iOS UITableView with 10,000 record SQLLite DB - objective-c

Question

My iOS app populates an SQLlite database (using FMDB) from a web query. There is a UITableView to display this data. Since I started writing the app the size of this db has exploded to about 10,000 records.
My current design is to load the data in an array from the db and then use that in the UITableView. It works, and I have the alphabetized index on the right hand side of the screen for the user to quickly access the data.
The problem of course is it takes 15-20 seconds to load the array. I originally designed this to load every time the user hits the UITableView, but that means 15-20 seconds every time.
Is there a way to only load some of the data in the UITableView while keeping the search functionality and the index?
Can/should I load the array once and reuse it? I have tried but I can't seem to get that work.
As a last resort, I could switch to CoreData but I really don't want to switch horses in midstream.
UITableView implementation:
#import "ContactViewController.h"
#import "ContactDetailViewController.h"
#interface ContactViewController ()
#end
#implementation ContactViewController {
NSMutableArray *_contacts;
UISearchDisplayController *searchController;
BOOL isSearching;
}
- (void)awakeFromNib {
if ([[UIDevice currentDevice] userInterfaceIdiom] ==
UIUserInterfaceIdiomPad) {
self.clearsSelectionOnViewWillAppear = NO;
self.preferredContentSize = CGSizeMake(320.0, 600.0);
}
[super awakeFromNib];
}
- (void)viewDidLoad {
[super viewDidLoad];
// Get array of employees and sections
_contacts = [ContactsDatabase getContacts];
self.sections = [ContactsDatabase getSections:_contacts];
// Set up Search
self.searchDisplayController.displaysSearchBarInNavigationBar = YES;
self.filteredContacts = [NSMutableArray array];
searchController.delegate = self;
searchController.searchResultsDataSource = self;
isSearching = FALSE;
// iPad
// self.dtailViewController = (detailViewController
// *)[[self.splitViewController.viewControllers lastObject]
// topViewController];
// Set the back bar button
UIBarButtonItem *backButton =
[[UIBarButtonItem alloc] initWithTitle:#"Contacts"
style:UIBarButtonItemStylePlain
target:nil
action:nil];
self.navigationItem.backBarButtonItem = backButton;
}
#pragma mark - Table View
- (NSInteger)tableView:(UITableView *)tableView
numberOfRowsInSection:(NSInteger)section {
NSInteger tmpRows;
if (tableView == self.searchDisplayController.searchResultsTableView) {
tmpRows = [self.filteredContacts count];
} else {
tmpRows = [[self.sections
valueForKey:[[[self.sections allKeys]
sortedArrayUsingSelector:
#selector(localizedCaseInsensitiveCompare:)]
objectAtIndex:section]] count];
}
return tmpRows;
}
- (UITableViewCell *)tableView:(UITableView *)tableView
cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell =
[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [self.tableView dequeueReusableCellWithIdentifier:CellIdentifier];
}
if (isSearching) {
contact *thisContact = [self.filteredContacts objectAtIndex:indexPath.row];
cell.textLabel.text = thisContact.cmpNme;
} else {
contact *thisContact = [[self.sections
valueForKey:[[[self.sections allKeys]
sortedArrayUsingSelector:
#selector(localizedCaseInsensitiveCompare:)]
objectAtIndex:indexPath.section]]
objectAtIndex:indexPath.row];
cell.textLabel.text = thisContact.cmpNme;
}
return cell;
}
#pragma mark - Table Sections
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
NSInteger tmpCount;
if (isSearching) {
tmpCount = 1;
} else {
tmpCount = [[self.sections allKeys] count];
}
return tmpCount;
}
- (NSString *)tableView:(UITableView *)tableView
titleForHeaderInSection:(NSInteger)section {
NSString *tmpString;
if (tableView == self.searchDisplayController.searchResultsTableView) {
