AFHTTPSessionManager文件下载

//
//  ViewController.m
//  AFNetWorking
//
//  Created by hq on 16/4/18.
//  Copyright © 2016年 hanqing. All rights reserved.
//

#import "ViewController.h"
#import <AFNetworking.h>

@interface ViewController ()

- (IBAction)start:(UIButton *)sender;

- (IBAction)pause:(UIButton *)sender;

@property (weak, nonatomic) IBOutlet UIProgressView *pro;

@property(nonatomic,strong) NSURLSessionDownloadTask *task;

@end

@implementation ViewController

-(NSURLSessionDownloadTask *)task{
    
    if (!_task) {
        
        AFHTTPSessionManager *session=[AFHTTPSessionManager manager];
        
        NSURLRequest *request=[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://120.25.226.186:32812/resources/videos/minion_01.mp4"]];
        
        _task=[session downloadTaskWithRequest:request progress:^(NSProgress * _Nonnull downloadProgress) {
            
            //下载进度
            NSLog(@"%@",downloadProgress);
            
            [[NSOperationQueue mainQueue] addOperationWithBlock:^{
                
                self.pro.progress=downloadProgress.fractionCompleted;
                
            }];
            
        } destination:^NSURL * _Nonnull(NSURL * _Nonnull targetPath, NSURLResponse * _Nonnull response) {
            
            //下载到哪个文件夹
            NSString *cachePath=NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES).firstObject;
            
            NSString *fileName=[cachePath stringByAppendingPathComponent:response.suggestedFilename];
            
            return [NSURL fileURLWithPath:fileName];
            
        } completionHandler:^(NSURLResponse * _Nonnull response, NSURL * _Nullable filePath, NSError * _Nullable error) {
            
            //下载完成了
            NSLog(@"下载完成了 %@",filePath);
        }];
    }
    
    return _task;
}

- (void)viewDidLoad {
    [super viewDidLoad];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    
}

- (IBAction)start:(UIButton *)sender {
    
    [self.task resume];
}

- (IBAction)pause:(UIButton *)sender {
    
    [self.task suspend];
}
@end