Produced by. Design Patterns. MSc in Computer Science. Eamonn de Leastar

Transcription

1 Design Patterns MSc in Computer Science Produced by Eamonn de Leastar Department of Computing, Maths & Physics Waterford Institute of Technology

2 Todo App

3 developer.apple.com Start Developing ios Apps Today Objective-C only

4

5

6 ToDoList Applications 8 source files 5 source files

7 AppDelegate #import AppDelegate : UIResponder (strong, nonatomic) UIWindow *window; import class AppDelegate: UIResponder, UIApplicationDelegate var window: UIWindow? #import AppDelegate - (BOOL)application:(UIApplication *)application - didfinishlaunchingwithoptions:(nsdictionary *)launchoptions return YES; - (void)applicationwillresignactive:(uiapplication *)application - (void)applicationdidenterbackground:(uiapplication *)application - (void)applicationwillenterforeground:(uiapplication *)application - (void)applicationdidbecomeactive:(uiapplication *)application - (void)applicationwillterminate:(uiapplication *)application func application(application: UIApplication, didfinishlaunchingwithoptions: NSDictionary?) -> Boo return true func applicationwillresignactive(application: UIApplication) func applicationdidenterbackground(application: UIApplication) func applicationwillenterforeground(application: UIApplication) func applicationdidbecomeactive(application: UIApplication) func applicationwillterminate(application: UIApplication)

8 #import XYZToDoItem : NSObject NSString BOOL completed; The Model #import XYZToDoItem - (id)init self = [super init]; if (self) _completed = NO; return self; - (id)initwithcoder:(nscoder *)coder self = [super init]; if (self) _itemname = [coder decodeobjectforkey:@"itemname"]; _completed = [coder decodeboolforkey:@"completed"]; class ToDoItem var completed = false var itemname = "" init(completed: Bool = false, itemname:string = "empty") self.completed = completed self.itemname = itemname return self; - (void)encodewithcoder:(nscoder *)coder [coder encodeobject:self.itemname forkey:@"itemname"]; [coder encodebool:self.completed forkey:@"completed"];

9 #import <UIKit/UIKit.h> #import XYZAddToDoItemViewController : XYZToDoItem *todoitem; ToDoItemController #import XYZAddToDoItemViewController (weak, nonatomic) IBOutlet UITextField (weak, nonatomic) IBOutlet UIBarButtonItem XYZAddToDoItemViewController - (void) prepareforsegue:(uistoryboardsegue *)segue sender:(id)sender if (sender = self.donebutton) return; if (self.textfield.text.length > 0) self.todoitem = [[XYZToDoItem alloc] init]; self.todoitem.itemname = self.textfield.text; - (id)initwithnibname:(nsstring *)nibnameornil bundle:(nsbundle *)nibbundleornil self = [super initwithnibname:nibnameornil bundle:nibbundleornil]; if (self) return self; - (void)viewdidload [super viewdidload]; - (void)didreceivememorywarning [super didreceivememorywarning];

10 ToDoItemController import UIKit class AddToDoItemViewController: UIViewController var todoitem : var todoitemtext : var donebutton : UIButton init(nibname nibnameornil: String?, bundle nibbundleornil: NSBundle?) super.init(nibname: nibnameornil, bundle: nibbundleornil) override func prepareforsegue(segue: UIStoryboardSegue, sender: AnyObject) if let button = sender as? NSObject todoitem = button == donebutton? ToDoItem(itemName:toDoItemText.text): nil init(coder adecoder: NSCoder) super.init(coder: adecoder)

