When content inset changes (due to a change in the button height due to a change in frame size), notify the subclasses to handle it accordingly.

Author: mdznr

Classes/MTZWhatsNewViewController/MTZWhatsNewGridViewController.m

@@ -85,8 +85,8 @@ - (void)__MTZWhatsNewGridViewController_Setup
 	[self.collectionView registerClass:[UICollectionReusableView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"whatsnew"];
 	[self.collectionView registerClass:[MTZWhatsNewFeatureCollectionViewCell class] forCellWithReuseIdentifier:@"feature"];
 	self.collectionView.backgroundColor = [UIColor clearColor];
-	self.collectionView.contentInset = self.contentInsets;
-	self.collectionView.scrollIndicatorInsets = self.contentInsets;
+	self.collectionView.contentInset = self.contentInset;
+	self.collectionView.scrollIndicatorInsets = self.contentInset;
 
 	// Defaults.
 	self.templatedIcons = YES;
@@ -95,7 +95,7 @@ - (void)__MTZWhatsNewGridViewController_Setup
 - (void)viewDidAppear:(BOOL)animated
 {
 	[super viewDidAppear:animated];
-	[self.collectionView flashScrollIndicators];
+	[self.collectionView performSelector:@selector(flashScrollIndicators) withObject:nil afterDelay:0];
 }
 
 - (void)styleDidChange
@@ -139,6 +139,13 @@ - (void)setFeatures:(NSDictionary *)features
 	[self.collectionView reloadData];
 }
 
+- (void)contentInsetDidChange
+{
+	[super contentInsetDidChange];
+	self.collectionView.contentInset = self.contentInset;
+	self.collectionView.scrollIndicatorInsets = self.contentInset;
+}
+
 - (void)setTemplatedIcons:(BOOL)templatedIcons
 {
 	_templatedIcons = templatedIcons;

Classes/MTZWhatsNewViewController/MTZWhatsNewViewController.h

@@ -71,7 +71,10 @@ typedef NS_ENUM(NSUInteger, MTZWhatsNewViewControllerStyle) {
 /// @discussion This method is called when the style has been changed. You should override this method to perform custom tasks associated with changing the style. If you override this method, you must call super at some point in your implementation. Note that this can be called when the receiver's @c automaticallySetStyle is set to @c YES and not only after changes are made directly to the @c style property.
 - (void)styleDidChange __attribute__((objc_requires_super));
 
-///	The content insets to use in a subclss.
-@property (nonatomic, readonly) UIEdgeInsets contentInsets;
+///	The content inset to use in a subclss.
+@property (nonatomic, readonly) UIEdgeInsets contentInset;
+
+///	Notifies the view controller that the content inset has changed.
+- (void)contentInsetDidChange __attribute__((objc_requires_super));
 
 @end

Classes/MTZWhatsNewViewController/MTZWhatsNewViewController.m

@@ -17,12 +17,15 @@ @interface MTZWhatsNewViewController ()
 ///	A private read/write property of `contentView`.
 @property (readwrite) UIView *contentView;
 
-///	A private read/write property of `contentInsets`.
-@property (readwrite) UIEdgeInsets contentInsets;
+///	A private read/write property of `contentInset`.
+@property (readwrite) UIEdgeInsets contentInset;
 
 ///	The button to dismiss the view controller.
 @property (strong, nonatomic) UIButton *dismissButton;
 
+///	The background behind the dismiss button.
+@property (strong, nonatomic) UIToolbar *buttonBackground;
+
 @end
 
 
@@ -71,10 +74,6 @@ - (void)commonInit
 	self.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
 	self.modalPresentationStyle = UIModalPresentationFormSheet;
 
-	CGFloat buttonHeight = [self shouldUseLargeButton] ? 82.0f : 50.0f;
-	UIFont *buttonFont = [self shouldUseLargeButton] ? [UIFont fontWithName:@"HelveticaNeue-Light" size:29.0f] : [UIFont fontWithName:@"HelveticaNeue" size:18.0f];
-	self.contentInsets = UIEdgeInsetsMake(0, 0, buttonHeight, 0);
-	
 	// Background View.
 	SAMGradientView *gradientView = [[SAMGradientView alloc] init];
 	self.backgroundView = gradientView;
@@ -91,20 +90,19 @@ - (void)commonInit
 	[self.view addConstraints:[NSLayoutConstraint constraintsToFillToSuperview:self.contentView]];
 
