Video Tutorial: Create a Tasks Application from the Ground Up – Part 3
In this tutorial we will be creating an application that manages tasks. The application will show you the MVC techniques for programming, how to make best use of Objective C features, as well as how to utilise storyboards to there full potential.
This is a four part tutorial, and in this part we are further implementing our AllTasks screen as well as adding the Add Task screen and fixing some bugs. Click that good old more link to watch this part, or click here to see all parts of this tutorial.
Code Listing
ICTasksBrain.m
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// // ICTasksBrain.m // Tasks // // Created by Matthew Casey on 06/02/2012. // Copyright (c) 2012 iOSConsultancy.co.uk. All rights reserved. // #import "ICTasksBrain.h" static ICTasksBrain *mainBrainObject = nil; @interface ICTasksBrain() @property (nonatomic, strong) NSMutableArray *tasks; @property (nonatomic, strong) NSMutableArray *activity; -(void)addActivityItem:(NSString *)aItem; @end @implementation ICTasksBrain @synthesize tasks = _tasks; -(NSMutableArray *)tasks { if (!_tasks) _tasks = [[NSMutableArray alloc] init]; return _tasks; } @synthesize activity = _activity; -(NSMutableArray *)activity { if (!_activity) _activity = [[NSMutableArray alloc] init]; return _activity; } -(void)addTask:(ICTask *)aTask { [self.tasks addObject:aTask]; [self addActivityItem:[NSString stringWithFormat:@"Added Task "%@"", aTask.taskTitle]]; } -(void)completeTask:(ICTask *)aTask { [self.tasks removeObject:aTask]; [self addActivityItem:[NSString stringWithFormat:@"Completed Task "%@"", aTask.taskTitle]]; } -(void)addActivityItem:(NSString *)aItem { [self.activity insertObject:aItem atIndex:0]; } -(NSArray *)allActivity { return [self.activity copy]; } -(NSArray *)allTasksWithPriority:(ICTaskPriority)aPriority { NSPredicate *filter = [NSPredicate predicateWithFormat:@"taskPriority == %i", aPriority]; return [self.tasks filteredArrayUsingPredicate:filter]; } +(ICTasksBrain *)mainBrain { @synchronized(self) { if (!mainBrainObject) { mainBrainObject = [[ICTasksBrain alloc] init]; } } return mainBrainObject; } @end |
ICTasksTableViewController.m
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// // ICTasksTableViewController.m // Tasks // // Created by Matthew Casey on 06/02/2012. // Copyright (c) 2012 iOSConsultancy.co.uk. All rights reserved. // #import "ICTasksTableViewController.h" #import "ICTasksBrain.h" @interface ICTasksTableViewController() @property (nonatomic, strong) NSArray *lowTasks; @property (nonatomic, strong) NSArray *mediumTasks; @property (nonatomic, strong) NSArray *highTasks; @end @implementation ICTasksTableViewController @synthesize lowTasks = _lowTasks; -(NSArray *)lowTasks { if (!_lowTasks) _lowTasks = [[ICTasksBrain mainBrain] allTasksWithPriority:ICTaskPriorityLow]; return _lowTasks; } @synthesize mediumTasks = _mediumTasks; -(NSArray *)mediumTasks { if (!_mediumTasks) _mediumTasks = [[ICTasksBrain mainBrain] allTasksWithPriority:ICTaskPriorityMedium]; return _mediumTasks; } @synthesize highTasks = _highTasks; -(NSArray *)highTasks { if (!_highTasks) _highTasks = [[ICTasksBrain mainBrain] allTasksWithPriority:ICTaskPriorityHigh]; return _highTasks; } - (id)initWithStyle:(UITableViewStyle)style { self = [super initWithStyle:style]; if (self) { // Custom initialization } return self; } - (void)didReceiveMemoryWarning { // Releases the view if it doesn't have a superview. [super didReceiveMemoryWarning]; // Release any cached data, images, etc that aren't in use. } #pragma mark - View lifecycle - (void)viewDidLoad { [super viewDidLoad]; // Uncomment the following line to preserve selection between presentations. // self.clearsSelectionOnViewWillAppear = NO; // Uncomment the following line to display an Edit button in the navigation bar for this view controller. // self.navigationItem.rightBarButtonItem = self.editButtonItem; } - (void)viewDidUnload { [super viewDidUnload]; // Release any retained subviews of the main view. // e.g. self.myOutlet = nil; } - (void)viewWillAppear:(BOOL)animated { self.lowTasks = nil; self.mediumTasks = nil; self.highTasks = nil; [self.tableView reloadData]; [super viewWillAppear:animated]; } - (void)viewDidAppear:(BOOL)animated { [super viewDidAppear:animated]; } - (void)viewWillDisappear:(BOOL)animated { [super viewWillDisappear:animated]; } - (void)viewDidDisappear:(BOOL)animated { [super viewDidDisappear:animated]; } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { // Return YES for supported orientations return (interfaceOrientation == UIInterfaceOrientationPortrait); } #pragma mark - Table view data source - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { // Return the number of sections. return 3; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { // Return the number of rows in the section. if (section == 0) { //low priority array return self.lowTasks.count; } else