-[announceViewController xCJSONDidBeginLoadingJSONData]: unrecognized selector sent to instance 0x7faa01504d50 - ios

Question

I have got this problem cause the app crash:
The probelm start when the app launch when I add the new view to handle 2 uiimages with two buttons
gameApp[5963:1756169] -[announceViewController xCJSONDidBeginLoadingJSONData]: unrecognized selector sent to instance 0x7faa01504d50
2014-11-03 09:16:01.386 gameApp[5963:1756169] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[announceViewController xCJSONDidBeginLoadingJSONData]: unrecognized selector sent to instance 0x7faa01504d50'
*** First throw call stack:
(
0 CoreFoundation 0x0000000107fe9f35 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x0000000107c82bb7 objc_exception_throw + 45
2 CoreFoundation 0x0000000107ff104d -[NSObject(NSObject) doesNotRecognizeSelector:] + 205
3 CoreFoundation 0x0000000107f4908f ___forwarding___ + 495
4 CoreFoundation 0x0000000107f48e18 _CF_forwarding_prep_0 + 120
5 gameApp 0x0000000103d75462 -[XCJSONLoader startLoadFrom:] + 66
6 gameApp 0x0000000103d75de3 -[announceViewController setUpJSON] + 259
7 gameApp 0x0000000103d75c99 -[announceViewController viewDidLoad] + 73
8 UIKit 0x0000000106402a90 -[UIViewController loadViewIfRequired] + 738
9 UIKit 0x0000000106402c8e -[UIViewController view] + 27
10 UIKit 0x0000000106321ca9 -[UIWindow addRootViewControllerViewIfPossible] + 58
11 UIKit 0x0000000106322041 -[UIWindow _setHidden:forced:] + 247
12 UIKit 0x000000010632e72c -[UIWindow makeKeyAndVisible] + 42
13 UIKit 0x00000001062d9061 -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 2628
14 UIKit 0x00000001062dbd2c -[UIApplication _runWithMainScene:transitionContext:completion:] + 1350
15 UIKit 0x00000001062dabf2 -[UIApplication workspaceDidEndTransaction:] + 179
16 FrontBoardServices 0x000000010dfa62a3 __31-[FBSSerialQueue performAsync:]_block_invoke + 16
17 CoreFoundation 0x0000000107f1f53c __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 12
18 CoreFoundation 0x0000000107f15285 __CFRunLoopDoBlocks + 341
19 CoreFoundation 0x0000000107f15045 __CFRunLoopRun + 2389
20 CoreFoundation 0x0000000107f14486 CFRunLoopRunSpecific + 470
21 UIKit 0x00000001062da669 -[UIApplication _run] + 413
22 UIKit 0x00000001062dd420 UIApplicationMain + 1282
23 gameApp 0x0000000103d78913 main + 115
24 libdyld.dylib 0x0000000108c17145 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
and here is the h file :
#import <UIKit/UIKit.h>
#import "XCJSONLoader.h"
#interface announceViewController : UIViewController <XCJSONLoaderDelegate>
#property (strong,nonatomic) XCJSONLoader *jsonLoader;
#property (weak, nonatomic) IBOutlet UIImageView *anImageView;
#property (weak, nonatomic) IBOutlet UIImageView *spImageView;
- (IBAction)anButton:(id)sender;
- (IBAction)spButton:(id)sender;
#end
and this is the .m file
#interface announceViewController () {
NSMutableArray *JSONData;
}
#end
#implementation announceViewController
#synthesize jsonLoader,anImageView,spImageView;
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
[self setUpJSON];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
- (void) setUpJSON
{
jsonLoader = [[XCJSONLoader alloc] init];
[jsonLoader setDelegate:self];
NSString *JSONLink = [NSString stringWithFormat:#"http://ya-techno.com/gameApp/anData.php"]; // Your URL goes here
[jsonLoader startLoadFrom:JSONLink];
}
- (void)xCJSONDidFinishLoadingJSONData
{
JSONData = [jsonLoader getJSONData];
}
- (IBAction)anButton:(id)sender {
JSONData = [jsonLoader getJSONData];
NSString *anButtonString = [NSString stringWithFormat:#"%#", [[JSONData objectAtIndex:0] objectForKey:#"anButton"]];
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:anButtonString]];
}
- (IBAction)spButton:(id)sender {
}
#end
I could not find the problem for this one. Any help

Answer 1

Read the error. It says you haven't implemented the xCJSONDidBeginLoadingJSONData method. And you haven't. You do have the xCJSONDidFinishLoadingJSONData method but not the xCJSONDidBeginLoadingJSONData method.
Add the xCJSONDidBeginLoadingJSONData method to your announceViewController class to fix the problem.
BTW - standard naming conventions state that class names should being with uppercase letters. Method and variable names begin with lowercase letters.