iOS网络编程————AFNetworking上传和下载

作为使用最广泛的网络第三方框架，AFNetworking2.0对最新的iOS特性有很好的支持，对NSURL进行了封装，使用更加简便，功能更加完善。

导入AFNetworking

1：Github下载地址：https://github.com/AFNetworking/AFNetworking

2：将AFNetworking和UIKit+AFNetworking拖入当前的工程中，iOS7之后对网络的访问要另加设置，不要忘记开启网络（info.plist中添加App Transport Security Settings，在其下添加Allow Arbitrary Loads并设置其value为YES）

另种方法：在终端利用cocoaPods来将AFNetworking配置到当前工程中

1：终端输入：pod search AFNetworking并拷贝

2：cd到当前工程目录

3：初始化cocoa环境：pod init  （会自动创建Podfile文件）

4：编辑Podfile文件：vim Podfile

5：在终端中输入i，表示插入内容到Podfile

6：在target ‘工程名’ do与end之间写入拷贝的AFNetworking库

7：输入完以后，按下Esc键退出编辑状态，然后输入：wq，保存并退出。

8：在Finder中打开工程目录，在.xcworkspace中进行下面的编辑任务即可。

使用AFNetworking实现基本的下载数据任务

#import "ViewController.h"
#import "AFNetworking.h"
#import "UIProgressView+AFNetworking.h"

@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIProgressView *progressView;
@property (weak, nonatomic) IBOutlet UILabel *progressLabel;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

//downloadButton控制下载的方法
- (IBAction)downloadTask:(id)sender {

    //记住这个套路！！！

    //下载地址
    NSString *urlString = @"http://218.76.27.57:8080/chinaschool_rs02/135275/153903/160861/160867/1370744550357.mp3";
    //创建请求对象
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:urlString]];

    //创建会话管理对象（在不使用Configuration来设置时用默认的manager足矣）
    AFHTTPSessionManager *sessionManager = [AFHTTPSessionManager manager];

    //创建下载任务
    NSURLSessionDownloadTask *downloadTask = [sessionManager downloadTaskWithRequest:request progress:^(NSProgress *downloadProgress) {

        //progressView和progressLabel同步进度
        _progressView.observedProgress = downloadProgress;

        NSString *progressString = [NSString stringWithFormat:@"%.1f%%", downloadProgress.completedUnitCount * 1.0 / downloadProgress.totalUnitCount * 100];

        [_progressLabel performSelectorOnMainThread:@selector(setText:) withObject:progressString waitUntilDone:YES];


    } destination:^NSURL * _Nonnull(NSURL * _Nonnull targetPath, NSURLResponse * _Nonnull response) {

        //接收到响应，准备开始接受数据
        NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)response;

        //打印请求状态码
        NSLog(@"状态码:%li", httpResponse.statusCode);

        //targetPath临时问价保存路径

        //返回值为本次下载任务的保存路径
        NSString *filePath1 = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/菊花台.mp3"];

        //此block返回值为下载完之后文件存放的路径
        //这个返回的NSURL后面会传到filePath，因此这里自己设置的filePath可以随意取名
        return [NSURL fileURLWithPath:filePath1];


    } completionHandler:^(NSURLResponse * _Nonnull response, NSURL * _Nullable filePath, NSError * _Nullable error) {

        //这个block返回的filePath实际上就是我们上面给他的确定的filePath,在这里他提供了这个可查下载文件路径的参数
        NSLog(@"下载完成路径:%@", filePath);
    }];

    //开始任务
    [downloadTask resume];

    //设置progressView的进度
//    [_progressView setProgressWithDownloadProgressOfTask:downloadTask animated:YES];
}

使用AFNetworking实现基础的上传任务（本地上传图片和文字到新浪微博，新浪微博的用户token和发布微博消息的api已拿到）

#import "AFNetworking.h"
#import "UIKit+AFNetworking.h"
#import "UIProgressView+AFNetworking.h"
#import "ViewController.h"

@class AFHTTPSessionManager;

@interface ViewController () 

@property (weak, nonatomic) IBOutlet UIProgressView *progressView;
@property (weak, nonatomic) IBOutlet UITextField *textField;
@property (weak, nonatomic) IBOutlet UILabel *progressLabel;



@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}





- (IBAction)uploadTask:(id)sender {

    if (_textField.text.length == 0) {
        return;
    }

    //上传路径
    NSString *urlString = @"https://api.weibo.com/2/statuses/upload.json";
    //登录认证
    NSString *token = @"2.00hd363CtKpsnBedca9b3f35tBYiPD";

    //拼接参数列表
    NSDictionary *dic = @{@"access_token" : token, @"status" : _textField.text};

    //创建manager
    AFHTTPSessionManager *sessionManager = [AFHTTPSessionManager manager];

    //创建上传方法
    NSURLSessionDataTask *dataTask = [sessionManager POST:urlString parameters:dic constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {

        //本地文件路径
        NSString *filePath = [[NSBundle mainBundle] pathForResource:@"gem" ofType:@"jpeg"];

        NSData *imageData = [NSData dataWithContentsOfFile:filePath];

        //添加上传的数据
        [formData appendPartWithFileData:imageData name:@"pic" fileName:@"gem.jpeg" mimeType:@"image/jpeg"];

        //新版本AFNetworking提供了progress的参数
    } progress: ^(NSProgress * uploadProgress){


        NSLog(@"%@", uploadProgress);

        //progressLabel和progressView同步显示进程
        NSString *labelString = [NSString stringWithFormat:@"%.1f%%", (CGFloat)uploadProgress.completedUnitCount / uploadProgress.totalUnitCount * 100];

        [_progressLabel performSelectorOnMainThread:@selector(setText:) withObject:labelString waitUntilDone:YES];

        _progressView.observedProgress = uploadProgress;

    }success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {

        NSLog(@"上传成功:%@", responseObject);

    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {

        NSLog(@"上传失败:%@",error);

    }];



//    [_progressView setProgressWithUploadProgressOfTask:(NSURLSessionUploadTask *)dataTask animated:YES];

}