Objective-C的Public, Protected, Private变量和方法的使用

.h文

#import <Foundation/Foundation.h>  

@interface Grammar : NSObject
{
　　/* 变量缺省的作用域是Protected */   
　　NSString* protectedVariable1;   

　　@public  
　　NSString* publicVariable1;  

　　@protected  
　　NSString* protectedVariable2;  

　　@private  
　　NSString* privateVariable;  
}  

/* 定义静态变量，所有的对象共享它 */   
NSString* staticVariable;  

@property (nonatomic, retain) NSString* publicVariable2;  

+ (void)staticMethod;  
- (void)publicMethod;  

@end   

 

.m文件

#import "Grammar.h"  

//私有方法以category方式实现  
#pragma mark -  
#pragma mark Grammar(private)  

@interface Grammar(private)  

- (void)privateMethod;  

@end  

#pragma mark -  
#pragma mark Grammar  

@implementation Grammar
{
　　/* private权限实例变量定义于此 */
}
  

@synthesize publicVariable2;  

#pragma mark -  
#pragma mark Public Method  

+ (void)staticMethod  
{  
}  

- (void)publicMethod  
{  
　　/* 局部静态变量，记录所有对象调用publicMethod方法的数据 */
　　static int pageCount = 0; pageCount ++;
}  

#pragma mark -  
#pragma mark Private Method  

- (void)privateMethod  
{  
}  

@end