programmatically_screen.m

    //create and configure the UI windows view instances
    CGRect winFrame = [[UIScreen mainScreen] bounds];
    
    UIWindow *theWindow = [[UIWindow alloc] initWithFrame:winFrame];
    
    self.window = theWindow;
    

    
    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);
    
    self.taskTable = [[UITableView alloc] initWithFrame:tableframe style:UITableViewStylePlain];
    
    self.taskTable.separatorStyle = UITableViewCellSeparatorStyleNone;
    
    [self.taskTable registerClass:[UITableViewCell class] forCellReuseIdentifier:@"Cell"];
    
    self.taskField = [[UITextField alloc] initWithFrame:fieldFrame];
    
    self.taskField.borderStyle = UITextBorderStyleRoundedRect;
    
    self.taskField.placeholder = @"type a task, tap insert";
    
    //create and configure a uibutton instance
    
    self.insertButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    self.insertButton.frame = buttonFrame;
    
    [self.insertButton setTitle:@"Insert" forState:UIControlStateNormal ];
    
    
    [self.window addSubview:self.taskTable];
    [self.window addSubview:self.taskField];
    [self.window addSubview:self.insertButton];
    
    self.window.backgroundColor = [UIColor whiteColor];
    
    [self.window makeKeyAndVisible];