/*

 Copyright (C) 2017 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 Demonstrates using a custom back button image with no chevron and no text.

 */

#import "CustomBackButtonViewController.h"

#import "NavBar-Swift.h"

@interface CustomBackButtonViewController ()

/// Our data source is an array of city names, populated from Cities.json.

@property (nonatomic, strong) CitiesDataSource *dataSource;

@end

#pragma mark -

@implementation CustomBackButtonViewController

- (void)viewDidLoad

{

    [super viewDidLoad];

    _dataSource = [[CitiesDataSource alloc] init];

    self.tableView.dataSource = self.dataSource;

    // Note that images configured as the back bar button's background do

    // not have the current tintColor applied to them, they are displayed as it.

    UIImage *backButtonBackgroundImage = [UIImage imageNamed:@"Menu"];

    // The background should be pinned to the left and not stretch.

    backButtonBackgroundImage =

        [backButtonBackgroundImage resizableImageWithCapInsets:UIEdgeInsetsMake(0, backButtonBackgroundImage.size.width - 1, 0, 0)];

    id barAppearance =

        [UINavigationBar appearanceWhenContainedInInstancesOfClasses:@[[CustomBackButtonNavController class]]];

    [barAppearance setBackIndicatorImage:backButtonBackgroundImage];

    [barAppearance setBackIndicatorTransitionMaskImage:backButtonBackgroundImage];

    // Provide an empty backBarButton to hide the 'Back' text present by

    // default in the back button.

    //

    // NOTE: You do not need to provide a target or action.  These are set

    //       by the navigation bar.

    // NOTE: Setting the title of this bar button item to ' ' (space) works

    //       around a bug in iOS 7.0.x where the background image would be

    //       horizontally compressed if the back button title is empty.

    UIBarButtonItem *backBarButton = [[UIBarButtonItem alloc] initWithTitle:@" "

                                                                      style:UIBarButtonItemStylePlain

                                                                     target:nil

                                                                     action:nil];

    self.navigationItem.backBarButtonItem = backBarButton;

}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender

{

    NSString *city = [self.dataSource cityWithIndex:self.tableView.indexPathForSelectedRow.row];

    if ([segue.identifier isEqualToString:@"DetailSegue"])

    {

        [(CustomBackButtonDetailViewController *)segue.destinationViewController setCity:city];

    }

}

@end