iPhone 开发教程(斯坦福大学)

@interface Person : NSObject

{

    NSString *name;

    int age;

}

- (NSString *)name; //get method

- (void)setName:(NSString *)value;

- (int) age; //get method;

- (void)setAge:(int)age;

- (BOOL)canLegallyVote;

//another way to creat property

//property declarations

@property int age;

@property (copy) NSString *name;

@property (readonly) BOOL canLegallyVote;

- (void)castBallot;

@end

// implementation file

@implementation Person;

- (int) age {return age;}

- (void)setAge:(int) value

{

    age=value; 

}

- (NSString *) name {return name;}

- (void)setName:(NSString *) value

{

    name=value;

}

//calling method

- (BOOL)canLegallyVote {

     return (self age>=18);

}

//antoher way to write it

@synthesize age;

@synthesize name;

- (BOOL)canLegallyVote{

    return(age >18);

} 

- (void)castBallot {

   if([self canLegallyVote]){

     //do voting stuff

}else {

    NSLog(@"I'm not allowed to vote yet!");

}

}

}   

@end

// Autoreleasing example

- (NSString *)fullName{

      NSString *result;

      result=[[NSString alloc] initWithFormat:"%@ %@" , firstName, lastName];

      [result autorelease]; 

      return result;

}