//block 和delegate的用法 设置代理

#import <UIKit/UIKit.h>

typedef void (^ASIHeadersBlock)(NSString *myString);

@protocol AHViewControllerDelegate <NSObject>

- (void)smyheadersReceivedBlock:(NSString *)string;

@end

@interface AHViewController : UIViewController

{

    ASIHeadersBlock headersReceivedBlock;

    NSObject <AHViewControllerDelegate> *delegate;

}

@property (nonatomic, assign) NSObject <AHViewControllerDelegate> * delegate;

- (void)setHeadersReceivedBlock:(ASIHeadersBlock)aReceivedBlock;

@end

---------------------------------------------------------------------

//

//  AHViewController.m

//  TestBlock

//

//  Created by ganvin on 13-4-12.

//  Copyright (c) 2013年 ganvin. All rights reserved.

//

#import "AHViewController.h"

@interface AHViewController ()

@end

@implementation AHViewController

@synthesize  delegate;

- (void)setHeadersReceivedBlock:(ASIHeadersBlock)aReceivedBlock

{

[headersReceivedBlock release];

headersReceivedBlock = [aReceivedBlock copy];

}

- (void)viewDidLoad

{

    [super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

if(headersReceivedBlock)

    {

     headersReceivedBlock(@"ssss");

  }

    if (delegate!= nil && [delegate respondsToSelector:@selector(smyheadersReceivedBlock:)])

    {

        [delegate performSelector:@selector(smyheadersReceivedBlock:) withObject:@"sssss"];

    }

}

- (void)didReceiveMemoryWarning

{

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

- (void)dealloc

{

    delegate = nil;

if (headersReceivedBlock)

    {

[headersReceivedBlock release];

headersReceivedBlock = nil;

}

    [super dealloc];

}

@end