////  ViewController.m//  AFN断点续传演练////  Created by apple on 13-7-30.//  Copyright (c) 2013年 Jackie. All rights reserved.//#import "ViewController.h"#import "AFNetworking.h"#import "SSZipArchive.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad{    [super viewDidLoad];	// Do any additional setup after loading the view, typically from a nib.}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}#pragma mark - 下载文件- (IBAction)downloadFiles:(id)sender{    // 1.   指定下载文件地址    NSURL *url = [NSURL URLWithString:@"http://169.254.98.245/~apple/itcast/download/iTunesConnect_DeveloperGuide_CN.zip"];    // 2.   指定文件保存路径    NSArray *documents = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);    NSString *downloadPath = [documents[0]stringByAppendingPathComponent:@"book.zip"];    // 3.   创建NSURLRequest    NSURLRequest *request = [NSURLRequest requestWithURL:url];    // 4.   创建AFURLConnectionOperation    AFURLConnectionOperation *operation = [[AFHTTPRequestOperation alloc]initWithRequest:request];        // 5.   设置操作的输出流（在网络中的数据是以流的方式传输的，告诉操作把文件保存在第2步设置的路径中）    [operation setOutputStream:[NSOutputStream outputStreamToFileAtPath:downloadPath append:NO]];    // 6.   设置下载进程处理块代码    // 6.1 bytesRead 读取的字节——这一次下载的字节数    // 6.2 totalBytesRead 读取的总字节——已经下载完的    // 6.3 totalBytesExpectedToRead 希望读取的总字节——就是文件的总大小    [operation setDownloadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead) {        // 做下载进度百分比的工作        NSLog(@"下载百分比：%f", (float)totalBytesRead / totalBytesExpectedToRead);    }];    // 7.   操作完成块代码    [operation setCompletionBlock:^{        // 解压缩的顺序        // 1. 定义要解压缩的文件 —— downloadPath        // 2. 要解压缩的目标目录        // 3. 调用类方法解压缩        [SSZipArchive unzipFileAtPath:downloadPath toDestination:documents[0]];                // 删除压缩包        [[NSFileManager defaultManager]removeItemAtPath:downloadPath error:nil];    }];        // 8   启动操作    [operation start];}@end