OC 对象作为方法的参数连续传递

实现1：

#import <Foundation/Foundation.h>
@interface Gun:NSObject{
    @public
    NSString *_type;
    int _bllutCount;
}
-(void)shot;
@end
@implementation Gun
-(void)shot{
    if(_bllutCount >0){
        _bllutCount--;
    }

    NSLog(@"%@ is shoting ..., the bllut is leave :%d",_type,_bllutCount);
}


@end

@interface Person : NSObject{
    @public
    NSString *_name;
    int _life;
    int _level;
}
-(void)fire:(Gun *) gun;

@end

@implementation Person
-(void)fire:(Gun *) gun{
    [gun shot];
}


@end

int main(int argc, const char * argv[])
{

    @autoreleasepool {

        //
        Person *p = [Person new];
        p->_name = @"tom";
        p->_life = 100;
        p->_level = 10;

        Gun *gun = [Gun new];
        gun ->_type = @"china";
        gun ->_bllutCount = 6;

        [p fire:gun];
        [p fire:gun];
        [p fire:gun];

        NSLog(@"Hello, World!");

    }
    return 0;
}

实现2：