Allow App to use contacts pop up not appearing ios7 - iphone

Question

I am using an application where i want to fetch contacts.The problem is that the app only asks for the first time that app would like to use contacts.Even if i delete the application,clean it and run again,the application is not asking the pop up next time it runs.I debugged the code and found that the permission i gave for the first time is executed.how to solve this.Below is the code i wrote in view did load.
CFErrorRef *error=nil;
ABAddressBookRef addressbook=ABAddressBookCreateWithOptions(NULL, error);
CFArrayRef allpeople=ABAddressBookCopyArrayOfAllPeople(addressbook);
CFIndex npeople=ABAddressBookGetPersonCount( addressbook );
ABAddressBookRef addressBookRef = ABAddressBookCreateWithOptions(NULL, NULL);
if (ABAddressBookGetAuthorizationStatus() == kABAuthorizationStatusNotDetermined) {
ABAddressBookRequestAccessWithCompletion(addressBookRef, ^(bool granted, CFErrorRef error) {
if (granted) {
for ( int i = 0; i < npeople; i++ )
{
ABRecordRef ref = CFArrayGetValueAtIndex( allpeople, i );
NSString *firstName = (__bridge NSString *)(ABRecordCopyValue(ref, kABPersonFirstNameProperty));
NSString *lastName = (__bridge NSString *)(ABRecordCopyValue(ref, kABPersonLastNameProperty));
NSLog(#"Name:%# %#", firstName, lastName); }
// First time access has been granted, add the contact
} else {
// User denied access
// Display an alert telling user the contact could not be added
}
});
}
else if (ABAddressBookGetAuthorizationStatus() == kABAuthorizationStatusAuthorized) {
for ( int i = 0; i < npeople; i++ )
{
ABRecordRef ref = CFArrayGetValueAtIndex( allpeople, i );
NSString *firstName = (__bridge NSString *)(ABRecordCopyValue(ref, kABPersonFirstNameProperty));
NSString *lastName = (__bridge NSString *)(ABRecordCopyValue(ref, kABPersonLastNameProperty));
NSLog(#"Name:%# %#", firstName, lastName); }
// The user has previously given access, add the contact
}
else {
for ( int i = 0; i < npeople; i++ )
{
ABRecordRef ref = CFArrayGetValueAtIndex( allpeople, i );
NSString *firstName = (__bridge NSString *)(ABRecordCopyValue(ref, kABPersonFirstNameProperty));
NSString *lastName = (__bridge NSString *)(ABRecordCopyValue(ref, kABPersonLastNameProperty));
NSLog(#"Name:%# %#", firstName, lastName); }
// The user has previously denied access
// Send an alert telling user to change privacy setting in settings app
}

Answer 1

Follow the following procedure
Go to Device's Setting->General->Reset->Reset Location & Privacy.
Then it should ask you for permission.