How is memory management done in iOS Swift?
Automatic Reference Counting is used by Swift (ARC) in order to do memory management. This is the same thing in Swift as it is in Objective C in terms of notion. When you assign or unassign instances of classes (reference types) to constants, properties, and variables, ARC keeps track of strong references to those instances and increases or decreases their reference count correspondingly. It frees up memory consumed by objects with a reference count of zero. Because value types are copied when assigned, ARC does not raise or decrease its reference count. If you don't declare differently, all references will be strong references by default.
