asphttprequest 实现文件下载, 监听下载进度以及当前网络的状态(WXHL)

 

#import "AppDelegate.h"

#import "ASIHTTPRequest.h"

#import "Reachability.h"

@implementation AppDelegate

- (void)dealloc

{

    [_window release];

    [super dealloc];

}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];

    self.window.backgroundColor = [UIColor whiteColor];

    [self.window makeKeyAndVisible];

   

    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];

    [button addTarget:self action:@selector(downloadAction) forControlEvents:UIControlEventTouchUpInside];

    button.frame = CGRectMake(150, 30, 80, 30);

    [button setTitle:@"下载" forState:UIControlStateNormal];

    [self.window addSubview:button];

   

   

    //kReachabilityChangedNotification 网络状态改变时触发的通知

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(changeNetwork:) name:kReachabilityChangedNotification object:nil];

   

    self.reachability = [Reachability reachabilityForInternetConnection];

    //开始监听网络

    [self.reachability startNotifier];

   

    NetworkStatus status = self.reachability.currentReachabilityStatus;

    [self checkNetWork:status];

   

    return YES;

}

- (void)downloadAction {

    //---------------------ASI下载--------------------

    UIProgressView *progressView = [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleBar];

    progressView.frame = CGRectMake(50, 100, 200, 20);

    [self.window addSubview:progressView];

   

    //通过kvo监听progress值，达到监听进度的目的

    [progressView addObserver:self forKeyPath:@"progress" options:NSKeyValueObservingOptionNew context:nil];

   

   

    NSString *urlstring = @"http://free2.macx.cn:81/tools/system/CleanMyMac-v1-10-8.dmg";

    NSString *documents = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];

    NSString *fileName = [urlstring lastPathComponent];

    NSString *path = [documents stringByAppendingPathComponent:fileName];

   

    ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:urlstring]];

    [request setHeadersReceivedBlock:^(NSDictionary *responseHeaders){

        //响应头

//        NSDictionary *responseHeaders = request.responseHeaders;

        NSLog(@"%@",responseHeaders);

       

        //获取下载文件大小

        NSNumber *contentSize = [responseHeaders objectForKey:@"Content-Length"];

    }];

   

    //设置文件下载存放的路径

    [request setDownloadDestinationPath:path];

    //设置进度条

    request.downloadProgressDelegate = progressView;

   

    //------------------------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];

}

- (void)observeValueForKeyPath:(NSString *)keyPath

                      ofObject:(id)object

                        change:(NSDictionary *)change context:(void *)context {

//    NSLog(@"%@",change);

    NSNumber *value = [change objectForKey:@"new"];

    float progress = [value floatValue];

    NSLog(@"%.1f%%",progress*100);

}

//网络状态改变的时候调用

- (void)changeNetwork:(NSNotification *)notification {

    NetworkStatus status = self.reachability.currentReachabilityStatus;

    [self checkNetWork:status];

}

- (void)checkNetWork:(NetworkStatus)status {

    if (status == kNotReachable) {

        NSLog(@"没有网络");

    }

    else if(status == kReachableViaWWAN) {

        NSLog(@"3G/2G");

    }

    else if(status == kReachableViaWiFi) {

        NSLog(@"WIFI");

    }

}

@end