how to load the data from server in viewcontroller IOS

Question

hi I’m trying load data from my online server to view controller but I m getting few issues in that. Using the nsobject and json I’m trying to load in my view controller. I’m stuck with connecting the nsobject to the labels which i have in my storybord.

this is the nsboject code h file and m file

@interface vote : NSObject

@property (nonatomic,strong) NSString * question;
@property (nonatomic,strong) NSString * choose1;
@property (nonatomic,strong) NSString * choose2;

-(id) initWithquestion: (NSString *) qut andchoose1: (NSString *) ch andchoose2: (NSString *) cho;

this is code which i have used in my viewcontorller m file to get the datas.

#define getDataURL @"http://localhost/poll/view.php"
@implementation pollingpoliticalViewController
@synthesize que,cho1,cho2;
@synthesize json,pollarray;

 - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
   {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
    // Custom initialization
   }
  return self;
  }

   - (void)viewDidLoad
   {
    [super viewDidLoad];
    //vote *cnnt = [pollarray ];


// Do any additional setup after loading the view.
   }

   -(void) retrieveData
 {

     NSURL * url =[NSURL URLWithString:getDataURL];
     NSData * data=[NSData dataWithContentsOfURL:url];

    json =[NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];

     pollarray = [[NSMutableArray alloc]init];


    for (int i=0; i<json.count; i++) {

    NSString * dd =[[json objectAtIndex:i]objectForKey:@"ques"];
    NSString * plae= [[json objectAtIndex:i]objectForKey:@"choss1"];
    NSString * ti =[[json objectAtIndex:i]objectForKey:@"choss2"];

    vote *myarray =[[vote alloc]initWithquestion:dd andchoose1:plae andchoose2:ti];

    [pollarray addObject:myarray];
  }
  }

im stuck with the connecting with mutable array to the label which in my view controller so pls somebody suggest weather this is right way to do or what i have to do connect the datas to my view controller..

in tableview we use like we use like this:

    fieldpolitical * cunt=[eventarray objectAtIndex:indexPath.row];

    detailvc.detail = cunt.title;
    detailvc.pla = cunt.place;
    detailvc.tim = cunt.time;
    detailvc.dat = cunt.date;
  //  detailvc.stott

i want to do same thing for my controller view

thanks

Answer 1

You should have to use NSURLConnection class for loading data from server. See example from following link:- http://codewithchris.com/tutorial-how-to-use-ios-nsurlconnection-by-example/#asynchronous

Also there is an external library for networking called AFNetworking, which is one of the best networking library for iOS and Mac OS X. You can visit this link:- http://afnetworking.com/ . You can find tutorial on AFNetworking from following link:- http://www.raywenderlich.com/30445/afnetworking-crash-course

If you want to go with synchronous method then you should have to use dispatch_async like as

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),
    ^{
        // ... perform a blocking, synchronous URL retrieval ...
        NSURL * url =[NSURL URLWithString:getDataURL];
        NSData * data=[NSData dataWithContentsOfURL:url];

        // ... and hop back onto the main queue to handle the result
        dispatch_async(dispatch_get_main_queue(),
        ^{
            json =[NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];

            pollarray = [[NSMutableArray alloc]init];


            for (int i=0; i<json.count; i++) {

            NSString * dd =[[json objectAtIndex:i]objectForKey:@"ques"];
            NSString * plae= [[json objectAtIndex:i]objectForKey:@"choss1"];
            NSString * ti =[[json objectAtIndex:i]objectForKey:@"choss2"];

            vote *myarray =[[vote alloc]initWithquestion:dd andchoose1:plae andchoose2:ti];

            [pollarray addObject:myarray];
        });
    });

Hope It will help you.