The document discusses Automatic Reference Counting (ARC) in Swift. It provides examples of how ARC manages memory by counting references to objects using strong, weak, and unowned references. When an object's reference count reaches zero, ARC deallocates the object from memory. The document compares ARC to manual reference counting and provides additional resources on the topic.

1. ARC

2. . .
Hello, I am Dominic

3. Automatic Reference Counting
:
Reference Counting !
ARC ?

4. MRC ARC

5. ARC
!

6. • ,
.

7. •
.

8. • ,
.

9. • .
• deinit
.

10. var reference1
var reference2
var reference3
strong
strong
strong
“John Appleseed”
Person ?
reference1 = Person(name: "John Appleseed") 1
reference2 = reference1 2
reference3 = reference1 3
reference1 = nil 2
reference2 = nil 1
reference3 = nil 0
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11. var reference1
var reference2
var reference3
strong
strong
strong
“John Appleseed”
Person ?
reference1 = Person(name: "John Appleseed") 1
1
1
reference1 = nil 0
reference2 = nil 0
reference3 = nil 0
110
reference2 = Person(name: "john Appleseed")
reference3 = Person(name: "john Appleseed")
10 0

12. var reference1
var reference2
var reference3
strong
strong
“John Appleseed”
Person ?
reference1 = Person(name: "John Appleseed") 1
2
1
1
2
reference3 = nil 2
1
reference2 = reference1
reference1 = nil
reference3 = reference1
reference4 = reference2
var reference4
strong
212

13. ?

14. .

16. ?

17. •

18. ?
• weak

19. • .
.
• .
!

21. •

22. ?
• unowned

23. •
nil
•
->
!

25. ARC !
.
.

26. •
• iOS OS X - OSXDEV
• Objective-C SWIFT -
•
• [Swift] Automatic Reference Counting -
- https://medium.com/@jang.wangsu/ios-swift-rc-arc- -mrc- - -strong-weak-
unowned- - - -988a293c04ac
- https://academy.realm.io/kr/posts/letswift-swift-performance/
- https://twitter.com/twostraws/status/1136130799600668672?s=21
- https://namu.wiki/w/%EA%B8%B0%EC%96%B5%EC%9E%A5%EC%B9%98

27. .