/*

Copyright (C) 2015 Apple Inc. All Rights Reserved.

See LICENSE.txt for this sample’s licensing information

Abstract:

A container view controller that manages an ADBannerView and a content view controller.

*/

@import iAd;

#import "BannerViewController.h"

NSString * const BannerViewActionWillBegin = @"BannerViewActionWillBegin";

NSString * const BannerViewActionDidFinish = @"BannerViewActionDidFinish";

@interface BannerViewManager : NSObject <ADBannerViewDelegate>

@property (nonatomic, readonly) ADBannerView *bannerView;

+ (BannerViewManager *)sharedInstance;

- (void)addBannerViewController:(BannerViewController *)controller;

- (void)removeBannerViewController:(BannerViewController *)controller;

@end

#pragma mark -

@interface BannerViewController ()

@property (nonatomic, strong) UIViewController *contentController;

@end

#pragma mark -

@implementation BannerViewController

- (void)dealloc

{

    [[BannerViewManager sharedInstance] removeBannerViewController:self];

}

- (void)viewDidLoad

{

    [super viewDidLoad];

    [[BannerViewManager sharedInstance] addBannerViewController:self];

    NSArray *children = self.childViewControllers;

    assert(children != nil);    // must have children

    // keep track of our child view controller for rotation and frame management

    _contentController = children[0];

}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation

{

    return [self.contentController preferredInterfaceOrientationForPresentation];

}

- (void)viewDidLayoutSubviews

{

    [super viewDidLayoutSubviews];

    CGRect contentFrame = self.view.bounds, bannerFrame = CGRectZero;

    ADBannerView *bannerView = [BannerViewManager sharedInstance].bannerView;

    // If configured to support iOS >= 6.0 only, then we want to avoid

    // currentContentSizeIdentifier as it is deprecated.

    // Fortunately all we need to do is ask the banner for a size that fits into the layout

    // area we are using. At this point in this method contentFrame=self.view.bounds,

    // so we'll use that size for the layout.

    //

    bannerFrame.size = [bannerView sizeThatFits:contentFrame.size];

    if (bannerView.bannerLoaded) {

        contentFrame.size.height -= bannerFrame.size.height;

        bannerFrame.origin.y = contentFrame.size.height;

    } else {

        bannerFrame.origin.y = contentFrame.size.height;

    }

    self.contentController.view.frame = contentFrame;

    // We only want to modify the banner view itself if this view controller is actually

    // visible to the user. This prevents us from modifying it while it is being displayed elsewhere.

    //

    if (self.isViewLoaded && (self.view.window != nil)) {

        [self.view addSubview:bannerView];

        bannerView.frame = bannerFrame;

        [self.view layoutSubviews]; // required by auto layout

    }

}

- (void)updateLayout

{

    [UIView animateWithDuration:0.25 animations:^{

        // viewDidLayoutSubviews will handle positioning the banner view so that it is visible.

        // You must not call [self.view layoutSubviews] directly.  However, you can flag the view

        // as requiring layout...

        [self.view setNeedsLayout];

        // ... then ask it to lay itself out immediately if it is flagged as requiring layout...

        [self.view layoutIfNeeded];

        // ... which has the same effect.

    }];

}

- (void)viewWillAppear:(BOOL)animated

{

    [super viewWillAppear:animated];

    [self.view addSubview:[BannerViewManager sharedInstance].bannerView];

}

- (NSString *)title

{

    return self.contentController.title;

}

@end

#pragma mark -

@interface BannerViewManager ()

@property (nonatomic, strong) ADBannerView *bannerView;

@property (nonatomic, strong) NSMutableSet *bannerViewControllers;

@end

@implementation BannerViewManager

+ (BannerViewManager *)sharedInstance

{

    static BannerViewManager *sharedInstance = nil;

    static dispatch_once_t onceToken;

    dispatch_once(&onceToken, ^{

        sharedInstance = [[BannerViewManager alloc] init];

    });

    return sharedInstance;

}

- (instancetype)init

{

    self = [super init];

    if (self != nil) {

        // On iOS 6 ADBannerView introduces a new initializer, use it when available.

        if ([ADBannerView instancesRespondToSelector:@selector(initWithAdType:)]) {

            self.bannerView = [[ADBannerView alloc] initWithAdType:ADAdTypeBanner];

        } else {

            self.bannerView = [[ADBannerView alloc] init];

        }

        self.bannerView.delegate = self;

        self.bannerViewControllers = [[NSMutableSet alloc] init];

    }

    return self;

}

- (void)addBannerViewController:(BannerViewController *)controller

{

    [self.bannerViewControllers addObject:controller];

}

- (void)removeBannerViewController:(BannerViewController *)controller

{

    [self.bannerViewControllers removeObject:controller];

}

- (void)bannerViewDidLoadAd:(ADBannerView *)banner

{

    NSLog(@"bannerViewDidLoadAd");

    for (BannerViewController *bvc in self.bannerViewControllers) {

        [bvc updateLayout];

    }

}

- (void)bannerView:(ADBannerView *)banner didFailToReceiveAdWithError:(NSError *)error

{

    NSLog(@"didFailToReceiveAdWithError %@", error);

    for (BannerViewController *bvc in self.bannerViewControllers) {

        [bvc updateLayout];

    }

}

- (BOOL)bannerViewActionShouldBegin:(ADBannerView *)banner willLeaveApplication:(BOOL)willLeave

{

    [[NSNotificationCenter defaultCenter] postNotificationName:BannerViewActionWillBegin object:self];

    return YES;

}

- (void)bannerViewActionDidFinish:(ADBannerView *)banner

{

    [[NSNotificationCenter defaultCenter] postNotificationName:BannerViewActionDidFinish object:self];

}

@end