iOS AFN下載

#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進行下載

   
   
}
- (IBAction)ButtonTapa:(UIButton *)sender {
    //指定數據下載到那個文件當中
    NSString *cachePath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask,YES)firstObject];
    //聲明文件的路徑
    NSString *moviePath = [cachePath stringByAppendingPathComponent:@"mo.mp4"];
   
    //判斷moviePath路徑下到底有沒有文件
    if ([[NSFileManagerdefaultManager]fileExistsAtPath:moviePath]) {
        //調用視頻播放器播放本地視頻
        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進行下載
    //創建操作對象//http://live.dl.ltimg.net/livezip/download/5540385469401b10912f7a24?type=mp4
    // -1就是不設置超時時間, 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];
    // 第一個參數  下載文件的路徑
    // 二          是否接着寫入文件, 用來做斷點下載
    operation.outputStream = [[NSOutputStream alloc]initToFileAtPath:moviePath append:NO];
   
    //這個方法就是下載的過程, 用來做進度條
    //第一個參數  本次下載了多少數據
    // 二        一共下載了多少數據
    // 三        這個文件或者視頻, 音頻一共有多大
    [operation setDownloadProgressBlock:^(NSUInteger bytesRead,long long totalBytesRead, long long totalBytesExpectedToRead) {
        //進度條顯示進度
        self.progress.progress = (float)totalBytesRead/totalBytesExpectedToRead;
       
    }];
   
    //下載完成後的方法
    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
       
        //調用視頻播放器播放本地視頻
        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,下載失敗");
    }];
    //打開這個任務
    [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