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Search bar application
Posted on: August 31, 2009 at 12:00 AM
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In this iPhone tutorial, we will be creating a Search screen, which have a table view with a search bar. Table should display all the data if search field is empty other wise it should show all the data which matches.

Search bar application

In this tutorial, will be creating a Search screen, which have a table view with a search bar. Table should display all the data if search field is empty other wise it should show all the data which matches.

Project will look like this:

 

Create a new ViewBased Project and name it as Search. The Search screen that you can see in the above images are implemented in SearchAppViewController class. So open the header file SearchAppViewController.h and add the following code:

UITableView *myTableView;

NSMutableArray *dataSource;     //will be storing all the data

NSMutableArray *tableData;     //will be storing data that will be displayed in table

NSMutableArray *searchedData;  //will be storing data matching with the search string

UISearchBar *sBar;  //search bar

@property(nonatomic,retain)NSMutableArray *dataSource;

.h file will look like this:

 #import <UIKit/UIKit.h>

 @class OverlayViewController;

 @interface RootViewController : UITableViewController

{

    NSMutableArray *Items;

    NSMutableArray *copyListOfItems;

    IBOutlet UISearchBar *searchBar;

    BOOL searching;

    BOOL letUserSelectRow;

    OverlayViewController *ovController;

}

- (void) searchTableView;

- (void) doneSearching_Clicked:(id)sender;

 @end

 .m file will look like this:

 

#import "RootViewController.h"

#import "SearchViewControllerAppDelegate.h"

#import "DetailViewController.h"

#import "OverlayViewController.h"

@implementation RootViewController

-   (void)viewDidLoad

{

    [super viewDidLoad];

    //Initialize the array.

    Items = [[NSMutableArray alloc] init];

    //Add items

    NSArray *countriesToLiveInArray = [NSArray arrayWithObjects:@"Pakistan", @"china", @"Srilanka", @"Swizerland", @"New Zealand", @"Green Land", @"Africa", @"Ireland",@"Canada",@"Japan",@"Afganistan", nil];

    NSDictionary *countriesToLiveInDict = [NSDictionary dictionaryWithObject:countriesToLiveInArray forKey:@"Countries"];

    NSArray *countriesLivedInArray = [NSArray arrayWithObjects:@"India", @"U.S.A",@"Nepal", nil];

    NSDictionary *countriesLivedInDict = [NSDictionary dictionaryWithObject:countriesLivedInArray forKey:@"Countries"];

    [Items addObject:countriesToLiveInDict];

    [Items addObject:countriesLivedInDict];   

    //Initialize the copy array.

    copyListOfItems = [[NSMutableArray alloc] init];

      // set the title

    self.navigationItem.title =@" Countries ";

    //Add the search bar

    self.tableView.tableHeaderView = searchBar;

    searchBar.autocorrectionType = UITextAutocorrectionTypeNo;

    searching = NO;

    letUserSelectRow = YES;

}

- (void)didReceiveMemoryWarning {

    // Releases the view if it doesn't have a superview.

    [super didReceiveMemoryWarning];  

}

#pragma mark Table view methods

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView

{

    if (searching)

      return 1;

    else

      return [Items count];

}

// Customize the number of rows in the table view.

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section

{

    if (searching)

      return [copyListOfItems count];                           //copyItems

    else {

        //Number of rows it should expect should be based on the section

        NSDictionary *dictionary = [Items objectAtIndex:section];

        NSArray *array = [dictionary objectForKey:@"Countries"];

      return [array count];

    }

}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {

    if(searching)

      return @"Search Results";

    if(section == 0)

      return @"Countries to visit";

    else

      return @"Countries visited";

}

- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index {

    if(searching)

      return -1;

    return index % 2;

}

// 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];

    }

    // Set up the cell...UITableView

    if(searching)

        cell.textLabel.text = [copyListOfItems objectAtIndex:indexPath.row];

    else {

    //First get the dictionary object

    NSDictionary *dictionary = [Items objectAtIndex:indexPath.section];

    NSArray *array = [dictionary objectForKey:@"Countries"];

    NSString *cellValue = [array objectAtIndex:indexPath.row];

    cell.textLabel.text = cellValue;

    }

    return cell;

}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    //Get the selected country

    NSString *selectedCountry = nil;

    if(searching)

        selectedCountry = [copyListOfItems objectAtIndex:indexPath.row];

    else

    {

    NSDictionary *dictionary = [Items objectAtIndex:indexPath.section];

    NSArray *array = [dictionary objectForKey:@"Countries"];

    selectedCountry = [array objectAtIndex:indexPath.row];

    }

    //Initialize the detail view controller and display it.

