Basic memory management policy for iPhone Library

Basic memory management policy of the database

Apple provides developers with a large number of libraries, including the following memory management policies.

1. If the object is created using the-initialization method, the object only adds 1 to the reference count, that is, the retain operation is performed internally.

2. If the object uses the + initialization object (equivalent to the static method of java or C ++), the object not only adds 1 to the reference count, but also automatically performs the autorelease operation.

3. If you use the attribute declared by @ property (retain), The retain operation will be executed when the value is assigned for the first time.