New posts in Key Value Observing

Adding observer for KVO without pointers using Swift

Is key-value observation (KVO) available in Swift?

Key Value Observing - how to observe all the properties of an object?

KVO for whole object properties

Observing change in UIDatePicker

Why would you use an ivar?

KVO vs NSNotification vs protocol/delegates?

How to do perfect KVO for NSManagedObject?

KVO and NSMutableArray

iOS: How do I know if a property is KVO-compliant?