How to add UIRefreshControl - ios

Question

I want to add UIRefreshControl to my app which fetches the records from the database when the table is pulled down , I have done the following code but it is giving me error like
2014-08-06 12:31:56.263 QuizUsindDB[1183:60b] -[ScoreViewController readScoreFromDatabase]: unrecognized selector sent to instance 0x8d3d8e0
2014-08-06 12:31:56.266 QuizUsindDB[1183:60b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[ScoreViewController readScoreFromDatabase]: unrecognized selector sent to instance 0x8d3d8e0'
*** First throw call stack:
(
0 CoreFoundation 0x018f81e4 __exceptionPreprocess + 180
1 libobjc.A.dylib 0x016778e5 objc_exception_throw + 44
2 CoreFoundation 0x01995243 -[NSObject(NSObject) doesNotRecognizeSelector:] + 275
3 CoreFoundation 0x018e850b ___forwarding___ + 1019
4 CoreFoundation 0x018e80ee _CF_forwarding_prep_0 + 14
5 libobjc.A.dylib 0x0168982b -[NSObject performSelector:withObject:] + 70
6 UIKit 0x003393b9 -[UIApplication sendAction:to:from:forEvent:] + 108
7 UIKit 0x00339345 -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 61
8 UIKit 0x0043abd1 -[UIControl sendAction:to:forEvent:] + 66
9 UIKit 0x0043afc6 -[UIControl _sendActionsForEvents:withEvent:] + 577
10 UIKit 0x0043ac06 -[UIControl sendActionsForControlEvents:] + 48
11 UIKit 0x00a227e9 -[UIRefreshControl _setRefreshControlState:notify:] + 404
12 UIKit 0x00a22650 -[UIRefreshControl setRefreshControlState:] + 48
21 CoreFoundation 0x0195d43e __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 14
22 CoreFoundation 0x0189e5cb __CFRunLoopRun + 1963
23 CoreFoundation 0x0189d9d3 CFRunLoopRunSpecific + 467
24 CoreFoundation 0x0189d7eb CFRunLoopRunInMode + 123
25 GraphicsServices 0x038ec5ee GSEventRunModal + 192
26 GraphicsServices 0x038ec42b GSEventRun + 104
27 UIKit 0x00337f9b UIApplicationMain + 1225
28 QuizUsindDB 0x0001038d main + 141
29 libdyld.dylib 0x01e41701 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
Code for UIRefreshControl is given above:
-(void)pullToRefresh
{
self.refreshControl = [[UIRefreshControl alloc] init];
self.refreshControl.tintColor = [UIColor blackColor];
[self.refreshControl addTarget:self action:#selector(readScoreFromDatabase)
forControlEvents:UIControlEventValueChanged];
[self.myTable addSubview:self.refreshControl];
[self.refreshControl endRefreshing];
}
I have called [self pullToRefresh] in viewDidLoad .
I have the above code for initializing and calling a selector to refresh the table.
I am not able to recognise the error, can anyone point me out mistake.

Answer 1

Change this line:
[self.refreshControl endRefreshing];
To this:
[self.refreshControl beginRefreshing];
The endRefreshing method should be called after your table view has finished reloading data where necessary.
Also, the crash log indicates that your -[ScoreViewController readScoreFromDatabase]: function doesn't exist.