tmpString = nil;
} else {
tmpString = [[[self.sections allKeys]
sortedArrayUsingSelector:#selector(localizedCaseInsensitiveCompare:)]
objectAtIndex:section];
}
return tmpString;
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([[segue identifier] isEqualToString:#"showContactDetail"]) {
contact *dtlContact;
if (isSearching) {
dtlContact = [self.filteredContacts
objectAtIndex:self.searchDisplayController.searchResultsTableView
.indexPathForSelectedRow.row];
} else {
dtlContact = [[self.sections
valueForKey:[[[self.sections allKeys]
sortedArrayUsingSelector:
#selector(localizedCaseInsensitiveCompare:)]
objectAtIndex:[self.tableView indexPathForSelectedRow]
.section]]
objectAtIndex:[self.tableView indexPathForSelectedRow].row];
}
self.contactDetailViewController.detailItem = dtlContact;
[[segue destinationViewController] setDetailItem:dtlContact];
}
}
#pragma mark - Right side bar alphabetical index
- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView {
NSArray *tmpTitle;
if (isSearching) {
tmpTitle = nil;
} else {
tmpTitle = [[self.sections allKeys]
sortedArrayUsingSelector:#selector(localizedCaseInsensitiveCompare:)];
}
return tmpTitle;
}
#pragma mark - Search methods
- (void)searchDisplayControllerWillBeginSearch:
(UISearchDisplayController *)controller {
isSearching = TRUE;
self.searchDisplayController.searchBar.showsCancelButton = YES;
[self.tableView reloadSectionIndexTitles];
}
- (void)searchDisplayControllerDidEndSearch:
(UISearchDisplayController *)controller {
isSearching = FALSE;
self.searchDisplayController.searchBar.showsCancelButton = NO;
[self.tableView reloadSectionIndexTitles];
}
- (void)filterContentForSearchText:(NSString *)searchText
scope:(NSString *)scope {
[self.filteredContacts removeAllObjects];
NSPredicate *predicate =
[NSPredicate predicateWithFormat:#"cmpNme contains[c] %#", searchText];
NSArray *tempArray = [_contacts filteredArrayUsingPredicate:predicate];
// Move to filtered array
self.filteredContacts = [NSMutableArray arrayWithArray:tempArray];
self.sections = [ContactsDatabase getSections:_contacts];
}
- (BOOL)searchDisplayController:(UISearchDisplayController *)controller
shouldReloadTableForSearchString:(NSString *)searchString {
isSearching = TRUE;
[self
filterContentForSearchText:searchString
scope:[self.searchDisplayController.searchBar
.scopeButtonTitles
objectAtIndex:
self.searchDisplayController.searchBar
.selectedScopeButtonIndex]];
return YES;
}
#end
getContacts methods
+ (NSMutableArray *)getContacts {
id tmpDatabasePath = [(AppDelegate *)
[[UIApplication sharedApplication] delegate] databasePathContacts];
NSMutableArray *tmpContacts;
tmpContacts = [[NSMutableArray alloc] init];
FMDatabase *db = [FMDatabase databaseWithPath:tmpDatabasePath];
[db open];
FMResultSet *results =
[db executeQuery:#"SELECT * FROM contacts ORDER by cmpNme"];
while ([results next]) {
contact *thisContact = [contact new];
thisContact.cmpNme = [results stringForColumn:#"cmpNme"];
thisContact.fstNme = [results stringForColumn:#"fstNme"];
thisContact.lstNme = [results stringForColumn:#"lstNme"];
thisContact.cntTyp = [results stringForColumn:#"cnttyp"];
NSString *tst = [results stringForColumn:#"phnNbr"];
thisContact.phnNbr = [NSNumber numberWithInt:[tst intValue]];
thisContact.adr1 = [results stringForColumn:#"adr1"];
thisContact.adr2 = [results stringForColumn:#"adr2"];
thisContact.cty = [results stringForColumn:#"cty"];
thisContact.ste = [results stringForColumn:#"ste"];
tst = [results stringForColumn:#"zip"];
thisContact.zip = [NSNumber numberWithInt:[tst intValue]];
thisContact.ema = [results stringForColumn:#"ema"];
tst = [results stringForColumn:#"id"];
thisContact.id = [NSNumber numberWithInt:[tst intValue]];
[tmpContacts addObject:thisContact];
}
[db close];
return tmpCon