Task.h

#import <UIKit/UIKit.h>

@class Task;

@interface TaskDurationViewController : UIViewController <UIPickerViewDataSource, UIPickerViewDelegate>

@property (strong, nonatomic) Task *task;

@property (strong, nonatomic) IBOutlet UILabel *pomodoroLabel;
@property (strong, nonatomic) IBOutlet UILabel *minuteLabel;
@property (strong, nonatomic) IBOutlet UIPickerView *durationPicker;

@end

Task.m

#import "TaskDurationViewController.h"
#import "Task.h"

@implementation TaskDurationViewController

@synthesize task = _task;
@synthesize pomodoroLabel = _pomodoroLabel;
@synthesize minuteLabel = _minuteLabel;
@synthesize durationPicker = _durationPicker;

#pragma mark - View lifecycle

- (void)loadView
{
    [super loadView];
    
    [self.durationPicker selectRow:((int)self.task.duration - 1) inComponent:0 animated:NO];
    self.pomodoroLabel.text = self.task.durationString;
    self.minuteLabel.text = self.task.minutesString;
}

/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
    [super viewDidLoad];
}
*/

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

# pragma mark - Picker data source

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 1;
}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    return 99;
}

# pragma mark - Picker delegate

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    if (row == 0) {
        return @"1 Pomodoro";
    } else {
        return [NSString stringWithFormat:@"%d Pomodoros", row + 1];
    }
}

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    [self.task setValue:[NSNumber numberWithInt:1] forKey:@"duration"];
    self.pomodoroLabel.text = self.task.durationString;
    self.minuteLabel.text = @"Foo";
    NSLog(@"Row selected:%d, Duration: %@", row, self.task.duration);
}

@end