/*

 Copyright (C) 2014 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

  The main UIViewController containing the app's user interface.

 */

#import "RootViewController.h"

// The value for the 'Text Color' setting is stored as an integer between

// one and three inclusive.  This enumeration provides a mapping between

// the integer value, and color.

typedef NS_ENUM(NSUInteger, TextColor) {

    blue = 1,

    red,

    green

};

// It's best practice to define constant strings for each preference's key.

// These constants should be defined in a location that is visible to all

// source files that will be accessing the preferences.

NSString* const kFirstNameKey           = @"firstNameKey";

NSString* const kLastNameKey            = @"lastNameKey";

NSString* const kNameColorKey           = @"nameColorKey";

@interface RootViewController ()

// Values from the app's preferences

@property (strong) NSString *firstName;

@property (strong) NSString *lastName;

@property (strong) UIColor *nameColor;

@end

@implementation RootViewController

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

- (void)viewDidLoad

{

    [super viewDidLoad];

    // Only iOS 8 and above supports the UIApplicationOpenSettingsURLString

    // used to launch the Settings app from your application.  If the

    // UIApplicationOpenSettingsURLString is not present, we're running on an

    // old version of iOS.  Remove the Settings button from the navigation bar

    // since it won't be able to do anything.

    if (&UIApplicationOpenSettingsURLString == NULL) {

        self.navigationItem.leftBarButtonItem = nil;

    }

}

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

- (void)viewWillAppear:(BOOL)animated

{

    [super viewWillAppear:animated];

    // Load our preferences.  Preloading the relevant preferences here will

    // prevent possible diskIO latency from stalling our code in more time

    // critical areas, such as tableView:cellForRowAtIndexPath:, where the

    // values associated with these preferences are actually needed.

    [self onDefaultsChanged:nil];

    // Begin listening for changes to our preferences when the Settings app does

    // so, when we are resumed from the backround, this will give us a chance to

    // update our UI

    [[NSNotificationCenter defaultCenter] addObserver:self

                                             selector:@selector(onDefaultsChanged:)

                                                 name:NSUserDefaultsDidChangeNotification

                                               object:nil];

}

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

- (void)viewWillDisappear:(BOOL)animated

{

    [super viewWillDisappear:animated];

    // Stop listening for the NSUserDefaultsDidChangeNotification

    [[NSNotificationCenter defaultCenter] removeObserver:self name:NSUserDefaultsDidChangeNotification object:nil];

}

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

//! Unwind action for the Done button on the Info screen.

//

- (IBAction)unwindFromInfoScreen:(UIStoryboardSegue *)sender

{ }

#pragma mark -

#pragma mark Preferences

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

//! Launches the Settings app.  The Settings app will automatically navigate to

//! to the settings page for this app.

//

- (IBAction)openApplicationSettings:(id)sender

{

    // UIApplicationOpenSettingsURLString is only availiable in iOS 8 and above.

    // The following code will crash if run on a prior version of iOS.  See the

    // check in -viewDidLoad.

    [[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];

}

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

//  Handler for the NSUserDefaultsDidChangeNotification.  Loads the preferences

//  from the defaults database into the holding properies, then asks the

//  tableView to reload itself.

//

- (void)onDefaultsChanged:(NSNotification *)aNotification

{

    NSUserDefaults *standardDefaults = [NSUserDefaults standardUserDefaults];

    self.firstName = [standardDefaults objectForKey:kFirstNameKey];

    self.lastName = [standardDefaults objectForKey:kLastNameKey];

    // The value for the 'Text Color' setting is stored as an integer between

    // one and three inclusive.  Convert the integer into a UIColor object.

    TextColor textColor = [standardDefaults integerForKey:kNameColorKey];

    switch (textColor) {

        case blue:

            self.nameColor = [UIColor blueColor];

            break;

        case red:

            self.nameColor = [UIColor redColor];

            break;

        case green:

            self.nameColor = [UIColor greenColor];

            break;

        default:

            NSAssert(NO, @"Got an unexpected value %@ for %@", @(textColor), kNameColorKey);

    }

    [self.tableView reloadData];

}

#pragma mark -

#pragma mark UITableViewDataSource

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

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

{

    return 1;

}

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

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

{

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

    cell.textLabel.text = [NSString stringWithFormat:@"%@ %@", self.firstName, self.lastName];

    cell.textLabel.textColor = self.nameColor;

    return cell;

}

@end