objective-C protocol协议

//
//  main.m

#import <Foundation/Foundation.h>

#import "Student.h"

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        // insert code here...
        NSLog(@"Hello, World!");
        Student *stu=[[Student alloc]init];
        [stu finishTeask];
        [stu dontlate];
        [stu wearNeat];//可选
   
    }
    return 0;
}

//
//  Scsy.h

#import <Foundation/Foundation.h>
//@protocol Scsy协议<父类>
@protocol Scsy <NSObject>
@required//必须实现
//声明
//完成作业
-(void)finishTeask;
//不迟到
-(void)dontlate;
@optional//可选
//衣着整洁
-(void)wearNeat;

//
//  Student.h

#import <Foundation/Foundation.h>
#import "Scsy.h"    
@interface Student : NSObject<Scsy>

@end

//
//  Student.m

#import "Student.h"

@implementation Student
-(void)finishTeask{
    NSLog(@"完成作业");
}
-(void)dontlate{
    NSLog(@"不能迟到");
    
}
-(void)wearNeat{
    NSLog(@"衣着整洁");
}
@end