IOS 多线程下载实例（下载图片的例子---使用单独的线程类）

这两天一直研究多线程，网上找了个例子是多线程下载图片，自己将这个例子改成了单独的线程类，本来是向写成同时下载两张图片的，但是目前还未成功，先将下载一张图片的demo分享下，忘大家多多指点。本人QQ715425534-----------欢迎大家指点

//viewController.h/
//
// ThreadViewController.h
// Thread
//
// Created by y on 13-5-9.
// Copyright (c) 2013年 www.Zparkedu.com. All rights reserved.
//

#import <UIKit/UIKit.h>
#import "Thread.h"


@interface ThreadViewController :UIViewController<ControControllerDelegate>

@property (retain,nonatomic) Thread *thread;

@property (retain,nonatomic) IBOutletUIImageView *imageOne;

@property (retain,nonatomic) IBOutletUIImageView *imageTwo;

@property (retain,nonatomic) NSData *downloadData;

@property (retain,nonatomic) IBOutletUIActivityIndicatorView *activityIndicatorOne;

-(IBAction)downloadOne:(id)sender;

@end

/viewController.m/
//
// ThreadViewController.m
// Thread
//
// Created by y on 13-5-9.
// Copyright (c) 2013年 www.Zparkedu.com. All rights reserved.
//

#import "ThreadViewController.h"

@interface ThreadViewController ()

@end

@implementation ThreadViewController

@synthesize imageOne,imageTwo,downloadData,thread,activityIndicatorOne;

- (void)viewDidLoad
{
[superviewDidLoad];
self.title =@"多线程Demo";
thread = [[Threadalloc]init];
self.activityIndicatorOne.hidesWhenStopped =YES;
}

-(void)viewDidUnload
{
[thread release];
[superviewDidUnload];
}

-(IBAction)downloadOne:(id)sender
{
[activityIndicatorOnestartAnimating];
NSString *urlString =@"http://h.hiphotos.baidu.com/album/w%3D2048/sign=d54ead720824ab18e016e63701c2e7cd/8b82b9014a90f603f4a5d4133812b31bb051ed49.jpg";
[self.threadcreatSubThread:urlString];


self.thread.delegate =self;
}

#pragma mark - ControControllerDelegate
-(void)sendResponsedataTOController:(NSData *)responsedata
{
NSLog(@"ControllerREsponsedata:%@",responsedata);
if (responsedata != nil) {
[self.activityIndicatorOnestopAnimating];
self.downloadData = responsedata;
NSLog(@"downloadData:%@",downloadData);
self.imageOne.image = [UIImageimageWithData:downloadData];
}
}

- (void)didReceiveMemoryWarning
{
[superdidReceiveMemoryWarning];
}

- (void)dealloc {
[imageOne release];
[imageTwo release];
[UIActivityIndicatorViewrelease];
[superdealloc];
}
@end

/线程类Thread.h///
//
// Thread.h
// Thread
//
// Created by y on 13-5-9.
// Copyright (c) 2013年 www.Zparkedu.com. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "ASIHTTPRequest.h"
#import "ASINetworkQueue.h"

@protocol ControControllerDelegate;
@protocol ControControllerDelegate <NSObject>
@required
-(void)sendResponsedataTOController:(NSData*)responsedata;
@end

@interface Thread :NSObject

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

@property (retain,nonatomic) ASINetworkQueue *networkQueue;

//创建子线程
-(void)creatSubThread:(NSString*)urlString;
//子线程的方法
-(void)subThreadMethod:(NSURL*)url;


@end

/线程类Thread.m///

//
// Thread.m
// Thread
//
// Created by y on 13-5-9.
// Copyright (c) 2013年 www.Zparkedu.com. All rights reserved.
//

#import "Thread.h"

@implementation Thread

//创建子线程
-(void)creatSubThread:(NSString*)urlString
{
NSURL *url = [NSURLURLWithString:urlString];
[NSThread detachNewThreadSelector:@selector(subThreadMethod:)toTarget:selfwithObject:url];
}
//子线程的方法
-(void)subThreadMethod:(NSURL*)url
{
NSLog(@"url:%@",url);
//请求部分
ASIHTTPRequest *request = [ASIHTTPRequestrequestWithURL:url];
[request startSynchronous];
//请求失败时返回的错误信息
NSError *error = [request error];
NSLog(@"error:%@",error);
//若请求成功就存储数据
if (!error) {
NSData *responsedata = [request responseData];
NSLog(@"responsedata:%@",responsedata);
//判断是否遵循协议
if ([self.delegateconformsToProtocol:@protocol(ControControllerDelegate)])
{
NSLog(@"123responsedata:%@",responsedata);
[self.delegatesendResponsedataTOController:responsedata];
}
}
}
@end