 	// Dismiss Button.
-	UIToolbar *buttonBackground = [[UIToolbar alloc] init];
-	[self.view addSubview:buttonBackground];
-	buttonBackground.translatesAutoresizingMaskIntoConstraints = NO;
-	[self.view addConstraints:[NSLayoutConstraint constraintsToStickView:buttonBackground toEdges:UIRectEdgeLeft|UIRectEdgeBottom|UIRectEdgeRight]];
-	[buttonBackground addConstraint:[NSLayoutConstraint constraintToSetStaticHeight:buttonHeight toView:buttonBackground]];
+	self.buttonBackground = [[UIToolbar alloc] init];
+	[self.view addSubview:self.buttonBackground];
+	self.buttonBackground.translatesAutoresizingMaskIntoConstraints = NO;
+	[self.view addConstraints:[NSLayoutConstraint constraintsToStickView:self.buttonBackground toEdges:UIRectEdgeLeft|UIRectEdgeBottom|UIRectEdgeRight]];
 
 	self.dismissButton = [[UIButton alloc] init];
 	self.dismissButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
-	[buttonBackground addSubview:self.dismissButton];
+	[self.buttonBackground addSubview:self.dismissButton];
 	self.dismissButton.translatesAutoresizingMaskIntoConstraints = NO;
-	[self.dismissButton.superview addConstraints:[NSLayoutConstraint constraintsToFillToSuperview:self.dismissButton]];
-	self.dismissButton.titleLabel.font = buttonFont;
 	[self.dismissButton addTarget:self action:@selector(didTapContinueButton:) forControlEvents:UIControlEventTouchUpInside];
 
+	[self reloadButtonHeight];
+	
 	// Defaults.
 	self.backgroundGradientTopColor = [UIColor whiteColor];
 	self.backgroundGradientBottomColor = [UIColor whiteColor];
@@ -113,11 +111,30 @@ - (void)commonInit
 	self.dismissButtonTitle = NSLocalizedString(@"Get Started", nil);
 }
 
+- (void)reloadButtonHeight
+{
+	UIFont *buttonFont = [self shouldUseLargeButton] ? [UIFont fontWithName:@"HelveticaNeue-Light" size:29.0f] : [UIFont fontWithName:@"HelveticaNeue" size:18.0f];
+	self.dismissButton.titleLabel.font = buttonFont;
+	
+	CGFloat buttonHeight = [self shouldUseLargeButton] ? 82.0f : 50.0f;
+	[self.buttonBackground removeConstraints:self.buttonBackground.constraints];
+	[self.buttonBackground addConstraint:[NSLayoutConstraint constraintToSetStaticHeight:buttonHeight toView:self.buttonBackground]];
+	[self.buttonBackground addConstraints:[NSLayoutConstraint constraintsToFillToSuperview:self.dismissButton]];
+	
+	self.contentInset = UIEdgeInsetsMake(self.topLayoutGuide.length, 0, self.bottomLayoutGuide.length+buttonHeight, 0);
+}
+
 - (BOOL)prefersStatusBarHidden
 {
 	return YES;
 }
 
+- (void)viewWillLayoutSubviews
+{
+	[super viewWillLayoutSubviews];
+	[self reloadButtonHeight];
+}
+
 
 #pragma mark - Actions
 
@@ -172,6 +189,12 @@ - (void)setDismissButtonTitle:(NSString *)dismissButtonText
 	[self.dismissButton setTitle:_dismissButtonTitle forState:UIControlStateNormal];
 }
 
+- (void)setContentInset:(UIEdgeInsets)contentInset
+{
+	_contentInset = contentInset;
+	[self contentInsetDidChange];
+}
+
 
 #pragma mark - Style
 
@@ -201,6 +224,11 @@ - (MTZWhatsNewViewControllerStyle)appropriateStyleForBackgroundOfColor:(UIColor
 	}
 }
 
+- (void)contentInsetDidChange
+{
+	// An empty implementation.
+}
+
 - (void)styleDidChange
 {
 	// An empty implementation.