Automatically suggest name(s) from contact list with respect to letter entered in textfield - iphone

Question

I have a textfield where the user enters the name.Now when a letter is typed in the textfield,let's say "T",then how can I get suggestions of names from contact list in iphone with respect to that letter entered.
Also I need to display the appropriate number corresponding to the name entered.
I have gone through apple documentation,
Can anyone please help me out with valuable suggestions or sample code snippet:
Thanks in advance :)
EDIT
I was able to view the contacts in log(console),as I wrote the code suggested by Mr.Anil Kothari in viewDidLoad method
As suggested by Mr.Anil Kothari,I have implemented the search bar code for textfield delegate methods as follows:
- (void)textFieldDidBeginEditing:(UITextField *)atextField
{
if(searching)
return;
searching = YES;
}
- (void) searchTableView
{
textField = [self.fields objectAtIndex:0];
NSString *searchText = textField.text;
for (UIView *subview in searchBar.subviews)
{
if ([subview isKindOfClass:[UITextField class]])
{
textField = (UITextField *)subview;
break;
}
}
textField.enablesReturnKeyAutomatically = NO;
NSMutableArray *searchArray = [[NSMutableArray alloc] init];
//searchArray contains matched names of friends with the searching string
for (NSString *sTemp in contactList)
{
txtToSearch =[[NSString alloc] initWithString:[sTemp substringWithRange:NSMakeRange(0,[searchText length])]];
textField = [self.fields objectAtIndex:0];
txtToSearch = textField.text;
NSRange titleResultsRange = [sTemp rangeOfString:searchText options:NSCaseInsensitiveSearch];
if (titleResultsRange.length > 0)
[copyListOfItems addObject:sTemp];
}
[searchArray release];
searchArray = nil;
}
-(BOOL)textField:(UITextField *)atextField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
[copyListOfItems removeAllObjects];
if([string length] > 0)
{
searching = YES;
[self searchTableView];
}
else
{
searching = NO;
}
}
But still not working :(

Answer 1

Check the Code I have already done in some application this kind of stuff:-
- (void)viewDidLoad {
[super viewDidLoad];
self.tblSearchList.tableHeaderView = searchBar;
contactList=[[NSMutableArray alloc]init];
copyListOfItems=[[NSMutableArray alloc]init];
ABAddressBookRef addressBook = ABAddressBookCreate( );
CFArrayRef allPeople = ABAddressBookCopyArrayOfAllPeople( addressBook );
CFIndex nPeople = ABAddressBookGetPersonCount( addressBook );
for ( int i = 0; i < nPeople; i++ )
{
ABRecordRef ref = CFArrayGetValueAtIndex( allPeople, i );
NSString *contactName =[[NSString alloc] initWithString:(NSString *)ABRecordCopyValue(ref,kABPersonFirstNameProperty)];
NSLog(#"% # ",contactName);
[contactList addObject:contactName];
[contactName release];
}
}
searchBar Delegate's
- (void) searchBarTextDidBeginEditing:(UISearchBar *)theSearchBar {
if(searching)
return;
searching = YES;
}
- (void)searchBar:(UISearchBar *)theSearchBar textDidChange:(NSString *)searchText {
[copyListOfItems removeAllObjects];
if([searchText length] > 0) {
searching = YES;
[self searchTableView];
}
else {
searching = NO;
}
[self.tblSearchList reloadData];
}
- (void) searchTableView {
NSString *searchText = searchBar.text;
NSMutableArray *searchArray = [[NSMutableArray alloc] init];
//searchArray contains matched names of friends with the searching string
for (NSString *sTemp in contactList)
{
NSString *txtToSearch =[[NSString alloc] initWithString:[sTemp substringWithRange:NSMakeRange(0,[searchText length])]];
NSRange titleResultsRange = [sTemp rangeOfString:searchText options:NSCaseInsensitiveSearch];
if (titleResultsRange.length > 0)
[copyListOfItems addObject:sTemp];
}
[searchArray release];
searchArray = nil;
}
- (void) doneSearching_Clicked:(id)sender {
searchBar.text = #"";
[searchBar resignFirstResponder];
searching = NO;
[self.tblSearchList reloadData];
}
tableView Delegate's
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
// Customize the number of rows in the table view.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
if (searching)
return [copyListOfItems count];
}
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
if(searching)
return #"Search Results";
return #"";
}
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
}
if(searching)
cell.textLabel.text = [copyListOfItems objectAtIndex:indexPath.row];
return cell;
}
fell free to ask for any further queries..

Answer 2

You should use UISearchBar, implement the delegate method:
- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
Take the letter\s from searchText and fetch the contacts using ABAddressBookRef then update the SearchDisplayController accordingly..
hope this helps a little