利用ASIHttp实现文件的下载、上传和网络状态的监控

第一、设置下载路径

    NSString *string=@"http://free2.macx.cn:81/tools/system/CleanMyMac-v1-10-8.dmg";
    NSString *document=[NSHomeDirectory()stringByAppendingString:@"document"];
    NSString *path=[documentstringByAppendingString:[stringlastPathComponent]];
    ASIHTTPRequest *request=[ASIHTTPRequestrequestWithURL:[NSURLURLWithString:string]];
    request.delegate=self;
第二、开始下载
    [request setDownloadDestinationPath:path];
//下载代理进度条，还有上传代理进度条
    request.downloadProgressDelegate=progressView;
    [request startAsynchronous];
 第三、利用block方法获取文件的大小
    [request setHeadersReceivedBlock:^(NSDictionary *responseHeaders){
        //响应头
        NSLog(@"the length is %@",[responseHeadersobjectForKey:@"Content-Length"]);
    }];
第四、获取下载进度

//通过kvo监听进度条
    [progressView
addObserver:selfforKeyPath:@"progress"options:NSKeyValueObservingOptionNewcontext:nil];

-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void
*)context
    {
        NSLog(@"%@",change);
        NSNumber *num=[changeobjectForKey:@"new"];
        
        float progress=[num
floatValue];
        NSLog(@"the len is %f %%",progress*100);
    }
第五、网络状态的监控

@property (nonatomic,retain)Reachability *reachAble;
//添加通知

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachStatusChanged:) name:kReachabilityChangedNotification object:nil];
    self.reachAble=[Reachability reachabilityForInternetConnection];
//当网络状态发生改变时调用此函数
-(void)reachStatusChanged:(NSNotification *)notification
{
    NetworkStatus status=self.reachAble.currentReachabilityStatus;
    [self checkNetWork:status];
}
//网络状态的三种表示
kNotReachable：表示没有网络

kReachableViaWWAN：表示2G/3G

kReachableViaWIFI:标示WIFI

    -(void)checkNetWork:(NetworkStatus) status
    {
        if (status==kNotReachable) {
            NSLog(@"没有网络");
        }else if (status==kReachableViaWWAN)
        {
            NSLog(@"2G/3G");
        } else{
            NSLog(@"WIFI");
        }
    }
第六、上传文件
NSString *a = @"http://www.****.php";
    NSURL *url = [NSURL URLWithString:a];
    ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];
    [request setDelegate:self];
    [request startAsynchronous];
    [request setFile:file forKey:@"photo"];

    //------------------------断点续传-----------------------
    //设置是否支持断点续传
    [request setAllowResumeForFileDownloads:YES];
    NSString *tempPath = [NSHomeDirectory()stringByAppendingPathComponent:@"tmp/cache.download"];
    //设置下载过程中暂存的文件路径
    [request setTemporaryFileDownloadPath:tempPath];
    [request startAsynchronous];