思路分析:协议--代理者--主动者--主函数--基本上18分钟完成
1.协议:方法声明:喂婴儿吃饭,让婴儿睡觉
2.代理者:保姆-遵守协议-实现方法 - 主动者作为参数
3.婴儿类:>属性姓名,id<协议>-代理者   >方法声明:吃饭,睡觉  >方法实现:吃饭血量+20 睡觉血量+10---调用代理者
4.main函数创建对象,调用方法
#import <Foundation/Foundation.h>
// 1.协议:方法声明:喂婴儿吃饭,让婴儿睡觉
@class Baby;
@protocol EatFoodAndSleepProtocol <NSObject>
//喂婴儿吃饭
- (void)letBabyEatFood:(Baby *)baby;
//让婴儿睡觉
- (void)letBabySleep:(Baby *)baby;
@end
#import <Foundation/Foundation.h>
#import "EatFoodAndSleepProtocol.h"
#import "Baby.h"
//2.代理者:保姆-遵守协议-实现方法 - 主动者作为参数
@interface BaoMu : NSObject <EatFoodAndSleepProtocol>
//名字属性
@property(nonatomic,copy)NSString *name;
@end
#import "BaoMu.h"
//实现方法 - 主动者作为参数
@implementation BaoMu
//喂婴儿吃饭
- (void)letBabyEatFood:(Baby *)baby{
    baby.blood +=20;
    NSLog(@"%@吃饭了,血量变成了了%lf",baby.name,baby.blood);
}
//让婴儿睡觉
- (void)letBabySleep:(Baby *)baby{
    baby.blood +=10;
    NSLog(@"%@睡觉了,血量编程了%lf",baby.name,baby.blood);
}
@end
#import <Foundation/Foundation.h>
#import "EatFoodAndSleepProtocol.h"
@interface Baby : NSObject
//姓名属性
@property(nonatomic,copy)NSString *name;
//代理者属性
@property(nonatomic,strong)id<EatFoodAndSleepProtocol> delegate;
//血量属性
@property(nonatomic,assign)double blood;

//吃饭
- (void)eatFood;
//睡觉
-(void)sleep;
@end
#import "Baby.h"

@implementation Baby
//吃饭
- (void)eatFood{
    NSLog(@"哇哇哇.....");
    [self.delegate letBabyEatFood:self];
}
//睡觉
-(void)sleep{
    NSLog(@"吃饱了");
    [self.delegate letBabySleep:self];
}
@end
#import <Foundation/Foundation.h>
#import "BaoMu.h"
#import "BaoMu.h"
int main(int argc, const char * argv[]) {
    //婴儿对象和属性
    Baby *baby = [Baby new];
    baby.name = @"妞妞";
    baby.blood = 400;
   
    //保姆对象
    BaoMu *baoMu = [BaoMu new];
    baoMu.name = @"保姆";
   
    //代理者保姆
    baby.delegate = baoMu;
    //调用婴儿方法
    [baby eatFood];
    [baby sleep];
    return 0;
}

楼主写的不错