[Objective C] Property Study Notes

1. The @ public, @ private, and @ protected defined in the class only affect the access permission of the class that inherits it.

2. @ property automatically adds the getter/setter Method to the variable.

3. getter method:

1 -(id) name
2 {
3     return name;
4 }

4. setter method:

1-(void) setname :( ID) _ name
2 {
3 if (name! = _ Name)
4 {
5 [Name Release];
6 name = [_ name copy]; // when the copy parameter is set
7}
8}

5. @ property's copy, retain, and assign Parameters

Affected setter functions:

Copy: name = [_ name copy]; // nsstring recommended

Retain: Name = [_ name retain]; // other object types are recommended.

Assign: Name = _ name; // delegate, basic data type (INT) is recommended

6. @ readonly parameter of property

Generate only getter Functions

7. @ property's atomic, nonatomic Parameter

Atomic ensures the thread security of getter and setter to a certain extent, but it cannot be completely dependent.

Nonatomic does not guarantee thread security and speed. Nonatomic is used in most cases.

8. @ property default parameters:

Atomic, assign, readwrite