//
// ViewController.m
// 网络数据请求-视频下载播放
//
// Created by YIem on 16/3/1.
// Copyright © 2016年 YIem. All rights reserved.
//

import "ViewController.h"

// 系统播放器调用

import <AVFoundation/AVFoundation.h>

@interface ViewController ()<NSURLSessionDownloadDelegate>
// 视频
@property (nonatomic, retain) NSURLSessionDownloadTask *downTask;
// 下载进度条
@property (nonatomic, retain) UIProgressView *progressV;
@end

@implementation ViewController

• (void)dealloc
  {

  [_progressV release];
  [_downTask release];
  [super dealloc];

  }

• (void)viewDidLoad {

  [super viewDidLoad];
  // Do any additional setup after loading the view, typically from a nib.
  self.view.backgroundColor = [UIColor greenColor];
  
  UIButton *movieButton = [UIButton buttonWithType:UIButtonTypeSystem];
  movieButton.frame = CGRectMake(50, 50, 80, 30);
  [movieButton setTitle:@"下载小电影" forState:UIControlStateNormal];
  [movieButton addTarget:self action:@selector(movieAction) forControlEvents:UIControlEventTouchUpInside];
  [self.view addSubview:movieButton];
  // 下载进度条
  self.progressV = [[UIProgressView alloc] initWithFrame:CGRectMake(50, 100, self.view.frame.size.width - 100, 30)];
  [self.view addSubview:_progressV];
  [_progressV release];
  
  // 暂停下载
  UIButton *pauseButton = [UIButton buttonWithType:UIButtonTypeSystem];
  pauseButton.frame = CGRectMake(50, 150, 100, 30);
  [pauseButton setTitle:@"暂停下载" forState:UIControlStateNormal];
  [pauseButton addTarget:self action:@selector(pauseAction) forControlEvents:UIControlEventTouchUpInside];
  [self.view addSubview:pauseButton];
  // 继续下载
  UIButton *continueButton = [UIButton buttonWithType:UIButtonTypeSystem];
  continueButton.frame = CGRectMake(200, 150, 100, 30);
  [continueButton setTitle:@"继续下载" forState:UIControlStateNormal];
  [continueButton addTarget:self action:@selector(continueAction) forControlEvents:UIControlEventTouchUpInside];
  [self.view addSubview:continueButton];
  

}
// 暂停下载

• (void)pauseAction
  {

if (NSURLSessionTaskStateRunning == self.downTask.state) {
    [self.downTask suspend];
}

}
// 继续下载

• (void)continueAction
  {
  if (NSURLSessionTaskStateSuspended == self.downTask.state) {

  [self.downTask resume];

  }
  }

// 播放

• (void)playWithFilePath:(NSString *)filePath
  {

  NSURL *url = [NSURL fileURLWithPath:filePath];
  AVPlayer *player = [AVPlayer playerWithURL:url];
  // 用来显示视频
  AVPlayerLayer *playerLayer = [AVPlayerLayer playerLayerWithPlayer:player];
  playerLayer.frame = CGRectMake(50, 200, self.view.frame.size.width - 100, 300) ;
  
  // 添加显示
  [self.view.layer addSublayer:playerLayer];
  // 开始播放
  [player play];

  }

// 视频下载

• (void)URLSession:(NSURLSession )session downloadTask:(NSURLSessionDownloadTask )downloadTask didWriteData:(int64_t)bytesWritten totalBytesWritten:(int64_t)totalBytesWritten totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite
  {

  NSLog(@"下载过程中会多次调用, 每次下载不一定多大的数据");
  NSLog(@"本次下载大小: %.2fKB--已经下载大小: %.2fKB--总大小: %.2fKB", bytesWritten / 1024.0, totalBytesWritten / 1024.0,  totalBytesExpectedToWrite / 1024.0);
  self.progressV.progress = (CGFloat)totalBytesWritten / totalBytesExpectedToWrite;

  }

• (void)URLSession:(NSURLSession )session downloadTask:(NSURLSessionDownloadTask )downloadTask didFinishDownloadingToURL:(NSURL *)location
  {

  NSLog(@"下载结束后调用");
  // 获取本地对应位置的路径
  NSString *cach = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
  // 拼接文件的名字(系统默认)
  NSString *file = [cach stringByAppendingPathComponent:downloadTask.response.suggestedFilename];
  NSFileManager *fileMan = [NSFileManager defaultManager];
  // 将下载的数据右临时文件移到本地路径
  [fileMan moveItemAtPath:location.path toPath:file error:nil];
  // 调用视频处理方法播放视频
  [self playWithFilePath:file];

  }

• (void)movieAction
  {

  NSURL *url = [NSURL URLWithString:@"http://hc25.aipai.com/user/656/20448656/6167672/card/25033081/card.mp4?l=a"];
  NSURLRequest *requset = [NSURLRequest requestWithURL:url];
  // 参数1: 默认配置
  // 参数2: 代理人 //协议 <NSURLSessionDownloadDelegate>
  // 参数3: 再哪个线程内执行(当前选择主线程)
  NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[NSOperationQueue mainQueue]];
  // 创建下载任务
  self.downTask = [session downloadTaskWithRequest:requset];
  // 开始任务
  [self.downTask resume];

  }

• (void)didReceiveMemoryWarning {

  [super didReceiveMemoryWarning];
  // Dispose of any resources that can be recreated.

  }

@end