AFHTTPSessionManager文件下载

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////  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
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