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

import "ViewController.h"

@interface ViewController ()
// 图片
@property (nonatomic, retain) UIImageView *imageV;
@end

@implementation ViewController

• (void)dealloc
  {

  [_imageV release];
  [super dealloc];

  }

• (void)viewDidLoad {

  [super viewDidLoad];
  // Do any additional setup after loading the view, typically from a nib.
  self.view.backgroundColor = [UIColor cyanColor];
  UIButton *imageButton = [UIButton buttonWithType:UIButtonTypeSystem];
  imageButton.frame = CGRectMake(100, 100, 100, 100);
  [imageButton setTitle:@"下载图片" forState:UIControlStateNormal];
  [imageButton addTarget:self action:@selector(imageAction) forControlEvents:UIControlEventTouchUpInside];
  [self.view addSubview:imageButton];
  
  self.imageV = [[UIImageView alloc] initWithFrame:CGRectMake(100, 200, 300, 200)];
  _imageV.backgroundColor = [UIColor redColor];
  [self.view addSubview:_imageV];
  [_imageV release];

  }

• (void)imageAction
  {

  NSURL *url = [NSURL URLWithString:@"http://yiem.net/usr/uploads/2016/01/3648146106.jpg"];
  NSURLSession *session = [NSURLSession sharedSession];
  NSURLSessionDownloadTask *dowImageTask = [session downloadTaskWithURL:url completionHandler:^(NSURL * _Nullable location, NSURLResponse * _Nullable response, NSError * _Nullable error) {
      // 获取本地文件对应的路径
      NSString *cach = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)lastObject];
      // 拼接文件的名字(系统建议的名字)
      NSString *file = [cach stringByAppendingPathComponent:response.suggestedFilename];
      NSFileManager *fileM = [NSFileManager defaultManager];
      // 将下载的数据由临时文件移动到本地路径
      [fileM moveItemAtPath:location.path toPath:file error:nil];
      // 就图片铺建显示
      _imageV.image = [UIImage imageWithContentsOfFile:file];
  }];
  // 开始任务
  [dowImageTask resume];

  }

• (void)didReceiveMemoryWarning {

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

  }

@end