//
// 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

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iOS-网络数据请求-异步图片下载

import "ViewController.h"