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• 1. 首先先引入幾個(gè)ASI必須的框架

圖1

• 2.引入頭文件

#import "ASIHTTPRequest.h" //ASI網(wǎng)絡(luò)請(qǐng)求
#import "ASINetworkQueue.h"http://ASI隊(duì)列

• 3屬性

@interface ViewController ()<ASIProgressDelegate>//此處代理為ProgressView(進(jìn)度條簽定)
@property (nonatomic, retain)ASIHTTPRequest *request;
@property (nonatomic, retain)ASINetworkQueue *netWorkQueue;
@property (nonatomic, retain)UIProgressView *progerssView;
@property (nonatomic, retain)UILabel *label;
@property (nonatomic, assign) BOOL select;

• 4創(chuàng)建一個(gè)hanldData

  NSString *urlstring = @"http://hc25.aipai.com/user/656/20448656/6167672/card/25033081/card.mp4";
    //初始化Documents路徑
    NSString *path = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
    
    //初始化臨時(shí)文件路徑
    NSString *folderPath = [path stringByAppendingPathComponent:@"temp"];
    //創(chuàng)建文件管理器
    NSFileManager *fileManager = [NSFileManager defaultManager];
    //判斷temp文件夾是否存在
    BOOL fileExists = [fileManager fileExistsAtPath:folderPath];
    
    if (!fileExists) {//如果不存在說(shuō)創(chuàng)建,因?yàn)橄螺d時(shí),不會(huì)自動(dòng)創(chuàng)建文件夾
        [fileManager createDirectoryAtPath:folderPath withIntermediateDirectories:YES attributes:nil error:nil];
    }
    
    //設(shè)置下載路徑
    self.request = [[ASIHTTPRequest alloc] initWithURL:[NSURL URLWithString:urlstring]];
    //設(shè)置ASIHTTPRequest代理
   self.request.delegate = self;
    // 設(shè)置文件路徑下文件夾的名字
    NSString *fileName = [urlstring lastPathComponent];
    //初始化保存ZIP文件路徑
    NSString *Savepath = [path stringByAppendingPathComponent:fileName];
    //初始化臨時(shí)文件路徑
    NSString *tempPath = [path stringByAppendingPathComponent:@"linshi"];
    //設(shè)置文件保存路徑
    [self.request setDownloadDestinationPath:Savepath];
    //設(shè)置臨時(shí)文件路徑
    [self.request setTemporaryFileDownloadPath:tempPath];
    //設(shè)置進(jìn)度條的代理,
    [_request setDownloadProgressDelegate:self.progerssView];
   // self.request.downloadProgressDelegate = self.progerssView;
    //[self.request setShowAccurateProgress:YES];
    //設(shè)置是是否支持?jǐn)帱c(diǎn)下載
    [self.request setAllowResumeForFileDownloads:YES];
    
    //添加到ASINetworkQueue隊(duì)列去下載
    [self.netWorkQueue go];
    [self.netWorkQueue addOperation:self.request];
    [self.request setCompletionBlock:^{
        NSLog(@"下載成功,文件保存到: %@",NSHomeDirectory());
    }];
    [self.request setFailedBlock:^{
        NSLog(@"下載失敗");
    }];

• 5.創(chuàng)建Button

- (void)creaeButton {
    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [button addTarget:self action:@selector(downloade:) forControlEvents:UIControlEventTouchUpInside];
    button.frame = CGRectMake(100, 180, 80, 30);
    [button setTitle:@"下載" forState:UIControlStateNormal];
    [self.view addSubview:button];   
}

• 6.實(shí)現(xiàn)Button點(diǎn)擊的方法

- (void)downloade:(UIButton *)sender {
    if ((sender.selected =! sender.selected)) {

        [sender setTitle:@"暫停" forState:UIControlStateNormal];
        [self handleData];

    } else {
        [sender setTitle:@"下載" forState:UIControlStateNormal];
                for (ASIHTTPRequest *request in [self.netWorkQueue operations]) {
                    //暫停的
            [request clearDelegatesAndCancel];
        }
    }
}

• 7.進(jìn)度條ProgressView的創(chuàng)建

- (void)createProgerssView {
    self.progerssView = [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleDefault];
    self.progerssView.frame = CGRectMake(50, 100, 200, 20);
    [self.view addSubview:self.progerssView];
    [_progerssView release];
    // 通過(guò)KVO監(jiān)聽 progress值,達(dá)到監(jiān)聽進(jìn)圖條的目的
    [self.progerssView addObserver:self forKeyPath:@"progress" options:NSKeyValueObservingOptionNew context:nil];
    }

• 8.kvo監(jiān)聽進(jìn)度條

- (void)observeValueForKeyPath:(NSString *)keyPath
                      ofObject:(id)object change:(NSDictionary<NSString *,id> *)change
                       context:(void *)context {
    
    NSNumber *value = [change objectForKey:@"new"];
    float progress = [value floatValue];
    NSLog(@"%.1f%%",progress *100);
    NSString *pro = [NSString stringWithFormat:@"%.1f%%",progress *100];
    self.label.text = pro;
    
    
}

• 9.這是我們?cè)赩iewDidLoad方法中進(jìn)行調(diào)用

- (void)viewDidLoad {
    [super viewDidLoad];
    //ASINetworkQueue是NSOperationQueue子類批旺，
    //iPhone 提供了 NSOperation 接口進(jìn)行任務(wù)對(duì)象的封裝影涉，而通過(guò)將任務(wù)對(duì)象加入到 NSOperationQueue 隊(duì)列.
    //NSOperationQueue 隊(duì)列會(huì)分配線程進(jìn)行任務(wù)對(duì)象的執(zhí)行.
    self.netWorkQueue  = [ASINetworkQueue queue];
    [self.netWorkQueue reset];
    [self.netWorkQueue setShowAccurateProgress:YES];
    // 設(shè)置請(qǐng)求的并發(fā)數(shù)
   // self.netWorkQueue maxConcurrentOperationCount =
    [self createProgerssView];
    [self creatLabel];
    [self creaeButton];
    // Do any additional setup after loading the view, typically from a nib.
}