tableView cellForRowAtIndexPath calling later - ios

Question

I am fetching contact from device and show in tableview
but first time on contact screen pop show for contact permission, when i click on okey tableview numberofrow called but cellForRowAtIndexPath calling after 5 seconds
I am using this code (this problem only comes first time when new app install)
and i added delegate and datasource in xib and .h file
-(void)getContactsFromAddressBook
{
addressBook = ABAddressBookCreateWithOptions(NULL, NULL);
if (ABAddressBookGetAuthorizationStatus() == kABAuthorizationStatusNotDetermined) {
ABAddressBookRequestAccessWithCompletion(addressBook,
^(bool granted, CFErrorRef error) {
if (granted)
[self loadContacts];
});
}
else if (ABAddressBookGetAuthorizationStatus() == kABAuthorizationStatusAuthorized) {
[self loadContacts];
}
else {
UIAlertView *alert=[[UIAlertView alloc] initWithTitle:Nil message:#"You don't have permission of access contacts for access go to Setting-> Doubls-> Contacts" delegate:nil cancelButtonTitle:#"OK" otherButtonTitles:nil];
[alert show];
}
}
//Load contact
-(void)loadContacts
{
[arr_Contact removeAllObjects];
CFErrorRef *error = NULL;
ABAddressBookRef addressBook = ABAddressBookCreateWithOptions(NULL, error);
allPeople = ABAddressBookCopyArrayOfAllPeople(addressBook);
CFIndex numberOfPeople = ABAddressBookGetPersonCount(addressBook);
//arr_Contact = (__bridge NSMutableArray*)allPeople;
for(int i = 0; i < numberOfPeople; i++) {
ABRecordRef person = CFArrayGetValueAtIndex( allPeople, i );
NSString *firstName = (__bridge NSString *)(ABRecordCopyValue(person, kABPersonFirstNameProperty));
NSString *lastName = (__bridge NSString *)(ABRecordCopyValue(person, kABPersonLastNameProperty));
//NSLog(#"Name:%# %#", firstName, lastName);
ABMultiValueRef phoneNumbers = ABRecordCopyValue(person, kABPersonPhoneProperty);
NSString *phoneNumber;
for (CFIndex i = 0; i < ABMultiValueGetCount(phoneNumbers); i++) {
phoneNumber = (__bridge_transfer NSString *) ABMultiValueCopyValueAtIndex(phoneNumbers, i);
// NSLog(#"phone:%#", phoneNumber);
}
NSMutableDictionary *dic = [[NSMutableDictionary alloc] init];
if(firstName == nil)
{
firstName = #"";
}
if(lastName == nil)
{
lastName = #"";
}
if(phoneNumber == nil)
{
continue;
}
[dic setValue:[NSString stringWithFormat:#"%# %#",firstName,lastName] forKey:#"firstName"];
//[dic setValue:lastName forKey:#"lastName"];
[dic setValue:phoneNumber forKey:#"phonesNum"];
[arr_Contact addObject:dic];
}
NSLog(#"arr all contact %#",arr_Contact);
NSSortDescriptor *sorter = [[NSSortDescriptor alloc]
initWithKey:#"firstName"
ascending:YES
selector:#selector(compare:)] ;
NSArray *sortDescriptors = [NSArray arrayWithObject: sorter];
[arr_Contact sortUsingDescriptors:sortDescriptors];
[arr_afterSearch addObjectsFromArray:arr_Contact];
[self createSectionList:arr_Contact];
}
//create section
- (void) createSectionList: (id) wordArray
{
for (int i = 0; i < 27; i++) [arr_searchContact addObject:[[NSMutableArray alloc] init]];
int k=0;
NSLog(#"arr count is %lu",(unsigned long)[arr_Contact count]);
for (k=0; k<[arr_Contact count]; k++) {
NSString *word = [NSString stringWithFormat:#"%#",[[arr_Contact valueForKey:#"firstName"]objectAtIndex:k]];
if ([word length] == 0) continue;
#try {
range1 = [ALPHA rangeOfString:[[word substringToIndex:1] uppercaseString]];
[[arr_searchContact objectAtIndex:range1.location]addObject:[arr_Contact objectAtIndex:k]];
}
#catch (NSException * e) {
[[arr_searchContact objectAtIndex:26]addObject:[arr_Contact objectAtIndex:k]];
NSLog(#"error");
}
#finally {
}
}
[self.tblContact reloadData];
}
//tableview delegate
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
NSInteger rows=0;
if (IsSearching==TRUE) {
