Deallocates the memory occupied by the receiver.
- iOS 2.0+
- macOS 10.0+
- UIKit for Mac 13.0+Beta
- tvOS 9.0+
- watchOS 2.0+
- Objective-C Runtime
Subsequent messages to the receiver may generate an error indicating that a message was sent to a deallocated object (provided the deallocated memory hasn’t been reused yet).
You override this method to dispose of resources other than the object’s instance variables, for example:
In an implementation of
dealloc, do not invoke the superclass’s implementation. You should try to avoid managing the lifetime of limited resources such as file descriptors using
You never send a
dealloc message directly. Instead, an object’s
dealloc method is invoked by the runtime. See Advanced Memory Management Programming Guide for more details.
When not using ARC, your implementation of
dealloc must invoke the superclass’s implementation as its last instruction.