day4---开源库AFNetWorking

一 AFNetWorking
目前非常受欢迎的网络开源库，它拥有良好的架构，丰富的API，以及模块化的构建方式，使用起来非常简洁轻松；
AFNetWorking新版本不仅封装了NSURLConnection，还封装了NSURLSession等相关功能，可以让程序员简单的操作就可以轻松的实现GET/POST请求数据，下载文件，上传文件/上传图片，检测网络状态等相关功能，还非常贴心的帮助程序员直接处理一些JSON/XML格式的解析；

1.1 检测网络状态和GET请求，POST，文件下载
    【Demo】-【1-AFNetWorking_GET】

//检测是否有网络，有什么网络?

• (IBAction)netinfo:(id)sender {
  //1.获取网络监控的管理者
  AFNetworkReachabilityManager *manager = [AFNetworkReachabilityManager sharedManager];

  //2.设置网络方式变化时的代码
  [manager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {

    switch (status) {
        case AFNetworkReachabilityStatusUnknown:
            NSLog(@"未知网络");
            break;
            
        case AFNetworkReachabilityStatusNotReachable:
            NSLog(@"无网络");
            break;
            
        case AFNetworkReachabilityStatusReachableViaWiFi:
            NSLog(@"WIFI");
            break;
            
        case AFNetworkReachabilityStatusReachableViaWWAN:
            NSLog(@"手机自己的网络（3G/4G）");
            break;
            
        default:
            break;
    }
  

  }];

  //3.启动监控
  [manager startMonitoring];

//4.判断是什么网络？(返回的是bool值)
[manager isReachableViaWiFi];//WIFI
[manager isReachableViaWWAN];//蜂窝网络
[manager isReachable];//YES 有网    NO没有网络

}
//get请求数据

• (IBAction)getRequestData:(id)sender {

  //1.获得请求对象
  AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
  //2.设置返回的数据格式
  //直接返回的是NSData类型 [AFHTTPResponseSerializer serializer]
  //返回的是JSON格式 [AFJSONResponseSerializer serializer];
  //返回的是XML格式 [AFXMLParserResponseSerializer serializer];
  manager.responseSerializer = [AFHTTPResponseSerializer serializer];

  //3.发起GET请求
  [manager GET:@"http://mapi.damai.cn/proj/HotProj.aspx?CityId=0&source=10099&version=30602" parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {

    //请求成功
    NSLog(@"请求成功");
    NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingMutableContainers error:nil];
    NSLog(@"%@",dict);
  

  } failure:^(AFHTTPRequestOperation *operation, NSError *error) {

    NSLog(@"请求失败");
  

  }];

}
//POST请求

• (IBAction)postRequestData:(id)sender {

  NSString *urlStr = @"http://10.0.8.8/sns/my/user_list.php";
  //拼接请求体的内容【这里拼接成字典，数组，字符串】
  NSDictionary *bodyDict = @{@"page":@2,@"number":@10};
  NSArray *bodyArr = @[@"page",@3,@"number",@10];
  NSString *bodyStr = @"page=2,number=10";

  //1.创建网络请求对象
  AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

  //2.设置响应格式
  manager.responseSerializer = [AFHTTPResponseSerializer serializer];

  //3.POST请求
  [manager POST:urlStr parameters:bodyDict success:^(AFHTTPRequestOperation *operation, id responseObject) {

    NSLog(@"请求成功");
    NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingMutableContainers error:nil];
    NSLog(@"%@",dict);
  

  } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
  NSLog(@"请求失败");
  }];

}

//文件下载

• (IBAction)downLoadFile:(id)sender {

  NSString *urlStr = @"http://10.6.154.91/share/音乐/好难得.mp3";
  urlStr = [urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

  //1.构造NSURL
  NSURL *url = [NSURL URLWithString:urlStr];

  //2.创建请求对象
  NSURLRequest *request = [NSURLRequest requestWithURL:url];

  //3.创建AFURLSessionManager对象
  AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];

