TabbedBanner/TabbedBanner/BannerViewController.m

/*
Copyright (C) 2013-2015 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 "BannerViewController.h"
 
NSString * const BannerViewActionWillBegin = @"BannerViewActionWillBegin";
NSString * const BannerViewActionDidFinish = @"BannerViewActionDidFinish";
 
@interface BannerViewController ()
 
// This method is used by BannerViewSingletonController to inform instances of BannerViewController that the banner has loaded/unloaded.
- (void)updateLayout;
 
@end
 
@interface BannerViewManager : NSObject <ADBannerViewDelegate>
 
@property (nonatomic, readonly) ADBannerView *bannerView;
 
+ (BannerViewManager *)sharedInstance;
 
- (void)addBannerViewController:(BannerViewController *)controller;
- (void)removeBannerViewController:(BannerViewController *)controller;
 
@end
 
@implementation BannerViewController {
    UIViewController *_contentController;
}
 
- (instancetype)initWithContentViewController:(UIViewController *)contentController
{
    // If contentController is nil, -loadView is going to throw an exception when it attempts to setup
    // containment of a nil view controller.  Instead, throw the exception here and make it obvious
    // what is wrong.
    NSAssert(contentController != nil, @"Attempting to initialize a BannerViewController with a nil contentController.");
    
    self = [super init];
    if (self != nil) {
        _contentController = contentController;
        [[BannerViewManager sharedInstance] addBannerViewController:self];
    }
    return self;
}
 
- (void)dealloc
{
    [[BannerViewManager sharedInstance] removeBannerViewController:self];
}
 
- (void)loadView
{
    UIView *contentView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    
    // Setup containment of the _contentController.
    [self addChildViewController:_contentController];
    [contentView addSubview:_contentController.view];
    [_contentController didMoveToParentViewController:self];
    
    self.view = contentView;
}
 
#if __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_6_0
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return [_contentController shouldAutorotateToInterfaceOrientation:interfaceOrientation];
}
#endif
 
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
    return [_contentController preferredInterfaceOrientationForPresentation];
}
 
- (NSUInteger)supportedInterfaceOrientations
{
    return [_contentController supportedInterfaceOrientations];
}
 
- (void)viewDidLayoutSubviews
{
    CGRect contentFrame = self.view.bounds, bannerFrame = CGRectZero;
    ADBannerView *bannerView = [BannerViewManager sharedInstance].bannerView;
#if __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_6_0
    NSString *contentSizeIdentifier;
    // If configured to support iOS <6.0, then we need to set the currentContentSizeIdentifier in order to resize the banner properly.
    // This continues to work on iOS 6.0, so we won't need to do anything further to resize the banner.
    if (contentFrame.size.width < contentFrame.size.height) {
        contentSizeIdentifier = ADBannerContentSizeIdentifierPortrait;
    } else {
        contentSizeIdentifier = ADBannerContentSizeIdentifierLandscape;
    }
    bannerFrame.size = [ADBannerView sizeFromBannerContentSizeIdentifier:contentSizeIdentifier];
#else
    // 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];
#endif
    
    if (bannerView.bannerLoaded) {
        contentFrame.size.height -= bannerFrame.size.height;
        bannerFrame.origin.y = contentFrame.size.height;
    } else {
        bannerFrame.origin.y = contentFrame.size.height;
    }
    _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;
#if __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_6_0
        bannerView.currentContentSizeIdentifier = contentSizeIdentifier;
#endif
    }
}
 
- (void)updateLayout
{
    [UIView animateWithDuration:0.25 animations:^{
        // -viewDidLayoutSubviews will handle positioning the banner such that it is either visible
        // or hidden depending upon whether its bannerLoaded property is YES or NO.  We just need our view
        // to (re)lay itself out so -viewDidLayoutSubviews will be called.
        // 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 _contentController.title;
}
 
@end
 
@implementation BannerViewManager {
    ADBannerView *_bannerView;
    NSMutableSet *_bannerViewControllers;
}
 
+ (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:)]) {
            _bannerView = [[ADBannerView alloc] initWithAdType:ADAdTypeBanner];
        } else {
            _bannerView = [[ADBannerView alloc] init];
        }
        _bannerView.delegate = self;
        _bannerViewControllers = [[NSMutableSet alloc] init];
    }
    return self;
}
 
- (void)addBannerViewController:(BannerViewController *)controller
{
    [_bannerViewControllers addObject:controller];
}
 
- (void)removeBannerViewController:(BannerViewController *)controller
{
    [_bannerViewControllers removeObject:controller];
}
 
- (void)bannerViewDidLoadAd:(ADBannerView *)banner
{
    for (BannerViewController *bvc in _bannerViewControllers) {
        [bvc updateLayout];
    }
}
 
- (void)bannerView:(ADBannerView *)banner didFailToReceiveAdWithError:(NSError *)error
{
    for (BannerViewController *bvc in _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


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