#import <Foundation/Foundation.h>

@protocol SampleProtocol;

//声明核心类的属性和方法

@interface CoreManage : NSObject

@property(nonatomic,assign) id<SampleProtocol> delegate;

- (void)doMainWork;

@end

//声明协议中的接口函数

@protocol  SampleProtocol <NSObject>

@required

- (void)innerTaskCallBack:(int) innerTaskSerialNo;

@optional

- (void)resultDisplayCallBack:(NSString *)backInfo;

@end

#import "CoreManage.h"

@implementation CoreManage

@synthesize delegate=_delegate;

- (void)doMainWork

{

    NSLog(@"核心类完成工序0");

    NSLog(@"核心类完成工序1");

    [self.delegate innerTaskCallBack:2];//工序2通过外部类回调函数完成

    NSLog(@"核心类完成工序3");

    [self.delegate resultDisplayCallBack:@"成功"];//通过外部类回调函数显示任务完成结果

}

@end

#import <Foundation/Foundation.h>

#import "CoreManage.h"

@interface OuterClass : NSObject<SampleProtocol>

- (void)run;

@end

#import "OuterClass.h"

@implementation OuterClass

- (void)run

{

    CoreManage *coreManage=[[CoreManage alloc] init];

    coreManage.delegate=self;

    [coreManage doMainWork];

}

//回调函数1

- (void)innerTaskCallBack:(int) innerTaskSerialNo{

    NSLog(@"外部类的回调函数，完成工序%d",innerTaskSerialNo);

}

//回调函数2

- (void)resultDisplayCallBack:(NSString *)backInfo{

    NSLog(@"外部类的回调函数，输出完成结果：%@",backInfo);

}

@end