcode6

objective-c

iOS Designated Initializers : Using NS_DESIGNATED_INITIALIZER

ios objective-c xcode initialization xcode6

objective-c

Ordering unit test using XCTest in Xcode 6

ios objective-c xcode xcode6 xctest

objective-c

Xcode "Missing Submodule" warning

ios objective-c swift xcode xcode6

objective-c

scaledValueForValue: called on a font that doesn't have a text style set

ios objective-c xcode ios8 xcode6

objective-c

xcode 6 pch.file not found

objective-c xcode xcode6

objective-c