iOS AFN下载

#import "ViewController.h"
#import "AFNetworking.h"
#import 
@interface ViewController ()
@property (strong, nonatomic) IBOutlet UIView *progressView;
@property (weak, nonatomic) IBOutlet UIProgressView *progress;
@property (weak, nonatomic) IBOutlet UIButton *button;

@end

@implementation ViewController
- (IBAction)ButtonTap:(id)sender {
    //使用AFN进行下载

   
   
}
- (IBAction)ButtonTapa:(UIButton *)sender {
    //指定数据下载到那个文件当中
    NSString *cachePath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask,YES)firstObject];
    //声明文件的路径
    NSString *moviePath = [cachePath stringByAppendingPathComponent:@"mo.mp4"];
   
    //判断moviePath路径下到底有没有文件
    if ([[NSFileManagerdefaultManager]fileExistsAtPath:moviePath]) {
        //调用视频播放器播放本地视频
        MPMoviePlayerViewController  *moviePlayer = [[MPMoviePlayerViewController alloc] initWithContentURL:[NSURLfileURLWithPath:moviePath]];//NSURL fileURLWithPath:moviePath本地文件的地址
       moviePlayer.moviePlayer.scalingMode =MPMovieScalingModeAspectFit;
       moviePlayer.moviePlayer.controlStyle =MPMovieControlStyleEmbedded;
        moviePlayer.view.frame = CGRectMake(5, 70,self.view.frame.size.width-10, 200);
        [self presentMoviePlayerViewControllerAnimated:moviePlayer];
        return;
    }
    //使用AFN进行下载
    //创建操作对象//http://live.dl.ltimg.net/livezip/download/5540385469401b10912f7a24?type=mp4
    // -1就是不设置超时时间, 一般是30秒
    NSURL *url = [NSURLURLWithString:@"http://api.sina.cn/sinago/video_location.json?sf_i=4&video_id=138600506&fromsinago=1&postt=news_video_video_1&from="];
    NSURLRequest *urlRequest = [NSURLRequest requestWithURL:urlcachePolicy:NSURLRequestUseProtocolCachePolicytimeoutInterval:-1];
    AFHTTPRequestOperation *operation = [[AFHTTPRequestOperationalloc] initWithRequest:urlRequest];
    // 第一个参数  下载文件的路径
    // 二          是否接着写入文件, 用来做断点下载
    operation.outputStream = [[NSOutputStream alloc]initToFileAtPath:moviePath append:NO];
   
    //这个方法就是下载的过程, 用来做进度条
    //第一个参数  本次下载了多少数据
    // 二        一共下载了多少数据
    // 三        这个文件或者视频, 音频一共有多大
    [operation setDownloadProgressBlock:^(NSUInteger bytesRead,long long totalBytesRead, long long totalBytesExpectedToRead) {
        //进度条显示进度
        self.progress.progress = (float)totalBytesRead/totalBytesExpectedToRead;
       
    }];
   
    //下载完成后的方法
    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
       
        //调用视频播放器播放本地视频
        MPMoviePlayerViewController  *moviePlayer = [[MPMoviePlayerViewController alloc] initWithContentURL:[NSURLfileURLWithPath:moviePath]];//NSURL fileURLWithPath:moviePath本地文件的地址
        [self presentMoviePlayerViewControllerAnimated:moviePlayer];
       
       
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        NSLog(@"抱歉,下载失败");
    }];
    //打开这个任务
    [operation start];
  
   
}

- (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.
}

@end