oc-@property parameters in memory management

1. Declaration of production get and set methods

2. Generate a simple implementation of get and set methods

/*-(void) Setcar: (Car *) car{

_car = car;

}

-(Car *) car{

return _car;

}

*/

3. If you do not have a member variable of the Fame object, then he will automatically generate a member variable at the beginning of _

@property parameters are divided into 4 categories

/*

1. Parameters related to the Set method memory management

Retain: To generate a set method (Application and object type) that conforms to the memory management principle (only the old value is retain in the setter, the new value is added)

-(void) Setcar: (Car *) car{

if (_car! = car) {

[_car release];//release old value

_car = [Car retain];//retain new value

}

Assign: Direct assignment, (object type, base data type)

Copy: (explained later)

*/

2. Multithreading-related

Nonatomic: Do not generate multithreaded related code, use this can be (more efficient)

Atomic: Generate multithreaded Correlation code (this is not written by default)

In the actual development, as long as the object type of the @property are written below

3. Do you want to generate the set and get methods

ReadWrite: Readable writable property, simultaneous generation of set and get methods

ReadOnly: Read-only property, generating only get methods

4.set parameters associated with the Get method name

Setter: Sets the generated Set method name

Getter: Set the generated Get method name

@property (nonatomic,retain) car * car;

@property (nonatomic,retain) nsstring * name;

@property (nonatomic,assign) int age; int float Double Char

@property (nonatomic,assign) int weight;

@property (nonatomic,assign,readonly) int idcard;

@property (nonatomic,assign,setter = Abc:,getter = zhuanghuimei) int height;

/**

[P abc:100];

int b = [P Zhuanghuimei];

P.height = 100;//[p Abc:10];

NSLog (@ "He%d", p.height);//[p Zhuanghuimei];

P 0

*/

Changing set and get method names is a lot of variables that are used in type bool

@property (nonatomic,assign,setter = Isdeid:,getter = Isdeid) BOOL Isdeid;

Because the one that's automatically generated above is

-(void) Setisdeid: (bool) Isdeid; But previously it was said that the BOOL type is the beginning of is, so this method is used to set the is beginning, as follows:

-(void) Isdeid: (BOOL) Isdeid;

oc-@property parameters in memory management