首先导入categorylist文件和 AFNetworking文件
再创建mymodel继承月NSobject
在mymodel.h里面写:@property(nonatomic,strong) NSString *categoryId,*categoryName,*count,*lessenPrice;(后面的属性是解析对应的属性名,自己找)
别忘了开启网络数据
在viewcontroller.m里面写:

先导入头文件
#import"AFHTTPSessionManager.h"
#import"mymodel.h"
#define JSON_URL @“http://iappfree.candou.com:8080/free/categories/free”
#define PATH @“http://api.izhangchu.com” // methodName: HomeIndex
@interface ViewController ()<UITableViewDataSource,UITableViewDelegate>
@property (weak, nonatomic) IBOutlet UITableView *tableview;

@property(nonatomic,strong)NSMutableArray *datasource;

@end

@implementation ViewController

• (void)viewDidLoad {
  [super viewDidLoad];
  self.tableview.delegate=self;
  self.tableview.dataSource=self;
  self.datasource=[NSMutableArray new];
  }

• (IBAction)GET:(id)sender {
  //创建数据请求管理对象
  AFHTTPSessionManager *mananger=[AFHTTPSessionManager manager];
  //这是关闭它的自动解析功能
  //mannage.responseSerializer = [AFHTTPResponseSerializer serializer];
  //添加的支持的解析类型@“text/html”,
  mananger.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@“application/json”];
  //GET 接口
  [mananger GET:JSON_URL parameters:nil headers:nil progress:^(NSProgress * _Nonnull downloadProgress) {

  } success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject) {
  //数据请求的成功回调
  NSLog(@"%@",responseObject);
  for (NSDictionary *dic in responseObject[@“category”]) {
  mymodel *model=[[mymodel alloc]init];
  [model setValuesForKeysWithDictionary:dic];
  [self.datasource addObject:model];
  }
  //重要的一点
  dispatch_async(dispatch_get_main_queue(), ^{
  [self.tableview reloadData];
  });
  } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
  //数据请求的失败回调
  NSLog(@"%@",error);
  }];
  }

• (IBAction)POST:(id)sender {
  AFHTTPSessionManager *manager=[AFHTTPSessionManager manager];
  //拼接参数 methodName: HomeIndex
  NSDictionary *dic=@{@“methodName”?“HomeIndex”};
  //POST
  [manager POST:PATH parameters:dic headers:nil progress:^(NSProgress * _Nonnull uploadProgress) {

  } success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject) {
  NSLog(@"%@",responseObject);
  } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
  NSLog(@"%@",error);
  }];

}

• (IBAction)monitor:(id)sender {
  //做一个网络状态监听
  AFHTTPSessionManager manager=[AFHTTPSessionManager manager];
  [manager.reachabilityManager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
  / AFNetworkReachabilityStatusUnknown = -1,
  AFNetworkReachabilityStatusNotReachable = 0,
  AFNetworkReachabilityStatusReachableViaWWAN = 1,
  AFNetworkReachabilityStatusReachableViaWiFi = 2,*/
  NSLog(@"%ld",(long)status);
  }];
  //开始监听
  [manager.reachabilityManager startMonitoring];
  //关闭监听
  //[manager.reachabilityManager stopMonitoring];
  }

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return _datasource.count;
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:@“cell”];
if (!cell) {
cell=[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@“cell”];
}
if (self.datasource.count>0) {
mymodel *model=datasource[indexPath.row];
cell.imageView.image=[UIImage imageNamed:[NSString stringWithFormat:@"category%@.jpg",model.categoryName]];
cell.textLabel.text=model.categoryName;
cell.detailTextLabel.text=[NSString stringWithFormat:@“共有%@款,其中%@款限免”,model.count,model.lessenPrice];
}
return cell;
}
@end

######双层取值:
AFHTTPSessionManager *HttpHandle=[AFHTTPSessionManager manager];
//用post请求数据
[HttpHandle POST:@“http://v.juhe.cn/joke/content/list.php?time=1418745237&key=eaaf69cdca2f46e403a264f5ef7cb74b” parameters:nil headers:nil progress:^(NSProgress * _Nonnull uploadProgress) {

} success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {NSLog(@"%@",responseObject);//字典数组双层取值NSDictionary *alldic=responseObject[@"result"];NSArray *dicArr = [alldic objectForKey:@"data"];for (NSDictionary *dic in dicArr) {mymodel *mod=[[mymodel alloc]init];[mod setValuesForKeysWithDictionary:dic];[self.datasource addObject:mod];}dispatch_async(dispatch_get_main_queue(), ^{[self.tbv reloadData];});
} failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {NSLog(@"%@",error);
}];