The meaning and misunderstanding of @property @synthesize

The role of @property is to define properties and declare Getter,setter methods. ( Note: property is not a variable )

The role of @synthesize is to implement attributes, such as the Getter,setter method.

In the case of declaring a property, if you override the Setter,getter method, you need to define the unrecognized variable in @synthesize and use the accessor method of the property for the variable. Such as:

The. h file

@property (nonatomic,assign) Nsinteger age;

@property (nonatomic,retain) nsstring * name;

@property (nonatomic,copy) nsstring * BB;

In the. m file

If you do not add the following three lines, the report will not find the _AGE,_NAME,_BB variable error

@synthesize age = _age;

@synthesize name = _name;

@synthesize BB =_bb;

-(void) SetName: (NSString *) name{

if (_name!=name)

{[_name release];

_name = [name retain];

}

}

-(NSString *) name{

return [[_name retain] autorelease];

}

-(void) Setage: (Nsinteger) age{

_age = age;

}

-(Nsinteger) age{

return _age;

}

-(void) SETBB: (NSString *) bb{

if (_BB!=BB) {

[_BB release];

_BB = [BB copy];

}

}

-(NSString *) bb{

return [[_bb retain]autorelease];

}

Summary: Be sure to distinguish between attributes and variables, not confused. @synthesize the declared property = variable. This means that the Setter,getter method of the property acts on this variable.

The meaning and misunderstanding of @property @synthesize