  //4.创建任务
  NSURLSessionDownloadTask *task = [manager downloadTaskWithRequest:request progress:nil destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) {

    //下载成功后，返回最终将要把tmp文件保存的文件存储到哪个目录所对应的路径
    NSString *toPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/好难得.mp3"];
    NSLog(@"%@",toPath);
    NSURL *url = [NSURL fileURLWithPath:toPath];
    return url;
  

  } completionHandler:^(NSURLResponse *response, NSURL *filePath, NSError *error) {
  //不管成功，还是失败都会调用该代码块
  //filePath代表的是下载的文件所在的路径
  //error错误信息，如果为NULL，表示下载成功
  NSLog(@"下载失败:%@",error);

  }];

  //5.启动任务
  [task resume];
  }

• (void)viewDidLoad {
  [super viewDidLoad];

  [UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleLightContent;

}

1.2 进度条监听文件下载的进度
    【Demo】-【2-AFNetWorking_progress】

• (IBAction)downLoadFile:(id)sender {

  NSString *urlStr = @"http://10.6.154.91/share/视频/1.mp4";
  urlStr = [urlStr stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];

  //1.构造NSURL对象
  NSURL *url = [NSURL URLWithString:urlStr];

  //2.创建请求对象
  NSURLRequest *request = [NSURLRequest requestWithURL:url];

  //3.创建AFURLSessionManager对象
  AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];

  //4.创建下载任务
  //第二个参数是进度对象指针的地址，为了返回进度
  NSProgress *progress = nil;
  NSURLSessionDownloadTask *task = [manager downloadTaskWithRequest:request progress:&progress destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) {

    //返回最终文件所对应的目录
    NSString *toPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/1.mp4"];
    return [NSURL fileURLWithPath:toPath];
  

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

    NSLog(@"%@ error:%@",filePath.path,error);
  

  }];

  //5.启动任务
  [task resume];

  //得到progress对象，需要使用成员变量保存起来
  //用成员变量指向，做了一个强引用，保证刚刚创建的progress对象不会在当前方法结束时消失
  self.myProgress = progress;

  //使用kvc/kvo的设计模式，来观察进度
  //让self做为观察者来观察self.myProgress的属性，fractionCompleted（表示完成的进度）
  [self.myProgress addObserver:self forKeyPath:@"fractionCompleted" options:NSKeyValueObservingOptionNew context:nil];

}

//观察者调用的方法
-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
if (object == self.myProgress && [keyPath isEqualToString:@"fractionCompleted"]) {

    //回到主线程,更新进度条的显示
    dispatch_async(dispatch_get_main_queue(), ^{
        
        [self.myProgressView setProgress:self.myProgress.fractionCompleted animated:YES];
        NSLog(@"%.2lf",self.myProgress.fractionCompleted);
    });
    
}

}

二 图片选取器 UIImagePickerController
见【Demo】-【3-UIImagePickerController】

• (IBAction)changeImage:(id)sender {

  //创建图片选取器对象
  UIImagePickerController *pickVC = [[UIImagePickerController alloc] init];

  pickVC.delegate = self;

  [self presentViewController:pickVC animated:YES completion:nil];

}

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

• (void)didReceiveMemoryWarning {
  [super didReceiveMemoryWarning];
  // Dispose of any resources that can be recreated.
  }

pragma mark -图片选取器对应的代理方法

//1.当我们选中相册中的某张图片，调用
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
NSLog(@"选中了某张图片");
//获得选中图片所对应的原图
UIImage *image = info[@"UIImagePickerControllerOriginalImage"];//打印info，找到图片对应的key值
self.myImageView.image = image;
// NSLog(@"%@",info);
[self dismissViewControllerAnimated:YES completion:nil];
}

//2.当我们点击cancle调用
-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
NSLog(@"cancel");
//直接返回
[self dismissViewControllerAnimated:YES completion:nil];

}

关于状态栏样式的设置：
1.在info.plist文件添加属性View controller-based status bar appearance 值设置no
2.在代码部分设置
[UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleLightContent;