Not working - No entry into the array list


#1

[code]//
// BNRAppDelegate.h
// iTahDoodle
//
// Created by Hanish Garg on 8/24/14.
// Copyright © 2014 Big Nerd Ranch. All rights reserved.
//

#import <UIKit/UIKit.h>

NSString *BNRDocPath(void);

@interface BNRAppDelegate : UIResponder <UIApplicationDelegate, UITableViewDataSource>

@property (strong, nonatomic) UIWindow *window;
@property (nonatomic) UITableView *taskTable;
@property (nonatomic) UITextField *taskField;
@property (nonatomic) UIButton *insertButton;

@property (nonatomic) NSMutableArray *tasks;

  • (void) addTask:(id)sender;

@end
[/code]

//
//  BNRAppDelegate.m
//  iTahDoodle
//
//  Created by Hanish Garg on 8/24/14.
//  Copyright (c) 2014 Big Nerd Ranch. All rights reserved.
//

#import "BNRAppDelegate.h"


// Helper function to fetch the path to our to-do data stored on disk
NSString *BNRDocPath()
{
    NSArray *pathList = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
                                                            NSUserDomainMask,
                                                            YES);
    return [pathList[0] stringByAppendingPathComponent:@"data.td"];
}

@implementation BNRAppDelegate

#pragma mark - Application delegate callbacks



- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    
    
    // Create an empty array to get us started
  //self.tasks = [NSMutableArray array];
    
    NSArray *plist = [NSArray arrayWithContentsOfFile:BNRDocPath()];
    if (plist) {
        // We have a dataset; copy it into tasks
        self.tasks = [plist mutableCopy];
    } else {
        // There is no dataset; create an empty array
        self.tasks = [NSMutableArray array];
    }
    
    // Create and configure the UIWindow instance
    // A CGRect is a struct with an origin (x,y) and a size (width,height)
    CGRect winFrame = [[UIScreen mainScreen] bounds];
    UIWindow *theWindow = [[UIWindow alloc] initWithFrame];
    self.window = theWindow;
    
    // Define the frame rectangles of the three UI elements
    // CGRectMake() creates a CGRect from (x, y, width, height)
    CGRect tableFrame = CGRectMake(0, 80, winFrame.size.width,
                                   winFrame.size.height - 100);
    
    CGRect fieldFrame = CGRectMake(20, 40, 200, 31);
    CGRect buttonFrame = CGRectMake(228, 40, 72, 31);
    
    // Create and configure the UITableView instance
    self.taskTable = [[UITableView alloc] initWithFrame:tableFrame style:UITableViewStylePlain];
    self.taskTable.separatorStyle = UITableViewCellSeparatorStyleNone;

    self.taskTable.dataSource = self;
    
    // Tell the table view which class to instantiate whenever it
    // needs to create a new cell
    [self.taskTable registerClass:[UITableViewCell class]
           forCellReuseIdentifier:@"Cell"];
    
    // Create and configure the UITextField instance where new tasks will be entered
    self.taskField = [[UITextField alloc] initWithFrame:fieldFrame];
    self.taskField.borderStyle = UITextBorderStyleRoundedRect;
    self.taskField.placeholder = @"Type a task, tap Insert";
    
    // Create and configure the UIButton instance
    self.insertButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    self.insertButton.frame = buttonFrame;
    
    // Give the button a title
    [self.insertButton setTitle:@"Insert" forState:UIControlStateNormal];

    [self.insertButton addTarget:self action:@selector(addTask:) forControlEvents:UIControlEventTouchDragInside];
    // Add our three UI elements to the window
    [self.window addSubview:self.taskTable];
    [self.window addSubview:self.taskField];
    [self.window addSubview:self.insertButton];
    
    // Finalize the window and put it on the screen
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    
    return YES;
    
    
     
}

- (void)applicationWillResignActive:(UIApplication *)application
{
    // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
    // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
}

- (void)applicationDidEnterBackground:(UIApplication *)application
{
    // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later. 
    // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
    
    [self.tasks writeToFile:BNRDocPath() atomically:YES];
}

- (void)applicationWillEnterForeground:(UIApplication *)application
{
    // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
}

- (void)applicationDidBecomeActive:(UIApplication *)application
{
    // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}

- (void)applicationWillTerminate:(UIApplication *)application
{
    // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}

#pragma mark - Actions

- (void) addTask:(id)sender
{
    NSString *text = [self.taskField text];
    
    if ([text length] == 0) {
        return;
    }
    
   // NSLog(@"Text entered is : %@", text);
    
    [self.tasks addObject:text];
    [self.taskTable reloadData];
    [self.taskField setText:@" "];
    
    [self.taskField resignFirstResponder];
}




#pragma mark - Table view management

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // Because this table view only has one section,
    // the number of rows in it is equal to the number
    // of items in the tasks array
    return [self.tasks count];
}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    // To improve performance, this method first checks
    // for an existing cell object that we can reuse
    // If there isn't one, then a new cell is created
    UITableViewCell *c = [self.taskTable dequeueReusableCellWithIdentifier:@"Cell"];
    
    // Then we (re)configure the cell based on the model object,
    // in this case the tasks array, ...
    NSString *item = [self.tasks objectAtIndex:indexPath.row];
    c.textLabel.text = item;
    
    // ... and hand the properly configured cell back to the table view
    return c;
}


@end


#2

How do you know there’s no entry into the array list? Are you saying it doesn’t get added to the “tasks” array? or just that nothing is appearing on the screen?

I’d try troubleshooting by NSLog inserts after [self.tasks addObject:text] and other lines of code to pinpoint your issue.