.h文件

#import <Foundation/Foundation.h>  

@interface Grammar : NSObject {  

NSString* protectedVariable1;   

   @public  

NSString* publicVariable1;  

    @protected  

        NSString* protectedVariable2;  

    @private  

        NSString* privateVariable;  

}  

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  

@synthesize publicVariable2;  

#pragma mark -  

#pragma mark Public Method  

+ (void)staticMethod  

{  

}  

- (void)publicMethod  

{  

}  

#pragma mark -  

#pragma mark Private Method  

- (void)privateMethod  

{  

}  

@end  

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