OC第三方框架-ASI使用方法

from：http://blog.csdn.net/iphone13/article/details/9674819

#import "ViewController.h"
#import "ASIHTTPRequest.h"
#import "SSZipArchive.h"
@interface ViewController ()
{
    CGFloat _fileLength;
}
@end

@implementation ViewController

- (void)viewDidLoad
{
    [superviewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [superdidReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
#pragma mark - ASI框架断点续传下载文件
- (IBAction)downloadFile {
    //指定下载地址
    NSString *urlstring = [NSStringstringWithFormat:@"http://teacher.local/~apple/xxx/download/iTunesConnect_DeveloperGuide_CN.zip"];
    NSURL *url = [NSURLURLWithString:urlstring];

    //设定文件保存路径及临时缓存路径
    NSArray *documents =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
    NSString *downloadPath = [documents[0]stringByAppendingPathComponent:@"book.zip"];
    NSString *tempPath = [documents[0]stringByAppendingPathComponent:@"book.tmp"];

    //创建ASIHTTPRequest
    ASIHTTPRequest *request = [[[ASIHTTPRequestalloc]initWithURL:url]autorelease];

    //设置代理,ASI是通过代理回调的方式处理网络请求的
    [request setDelegate:self];

    //设置下载路径
    [request setDownloadDestinationPath:downloadPath];

    //设置缓存路径
    [request setTemporaryFileDownloadPath:tempPath];

    //设置允许断点续传
    [request setAllowResumeForFileDownloads:YES];

    //设置下载进程代理，实现显示下载进度情况
    [request setDownloadProgressDelegate:self];

    //启动异步请求
    [request start];
}
//去.h文件中遵守协议
#pragma mark - ASI的代理方法
//请求开始
- (void)requestStarted:(ASIHTTPRequest *)request
{
    NSLog(@"请求开始");
}

//接收到响应头
- (void)request:(ASIHTTPRequest *)request didReceiveResponseHeaders:(NSDictionary *)responseHeaders
{
    //通过NSLog看到文件大小的key是“Content-length”
    NSLog(@"请求头%@", responseHeaders);
}
//请求完成
- (void)requestFinished:(ASIHTTPRequest *)request
{
    NSLog(@"请求完成");

    //在这个方法里做解压缩工作
    //定义一个压缩文件
    NSArray *documents =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
    NSString *downloadPath = [documents[0]stringByAppendingPathComponent:@"book.zip"];

    //定义一个目标解压目录
    //这里是documents[0]这个目录

    //调用类方法解压缩
    [SSZipArchive unzipFileAtPath:downloadPathtoDestination:documents[0]];

    //删除压缩文件
    [[NSFileManagerdefaultManager]removeItemAtPath:downloadPatherror:nil];
}

//请求失败
- (void)requestFailed:(ASIHTTPRequest *)request
{
    NSLog(@"请求失败");
}

#pragma mark - 下载进程代理方法
- (void)setProgress:(float)newProgress
{
    NSLog(@"%.2f", newProgress *_fileLength);
}
@end