/*

 Copyright (C) 2018 Apple Inc. All Rights Reserved.

  See LICENSE.txt for this sample’s licensing information

  Abstract:

  The view controller for page three. 

 */

#import "ThreeViewController.h"

NSString *kBadgeValuePrefKey = @"kBadgeValue";  // badge value key for storing to NSUserDefaults

@interface ThreeViewController () <UITextFieldDelegate>

@property (nonatomic, strong) UIBarButtonItem *doneButton;

@property (nonatomic, weak) IBOutlet UITextField *badgeField;

- (void)doneAction:(id)sender;

@end

#pragma mark -

@implementation ThreeViewController

- (void)viewDidLoad

{

    [super viewDidLoad];

    // Set the badge value in our test field and tabbar item.

    NSString *badgeValue = [[NSUserDefaults standardUserDefaults] stringForKey:kBadgeValuePrefKey];

    _doneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(doneAction:)];

    if (badgeValue.length != 0)

    {

        self.badgeField.text = badgeValue;

        self.navigationController.tabBarItem.badgeValue = self.badgeField.text;

    }

}

- (void)doneAction:(id)sender

{

    // Dismiss the keyboard by resigning our badge edit field as first responder.

    [self.badgeField resignFirstResponder];

    // Set the badge value to our tab item (but only if a valid string).

    if (self.badgeField.text.length > 0)

    {

        // A value was entered, because we are inside a navigation controller,

        // we must access its tabBarItem to set the badgeValue.

        self.navigationController.tabBarItem.badgeValue = self.badgeField.text;

    }

    else

    {

        // No value was entered.

        self.navigationController.tabBarItem.badgeValue = nil;

    }

    [[NSUserDefaults standardUserDefaults] setValue:self.badgeField.text forKey:kBadgeValuePrefKey];

}

#pragma mark - UITextFieldDelegate

- (void)textFieldDidBeginEditing:(UITextField *)textField

{

    // user is starting to edit, add the done button to the navigation bar

    self.navigationItem.rightBarButtonItem = self.doneButton;

}

- (void)textFieldDidEndEditing:(UITextField *)textField

{

    /// user is done editing, remove the done button from the navigation bar

    self.navigationItem.rightBarButtonItem = nil;

}

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string

{

    BOOL result = YES;

    // restrict the maximum number of characters to 5

    if (textField.text.length == 5 && string.length > 0)

        result = NO;

    return result;

}

@end