    DetailViewController *dvController = [[DetailViewController alloc] initWithNibName:@"DetailViewController" bundle:[NSBundle mainBundle]];

    dvController.selectedCountry = selectedCountry;

    [self.navigationController pushViewController:dvController animated:YES];

    [dvController release];

    dvController = nil;

}

- (NSIndexPath *)tableView :(UITableView *)theTableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    if(letUserSelectRow)

      return indexPath;

    else

      return nil;

}

- (UITableViewCellAccessoryType)tableView:(UITableView *)tableView accessoryTypeForRowWithIndexPath:(NSIndexPath *)indexPath

{

    return UITableViewCellAccessoryDisclosureIndicator;

}

- (void)tableView:(UITableView *)tableView accessoryButtonTappedForRowWithIndexPath:(NSIndexPath *)indexPath

{

    [self tableView:tableView didSelectRowAtIndexPath:indexPath];

}

- (void) searchBarTextDidBeginEditing:(UISearchBar *)theSearchBar {

    //This method is called again when the user clicks back from teh detail view.

    //So the overlay is displayed on the results, which is something we do not want to happen.

    if(searching)

        return;

    //Add the overlay view.

    if(ovController == nil)

        ovController = [[OverlayViewController alloc] initWithNibName:@"OverlayViewController" bundle:[NSBundle mainBundle]];

    CGFloat yaxis = self.navigationController.navigationBar.frame.size.height;

    CGFloat width = self.view.frame.size.width;

    CGFloat height = self.view.frame.size.height;

    //Parameters x = origion on x-axis, y = origon on y-axis.

    CGRect frame = CGRectMake(0, yaxis, width, height);

    ovController.view.frame = frame;   

    ovController.view.backgroundColor = [UIColor grayColor];

    ovController.view.alpha = 0.5;

    ovController.rvController = self;

    [self.tableView insertSubview:ovController.view aboveSubview:self.parentViewController.view];

    searching = YES;

    letUserSelectRow = NO;

    self.tableView.scrollEnabled = NO;

    //Add the done button.

    self.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc]

                                             initWithBarButtonSystemItem:UIBarButtonSystemItemDone

                                             target:self action:@selector(doneSearching_Clicked:)] autorelease];

}

- (void)searchBar:(UISearchBar *)theSearchBar textDidChange:(NSString *)searchText {

    //Remove all objects first.

    [copyListOfItems removeAllObjects];

    if([searchText length] > 0) {

        [ovController.view removeFromSuperview];

        searching = YES;

        letUserSelectRow = YES;

        self.tableView.scrollEnabled = YES;

      [self searchTableView];

    }

    else {

        [self.tableView insertSubview:ovController.view aboveSubview:self.parentViewController.view];

        searching = NO;

        letUserSelectRow = NO;

        self.tableView.scrollEnabled = NO;

    }

    [self.tableView reloadData];

}

- (void) searchBarSearchButtonClicked:(UISearchBar *)theSearchBar

{

    [self searchTableView];

}

- (void) searchTableView {

    NSString *searchText = searchBar.text;

    NSMutableArray *searchArray = [[NSMutableArray alloc] init];

    for (NSDictionary *dictionary in Items)

    {

        NSArray *array = [dictionary objectForKey:@"Countries"];

        [searchArray addObjectsFromArray:array];

    }

    for (NSString *sTemp in searchArray)

    {

        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];

    letUserSelectRow = YES;

    searching = NO;

    self.navigationItem.rightBarButtonItem = nil;

    self.tableView.scrollEnabled = YES;

    [ovController.view removeFromSuperview];

    [ovController release];

    ovController = nil;

    [self.tableView reloadData];

}

- (void)dealloc

{

    [ovController release];

    [copyListOfItems release];

    [searchBar release];

    [Items release];

    [super dealloc];

}

@end

Make connection in interface builder.

 

 

If you have any problem in doing this download the zip file from here

Download the Source Code

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Posted on: August 31, 2009

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