11 #import XYZToDoListViewController : NSMutableArray *todoitems; ToDoListTableConroller #import "XYZToDoListViewController.h" #import "XYZToDoItem.h" #import "XYZAddToDoItemViewController.h" - XYZToDoListViewController () self = [super NSString *path; if (self) - (NSInteger)tableView:(UITableView *)tableview numberofrowsinsection:(nsinteger)section return XYZToDoListViewController return [self.todoitems count]; - (void)savelist - (void)viewdidload [NSKeyedArchiver archiverootobject:self.todoitems [super viewdidload]; tofile:self.path]; - (void)didreceivememorywarning return cell; - (IBAction)unwindToList:(UIStoryboardSegue [super didreceivememorywarning]; *)segue - (UITableViewCell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpat self.path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, static NSString *CellIdentifier - (void)tableview:(uitableview *)tableview commiteditingstyle:(uitableview NSUserDomainMask, YES) lastobject]; - (void)loadinitialdata self.path = [self.path UITableViewCell stringbyappendingpathcomponent:@"todolist.txt"]; *cell = [tableview *)indexpath dequeuereusablecellwithidentifier:cellidentifier forindexpath:in XYZToDoItem *item1 NSFileManager = [[XYZToDoItem *filemanager XYZToDoItem alloc] init]; = [NSFileManager *todoitem defaultmanager]; = [self.todoitems if (editingstyle objectatindex:indexpath.row]; == UITableViewCellEditingStyleDelete) item1.itemname if ([filemanager milk"; fileexistsatpath:self.path]) cell.textlabel.text = todoitem.itemname; [self.todoitems removeobjectatindex:indexpath.row]; [self.todoitems addobject:item1]; self.todoitems = [[NSMutableArray if (todoitem.completed) [self savelist]; alloc] init]; XYZToDoItem *item2 = [[XYZToDoItem alloc] init]; item2.itemname else cell.accessorytype = UITableViewCellAccessoryCheckmark; [tableview deleterowsatindexpaths:@[indexpath] withrowanimation:uitabl eggs"; [self.todoitems addobject:item2]; self.todoitems = [[NSKeyedUnarchiver else else if (editingstyle == UITableViewCellEditingStyleInsert) unarchiveobjectwithfile:self.path] mutablecopy]; XYZToDoItem *item3 = [[XYZToDoItem alloc] init]; cell.accessorytype = UITableViewCellAccessoryNone; item3.itemname self.navigationitem.leftbarbuttonitem a book"; = self.editbuttonitem; [self.todoitems addobject:item3]; - (void)tableview:(uitableview *)tableview moverowatindexpath:(nsindexpath - (BOOL)tableView:(UITableView - (BOOL)tableView:(UITableView *)tableview caneditrowatindexpath:(nsindexpath *)tableview canmoverowatindexpath:(nsindexp *)indexpath XYZAddToDoItemViewController *source = [segue sourceviewcontroller]; XYZToDoItem *item #pragma = source.todoitem; mark - Table view data source if (item = nil) return YES; return YES; - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableview [self.todoitems addobject:item]; [self savelist]; return 1; - (void)tableview:(uitableview *)tableview commiteditingstyle:(uitableviewcelleditingstyle)editingsty [self.tableview *)indexpath #pragma mark - Navigation reloaddata]; - (NSInteger)tableView:(UITableView if (editingstyle *)tableview == UITableViewCellEditingStyleDelete) numberofrowsinsection:(nsinteger)section - (void)tableview:(uitableview *)tableview didselectrowatindexpath:(nsinde return [self.todoitems count]; [self.todoitems removeobjectatindex:indexpath.row]; [self savelist]; [tableview deselectrowatindexpath:indexpath animated:no];

12 import class ToDoListTableViewController: UITableViewController var todoitems = ToDoItem[]() init(style: UITableViewStyle) super.init(style: style) init(coder adecoder: NSCoder) super.init(coder: adecoder) override func tableview(tableview: UITableView, didselectrowatindexpath : NSIndexPath) tableview.deselectrowatindexpath(didselectrowatindexpath, animated: false) var task = self.todoitems[didselectrowatindexpath.row] as ToDoItem task.completed = task.completed tableview.reloadrowsatindexpaths([didselectrowatindexpath], withrowanimation: UITableVie override func tableview(tableview: UITableView?, cellforrowatindexpath : NSIndexPath) -> let cell = UITableViewCell(style: UITableViewCellStyle.Default, reuseidentifie func loadinitialdata() var task = todoitems[cellforrowatindexpath.row] todoitems.append(todoitem(itemname:"buy Milk", cell.text completed:false)) = task.itemname todoitems.append(todoitem(itemname:"buy eggs", cell.accessorytype completed:false)) = task.completed? UITableViewCellAccessoryType.Checkmark : UITableVi todoitems.append(todoitem(itemname:"read a book", completed:false)) return cell override func viewdidload() super.viewdidload() loadinitialdata() override func tableview(tableview: UITableView?, caneditrowatindexpath : NSIndexPath?) -> return true navigationitem.leftbarbuttonitem = self.editbuttonitem() override func unwindtolist (segue: UIStoryboardSegue?) if commiteditingstyle ==.Delete var controller = segue?.sourceviewcontroller as AddToDoItemViewController if controller.todoitem = nil if let index = forrowatindexpath?.row todoitems.append(controller.todoitem) todoitems.removeatindex(index) self.tableview.reloaddata() tableview?.deleterowsatindexpaths([forrowatindexpath], withrowanimation:.fade) else if commiteditingstyle ==.Insert override func numberofsectionsintableview(tableview: UITableView?) -> Int return 1 override func tableview(tableview: UITableView?, moverowatindexpath : NSIndexPath?, toinde override func tableview(tableview: UITableView?, numberofrowsinsection: Int) -> Int return todoitems.count ToDoListTableConroller override func tableview(tableview: UITableView?, canmoverowatindexpath : NSIndexPath?) -> return true

13 KLocs Objctive-C Swift AppDelegate.h 7 AppDelegate.m 30 AppDelegate.swift 33 ToDoItem.h 8 ToDoItem.m 33 ToDoItem.swift 12 ToDoItemController.h 8 ToDoItemController.m 41 ToDoItemController.swift 27 ToDiListController.h 7 ToDiListController.m 156 ToDoListController.swift

14 Except where otherwise noted, this content is licensed under a Creative Commons Attribution-NonCommercial 3.0 License. For more information, please see creativecommons.org/licenses/by-nc/3.0/