OBJECTIVE-C Series-@Property & Point syntax

explains the meaning of the modifier in parentheses behind the property :

Nonatomic Non-thread-safe non-atomic operation is characterized by high efficiency of operating variables

Atomic Thread -safe atomic Operation is characterized by low efficiency of operating variables

//

The retain strong reference instance variable , that is, The setter method will have:

-(void) setxxx: (XXX) arg

//                                  {

[_ Property name release];

_ Property name = [arg retain];

//                                  }

and the class needs to override the Dealloc method

All other class objects that are not OC strings are used retain

//

Copy copy, that is, The setter method will have :

-(void) setxxx: (XXX) arg

//                                  {

[_ Property name release];

_ Property name = [arg copy];

//                                  }

and the class needs to override the Dealloc method

the object used by copy is : OC string, block

//

Assign direct assignment, that is, The setter method will be :

-(void) setxxx: (XXX) arg

//                                  {

_ Property name = arg;

//                                  }

data types that apply to all non-objects : int float, char, struct

Union, Void *, SEL, CLASS BOOL enumeration

ReadOnly does not provide setter methods , limit instance variables cannot be externally modified

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Dot syntax

@class person;

Person *person = [[Person alloc] init];

Person.name = @ "Haiyan";//Setter method

NSString *love = person.name; Getter method

End

OBJECTIVE-C series [email protected]& DOT Syntax