Block 回调函数

/

//  Dog.h

//  BlockDemo

//

//  Created by rrpin on 14-10-21.

//  Copyright (c) 2014年 lengshengren. All rights reserved.

//

#import <Foundation/Foundation.h>

 /*

    void 返回类型

    DogNameBlock 块的对象

    dogName 返回参数

 */

typedef void(^DogNameBlock)(NSString *dogName);

@interface Dog : NSObject

//能进行回调的方法

-(void)dogfirstName:(NSString *)firstName lastName:(DogNameBlock)block;

@end

//

//  Dog.m

//  BlockDemo

//

//  Created by rrpin on 14-10-21.

//  Copyright (c) 2014年 lengshengren. All rights reserved.

//

#import "Dog.h"

@implementation Dog

-(void)dogfirstName:(NSString *)firstName lastName:(DogNameBlock)block

{

    NSString *name = [NSStringstringWithFormat:@"%@%@",firstName,@"黄"];

    block(name);

}

    

@end

//

//  ViewController.m

//  BlockDemo

//

//  Created by rrpin on 14-10-21.

//  Copyright (c) 2014年 lengshengren. All rights reserved.

//

#import "ViewController.h"

@interfaceViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    [superviewDidLoad];

    

    Dog *dogBlock = [[Dogalloc]init];

    [dogBlock dogfirstName:@"大"lastName:^(NSString *name){

        NSLog(@"dog name is==%@",name);

    }];

   

}

- (void)didReceiveMemoryWarning {

    [superdidReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end