rows=[arr_afterSearch count];
}
else{
rows=[[arr_searchContact objectAtIndex:section] count];
}
return rows;
}
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 40;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
NSInteger section=0;
if (IsSearching==TRUE) {
section=1;
}
else{
if ([arr_searchContact count]>0) {
section=[ALPHA_ARRAY count];
}
else{
section=0;
}
}
return section;
}
- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView
{
if (IsSearching==TRUE) {
return nil;
}
else{
return ALPHA_ARRAY;
}
}
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection: (NSInteger)section
{
// create the parent view that will hold header Label
if (IsSearching==TRUE) {
return nil;
}
else{
if([[arr_searchContact objectAtIndex:section] count]==0)
{
return nil;
}
else {
UIView* customView = [[UIView alloc] initWithFrame:CGRectMake(5.0, 0.0, 320.0, 25.0)];
[customView setBackgroundColor:[UIColor colorWithRed:236.0/255.0 green:239.0/255.0 blue:240.0/255.0 alpha:1.0]];
UILabel * headerLabel = [[UILabel alloc] initWithFrame:CGRectZero];
headerLabel.backgroundColor = [UIColor clearColor];
headerLabel.font = [UIFont systemFontOfSize:14];
headerLabel.frame = CGRectMake(10.0, 0.0, 300.0, 24.0);
[headerLabel setText:[NSString stringWithFormat:#"%#",[ALPHA_ARRAY objectAtIndex:section]]];
[headerLabel setTextColor:[UIColor lightGrayColor]];
[customView addSubview:headerLabel];
return customView;
}
}
}
-(CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
if (IsSearching==TRUE) {
return 0;
}
else{
if([[arr_searchContact objectAtIndex:section] count]==0)
{
return 0;
}
else
{
return 25;
}
}
}
-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *cellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
cell.backgroundColor=[UIColor clearColor];
cell.accessoryType = UITableViewCellAccessoryNone;
UIView *selectionView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 280, 46)];
[selectionView setBackgroundColor:[UIColor colorWithRed:236.0/255.0 green:82.0/255.0 blue:91.0/255.0 alpha:1.0]];
cell.selectedBackgroundView = selectionView;
if ([tableView respondsToSelector:#selector(setSectionIndexColor:)]) {
tableView.sectionIndexBackgroundColor = [UIColor colorWithRed:250.0/255.0 green:250.0/255.0 blue:250.0/255.0 alpha:0.3];
tableView.sectionIndexTrackingBackgroundColor = [UIColor whiteColor];
}
}
NSMutableDictionary *dic = [arr_Contact objectAtIndex:indexPath.row];
//cell.textLabel.text = [dic objectForKey:#"firstName"];
//cell.lastNameLabel.text = [dic objectForKey:#"lastName"];
if (IsSearching==TRUE) {
NSDictionary *dic=[arr_afterSearch objectAtIndex:indexPath.row];
if ([[dic objectForKey:#"firstName"] length]>0) {
cell.textLabel.text = [dic objectForKey:#"firstName"];
}
else{
cell.textLabel.text =[dic objectForKey:#"phonesNum"];
}
}
else{
NSDictionary *dic=[[arr_searchContact objectAtIndex:indexPath.section]objectAtIndex:indexPath.row];
if ([[dic objectForKey:#"firstName"] length]>0) {
cell.textLabel.text = [dic objectForKey:#"firstName"];
}
else{
cell.textLabel.text =[dic objectForKey:#"phonesNum"];
}
}
cell.textLabel.textColor=[UIColor darkGrayColor];
cell.textLabel.highlightedTextColor = [UIColor whiteColor];
cell.textLabel.font=[UIFont fontWithName:#"OpenSans" size:14.0];
return cell;
}

Answer 1

You need to ensure that you only update the UI from the main queue. Your completion handler for the address book access will be executing on a background thread. Change the completion handler to invoke loadContacts on the main queue.
if (ABAddressBookGetAuthorizationStatus() == kABAuthorizationStatusNotDetermined) {
ABAddressBookRequestAccessWithCompletion(addressBook,
^(bool granted, CFErrorRef error) {
if (granted) {
dispatch_async(dispatch_get_main_queue(), ^{
[self loadContacts];
});
}
});