如何從視圖控制器中的服務器加載數據IOS

Question

嗨我想從我的在線服務器加載數據到視圖控制器，但我得到的問題很少。使用nsobject和json我試圖加載我的視圖控制器。我堅持將nsobject連接到我在故事曲目中的標籤。

這是nsboject代碼.h文件和M文件

@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; 

這是我在viewcontorller M檔都用於獲取DATAS代碼。

#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卡與可變數組的標籤在我看來控制器，請有人建議天氣的連接，這是正確的方式做或我必須做的DATAS連接到我的視圖控制器的..

在tableview中，我們使用像我們這樣使用：

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

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

我想要做同樣的事情對我的控制程序圖

感謝

Answer 1

您應該使用NSURLConnection類從服務器加載數據。從下面的鏈接見例如： - http://codewithchris.com/tutorial-how-to-use-ios-nsurlconnection-by-example/#asynchronous

也有聯網被稱爲AFNetworking，這是最好的網絡庫的iOS和Mac OS X你可以訪問此鏈接的一個外部庫： - http://afnetworking.com/。 您可以從以下鏈接AFNetworking找到教程： - http://www.raywenderlich.com/30445/afnetworking-crash-course

如果你想與同步方法去，那麼你應該使用dispatch_async等作爲

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]; 
     }); 
    }); 

希望它會幫助你。