获取网络数据

xcode7.0以上版本需要在info上添加 App Transport Security Settings 类型为字典  在字典里面添加Allow Arbitrary Loads 布尔型 YES
从plist文件获取数据

NSBundle* boule=[NSBundle mainBundle];

 NSString* path=[boule pathForResource:@"dddd" ofType:@"plist"];

  NSDictionary * dic=[[NSDictionary alloc]initWithContentsOfFile:path]; 

    NSMutableArray * arr=dic[@"name"];

//网络图片：(同步)

NSString* string=@"http://api.k780.com:88/upload/weather/d/1.gif";

 NSData * data = [NSData dataWithContentsOfURL:[NSURL URLWithString:string]];    

UIImage *image =[ UIImage imageWithData:data];

//Json格式数据:
网络请求类型：
//同步
　　NSString* str=@"http://www.weather.com.cn/data/sk/101010100.html";
    NSURL* url=[NSURL URLWithString:str];
    NSURLRequest * request=[[NSURLRequest alloc]initWithURL:url];
    NSData* data=[NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
　　//必须等data获取完之后才能执行下面代码
    NSDictionary* dataDit=[NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil];
    NSLog(@"%@",dataDit);
//异步

　

　　NSString* string=@"资源地址";//比如图片资源
　　NSURL* url=[[NSURL alloc ]initWithString:string];
　　NSURLRequest* request=[[NSURLRequest alloc]initWithURL:url];

/*
第一个参数为请求对象
第二个参数为该异步请求所在线程执行的操作
第三个参数为异步请求够执行的代码块
*/

　　[NSURLConnection sendAsynchronousRequest:request queue:[[NSOperationQueue alloc]init] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
　　//本代码块的执行时机为：异步请求完成，取得响应的数据
　　//代码段第一个参数为响应对象，第二个为接收到的数据，第三个位错误对象
　　UIImage* img=[UIImage imageWithData:data];
　　NSLog(@"%@",connectionError);
}];

//本地JSON格式

 NSString *dataFilePath =[[NSBundle mainBundle] pathForResource:@"data" ofType:@"json"];

        NSData *data = [NSData dataWithContentsOfFile:dataFilePath];

        NSDictionary *dataDictionary = [NSJSONSerialization JSONObjectWithData:data options: NSJSONReadingAllowFragments error:nil];

 
AFNetWorking

NSString* str=@"网络URL";
    AFHTTPSessionManager* manager = [AFHTTPSessionManager manager];
    manager.responseSerializer = [AFHTTPResponseSerializer serializer];
    manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"application/json"];
    [manager POST:str parameters:nil success:^(NSURLSessionDataTask *task, id responseObject) {
                                       //string
                                       NSString *string1 = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];
                                       NSLog(@"aaa
%@",string1);
    //数组字典都可用这个方法
        NSArray* arr=[NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingMutableLeaves error:nil];
        
                                       NSLog(@"获取成功");
                                       
                                   } failure:^(NSURLSessionDataTask *task, NSError *error) {
                                       
                                       
                                       NSLog(@"获取失败:%@",error);
                                   }];

 判断空类型

 if([_model.processMemo isKindOfClass:NSClassFromString(@"NSNull")]){

        greeLabel.text=@" ";

    }