//
//  Created by apple on 15-4-21.
//  Copyright (c) 2015年 itcast. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "Dog.h"
int main(int argc, const char * argv[]) {
    @autoreleasepool {
        
        Dog *heipi = [Dog new];
        
      
        heipi.tuiNum = 10;
        NSLog(@"tuiNum = %d",heipi.tuiNum);
   
   
    }
    return 0;
}



#import <Foundation/Foundation.h>

@interface Dog : NSObject
{
    int _tuiNum;
}
// 关键字  类型  方法名(变量名)

//@property int _tuiNum;
/*
-(void)set_tuiNum:(int) _tuiNum;
-(int)_tuiNum;

*/
@property int tuiNum;
@end
#import "Dog.h"

@implementation Dog
-(void)setTuiNum:(int)tuiNum{

    _tuiNum = tuiNum;

}

-(int)tuiNum{


    return _tuiNum;
}
@end

觉得要加相互引用的retain 以及strong的分类好些

支持一下！

哎哟不错噢