/*

 Copyright (C) 2015 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

  not text.

 */

#import "CustomBackButtonViewController.h"

#import "CustomBackButtonNavController.h"

#import "CustomBackButtonDetailViewController.h"

@interface CustomBackButtonViewController ()

//! An array of city names, populated from Cities.json.

@property (nonatomic, strong) NSArray *cities;

@end

@implementation CustomBackButtonViewController

//| ----------------------------------------------------------------------------

- (void)viewDidLoad

{

    [super viewDidLoad];

    // Load some data to populate the table view with

    NSURL *citiesJSONURL = [[NSBundle mainBundle] URLForResource:@"Cities" withExtension:@"json"];

    NSData *citiesJSONData = [NSData dataWithContentsOfURL:citiesJSONURL];

    self.cities = [NSJSONSerialization JSONObjectWithData:citiesJSONData options:0 error:NULL];

    // 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 appearance = [UIBarButtonItem appearanceWhenContainedIn:[CustomBackButtonNavController class], nil];

    [appearance setBackButtonBackgroundImage:backButtonBackgroundImage forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];

    // 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:NULL];

    self.navigationItem.backBarButtonItem = backBarButton;

    // NOTE: There is a bug in iOS 7.0.x where the background of the back bar

    //       button item will not appear until the back button has been tapped

    //       once.

}

//| ----------------------------------------------------------------------------

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

{

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

        [(CustomBackButtonDetailViewController*)segue.destinationViewController setCity:self.cities[self.tableView.indexPathForSelectedRow.row]];

}

#pragma mark -

#pragma mark UITableViewDataSource

//| ----------------------------------------------------------------------------

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section

{

    return self.cities.count;

}

//| ----------------------------------------------------------------------------

- (UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

{

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell"];

    cell.textLabel.text = self.cities[indexPath.row];

    return cell;

}

@end