if (section == 1) { //medium priority array return self.mediumTasks.count; } else if (section == 2) { //high priorirty array return self.highTasks.count; } else { return 0; //this should never happen } } -(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section { if (section == 0) { return @"Low Priority"; } else if (section == 1) { return @"Medium Priority"; } else if (section == 2) { return @"High Priority"; } else { return nil; //this shoudl NEVER happen } } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { ICTask *ourTask = nil; UIColor *color = nil; if (indexPath.section == 0) { ourTask = [self.lowTasks objectAtIndex:indexPath.row]; color = [UIColor greenColor]; } else if (indexPath.section == 1) { ourTask = [self.mediumTasks objectAtIndex:indexPath.row]; color = [UIColor orangeColor]; } else if (indexPath.section == 2) { ourTask = [self.highTasks objectAtIndex:indexPath.row]; color = [UIColor redColor]; } UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"TaskCell"]; cell.textLabel.text = ourTask.taskTitle; cell.detailTextLabel.text = ourTask.taskDescription; UIView *priorityView = [[UIView alloc] initWithFrame:CGRectMake(cell.bounds.size.width - 20, 0, 20, cell.bounds.size.height)]; priorityView.backgroundColor = color; [cell addSubview:priorityView]; return cell; } /* // Override to support conditional editing of the table view. - (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath { // Return NO if you do not want the specified item to be editable. return YES; } */ -(NSString *)tableView:(UITableView *)tableView titleForDeleteConfirmationButtonForRowAtIndexPath:(NSIndexPath *)indexPath { return @"Complete"; } // Override to support editing the table view. - (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath { if (editingStyle == UITableViewCellEditingStyleDelete) { // Delete the row from the data source ICTask *taskToComplete = nil; if (indexPath.section == 0) { taskToComplete = [self.lowTasks objectAtIndex:indexPath.row]; self.lowTasks = nil; } else if (indexPath.section == 1) { taskToComplete = [self.mediumTasks objectAtIndex:indexPath.row]; self.mediumTasks = nil; } else if (indexPath.section == 2) { taskToComplete = [self.highTasks objectAtIndex:indexPath.row]; self.highTasks = nil; } [[ICTasksBrain mainBrain] completeTask:taskToComplete]; [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade]; } else if (editingStyle == UITableViewCellEditingStyleInsert) { // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view } } /* // Override to support rearranging the table view. - (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath { } */ /* // Override to support conditional rearranging of the table view. - (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath { // Return NO if you do not want the item to be re-orderable. return YES; } */ #pragma mark - Table view delegate - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { } @end |
ICActivityTableViewController.m
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// // ICActivityTableViewController.m // Tasks // // Created by Matthew Casey on 06/02/2012. // Copyright (c) 2012 iOSConsultancy.co.uk. All rights reserved. // #import "ICActivityTableViewController.h" #import "ICTasksBrain.h" @interface ICActivityTableViewController() @property (nonatomic, strong) NSArray *activity; @end @implementation ICActivityTableViewController @synthesize activity = _activity; -(NSArray *)activity { if (!_activity) _activity = [[ICTasksBrain mainBrain] allActivity]; return _activity; } - (id)initWithStyle:(UITableViewStyle)style { self = [super initWithStyle:style]; if (self) { // Custom initialization } return self; } - (void)didReceiveMemoryWarning { // Releases the view if it doesn't have a superview. [super didReceiveMemoryWarning]; // Release any cached data, images, etc that aren't in use. } #pragma mark - View lifecycle - (void)viewDidLoad { [super viewDidLoad]; // Uncomment the following line to preserve selection between presentations. // self.clearsSelectionOnViewWillAppear = NO; // Uncomment the following line to display an Edit button in the navigation bar for this view controller. // self.navigationItem.rightBarButtonItem = self.editButtonItem; } - (void)viewDidUnload { [super viewDidUnload]; // Release any retained subviews of the main view. // e.g. self.myOutlet = nil; } - (void)viewWillAppear:(BOOL)animated { self.activity = nil; [self.tableView reloadData]; [super viewWillAppear:animated]; } - (void)viewDidAppear:(BOOL)animated { [super viewDidAppear:animated]; } - (void)viewWillDisappear:(BOOL)animated { [super viewWillDisappear:animated]; } - (void)viewDidDisappear:(BOOL)animated { [super viewDidDisappear:animated]; } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { // Return YES for supported orientations return (interfaceOrientation == UIInterfaceOrientationPortrait); } #pragma mark - Table view data source - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { // Return the number of sections. return 1; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { // Return the number of rows in the section. return self.activity.count; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"ActivityCell"]; cell.textLabel.text = [self.activity objectAtIndex:indexPath.row]; return cell; } /* // Override to support conditional editing of the table view. - (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath { // Return NO if you do not want the specified item to be editable. return YES; } */ /* // Override to support editing the table view. - (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath { if (editingStyle == UITableViewCellEditingStyleDelete) { // Delete the row from the data source [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade]; } else if (editingStyle == UITableViewCellEditingStyleInsert) { // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view } } */ /* // Override to support rearranging the table view. - (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath { } */ /* // Override to support conditional rearranging of the table view. - (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath { // Return NO if you do not want the item to be re-orderable. return YES; } */ #pragma mark - Table view delegate - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { } @end |
ICAddTaskTableViewController.h
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// // ICAddTaskTableViewController.h // Tasks // // Created by Matthew Casey on 07/02/2012. // Copyright (c) 2012 iOSConsultancy.co.uk. All rights reserved. // #import #import "ICTasksBrain.h" @interface ICAddTaskTableViewController : UITableViewController @property (nonatomic) ICTaskPriority taskPriority; @property (weak, nonatomic) IBOutlet UITextField *txtTitle; @property (weak, nonatomic) IBOutlet UITextView *txtDescription; - (IBAction)doneTapped:(id)sender; - (IBAction)cancelTapped:(id)sender; @end |
ICAddTaskTableViewController.m
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// // ICAddTaskTableViewController.m // Tasks // // Created by Matthew Casey on 07/02/2012. // Copyright (c) 2012 iOSConsultancy.co.uk. All rights reserved. // #import "ICAddTaskTableViewController.h" @implementation ICAddTaskTableViewController @synthesize taskPriority = _taskPriority; @synthesize txtTitle = _txtTitle; @synthesize txtDescription = _txtDescription; - (id)initWithStyle:(UITableViewStyle)style { self = [super initWithStyle:style]; if (self) { // Custom initialization } return self; } - (void)didReceiveMemoryWarning { // Releases the view if it doesn't have a superview. [super didReceiveMemoryWarning]; // Release any cached data, images, etc that aren't in use. } #pragma mark - View lifecycle - (void)viewDidLoad { [super viewDidLoad]; // Uncomment the following line to preserve selection between presentations. // self.clearsSelectionOnViewWillAppear = NO; // Uncomment the following line to display an Edit button in the navigation bar for this view controller. // self.navigationItem.rightBarButtonItem = self.editButtonItem; } - (void)viewDidUnload { [self setTxtTitle:nil]; [self setTxtDescription:nil]; [super viewDidUnload]; // Release any retained subviews of the main view. // e.g. self.myOutlet = nil; } - (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; } - (void)viewDidAppear:(BOOL)animated { [super viewDidAppear:animated]; } - (void)viewWillDisappear:(BOOL)animated { [super viewWillDisappear:animated]; } - (void)viewDidDisappear:(BOOL)animated { [super viewDidDisappear:animated]; } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { // Return YES for supported orientations return (interfaceOrientation == UIInterfaceOrientationPortrait); } #pragma mark - Table view delegate -(NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath { if (indexPath.section == 0) { return nil; } else { return indexPath; } } - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { self.taskPriority = indexPath.row; UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath]; cell.accessoryType = UITableViewCellAccessoryCheckmark; int i; for (i=0; i NSIndexPath *tempIP = [NSIndexPath indexPathForRow:i inSection:indexPath.section]; UITableViewCell *tempCell = [tableView cellForRowAtIndexPath:tempIP]; if (![tempCell isEqual:cell]) { tempCell.accessoryType = UITableViewCellAccessoryNone; } } [tableView deselectRowAtIndexPath:indexPath animated:YES]; } - (IBAction)doneTapped:(id)sender { ICTask *newTask = [[ICTask alloc] init]; newTask.taskTitle = self.txtTitle.text; newTask.taskDescription = self.txtDescription.text; newTask.taskPriority = self.taskPriority;//wher does this come from? [[ICTasksBrain mainBrain] addTask:newTask]; [self.parentViewController dismissModalViewControllerAnimated:YES]; } - (IBAction)cancelTapped:(id)sender { [self.parentViewController dismissModalViewControllerAnimated:YES]; } @end |
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