#Tabs Add nullability annotations

PiperOrigin-RevId: 620068266

components/Tabs/src/TabBarView/MDCTabBarItem.h

@@ -16,9 +16,13 @@
 
 #import "MDCTabBarItemCustomViewing.h"
 
+NS_ASSUME_NONNULL_BEGIN
+
 /**
  A subclass of @c UITabBarItem that supports a custom view property.
  */
 __attribute__((objc_subclassing_restricted)) @interface MDCTabBarItem
     : UITabBarItem<MDCTabBarItemCustomViewing>
 @end
+
+NS_ASSUME_NONNULL_END

components/Tabs/src/TabBarView/MDCTabBarItem.m

@@ -14,8 +14,12 @@
 
 #import "MDCTabBarItem.h"
 
+NS_ASSUME_NONNULL_BEGIN
+
 @implementation MDCTabBarItem
 
 @synthesize mdc_customView = _mdc_customView;
 
 @end
+
+NS_ASSUME_NONNULL_END

components/Tabs/src/TabBarView/MDCTabBarItemCustomViewing.h

@@ -16,6 +16,8 @@
 
 #import "MDCTabBarViewCustomViewable.h"
 
+NS_ASSUME_NONNULL_BEGIN
+
 /**
  Defines the necessary APIs for MDCTabBarView to use a UITabBarItem for a custom view property.
 
@@ -28,3 +30,5 @@
 @property(nullable, nonatomic, strong) UIView<MDCTabBarViewCustomViewable> *mdc_customView;
 
 @end
+
+NS_ASSUME_NONNULL_END

components/Tabs/src/TabBarView/MDCTabBarView.h

@@ -16,6 +16,8 @@
 
 #import "MDCAvailability.h"
 
+NS_ASSUME_NONNULL_BEGIN
+
 @protocol MDCTabBarViewDelegate;
 @protocol MDCTabBarViewIndicatorTemplate;
 
@@ -271,7 +273,7 @@ __attribute__((objc_subclassing_restricted)) @interface MDCTabBarView : UIScroll
  @param item The tab bar item to be centered.
  @param animated Whether to animate the scroll.
  */
-- (void)scrollToItem:(UITabBarItem *)item animated:(BOOL)animated;
+- (void)scrollToItem:(nonnull UITabBarItem *)item animated:(BOOL)animated;
 
 /**
  The color for the Ripple effect for touch feedback.
@@ -298,3 +300,5 @@ __attribute__((objc_subclassing_restricted)) @interface MDCTabBarView : UIScroll
     UILargeContentViewerInteractionDelegate>
 @end
 #endif  // MDC_AVAILABLE_SDK_IOS(13_0)
+
+NS_ASSUME_NONNULL_END

components/Tabs/src/TabBarView/MDCTabBarView.m

@@ -32,6 +32,8 @@
 #import <CoreGraphics/CoreGraphics.h>
 #import <QuartzCore/QuartzCore.h>
 
+NS_ASSUME_NONNULL_BEGIN
+
 // KVO contexts
 static char *const kKVOContextMDCTabBarView = "kKVOContextMDCTabBarView";
 
@@ -149,7 +151,7 @@ - (instancetype)initWithFrame:(CGRect)frame {
   return self;
 }
 
-- (instancetype)initWithCoder:(NSCoder *)aDecoder {
+- (nullable instancetype)initWithCoder:(NSCoder *)aDecoder {
   self = [super initWithCoder:aDecoder];
   if (self) {
     [self commonMDCTabBarViewInit];
@@ -220,11 +222,11 @@ - (void)dealloc {
 
 #pragma mark - Properties
 
-- (void)setBarTintColor:(UIColor *)barTintColor {
+- (void)setBarTintColor:(nullable UIColor *)barTintColor {
   self.backgroundColor = barTintColor;
 }
 
-- (UIColor *)barTintColor {
+- (nullable UIColor *)barTintColor {
   return self.backgroundColor;
 }
 
@@ -243,7 +245,7 @@ - (void)setRippleColor:(UIColor *)rippleColor {
   [self updateRippleColorForAllViews];
 }
 
-- (void)setSelectionIndicatorStrokeColor:(UIColor *)selectionIndicatorStrokeColor {
+- (void)setSelectionIndicatorStrokeColor:(nullable UIColor *)selectionIndicatorStrokeColor {
   _selectionIndicatorStrokeColor = selectionIndicatorStrokeColor ?: UIColor.blackColor;
   self.selectionIndicatorView.tintColor = self.selectionIndicatorStrokeColor;
 }
@@ -383,11 +385,11 @@ - (void)setDisableRippleBehavior:(BOOL)disableRippleBehavior {
   }
 }
 
-- (void)setSelectedItem:(UITabBarItem *)selectedItem {
+- (void)setSelectedItem:(nullable UITabBarItem *)selectedItem {
   [self setSelectedItem:selectedItem animated:YES];
 }
 
-- (void)setSelectedItem:(UITabBarItem *)selectedItem animated:(BOOL)animated {
+- (void)setSelectedItem:(nullable UITabBarItem *)selectedItem animated:(BOOL)animated {
   if (self.selectedItem == selectedItem) {
     return;
   }
@@ -458,12 +460,12 @@ - (void)updateImageTintColorForAllViews {
   }
 }
 
-- (void)setImageTintColor:(UIColor *)imageTintColor forState:(UIControlState)state {
+- (void)setImageTintColor:(nullable UIColor *)imageTintColor forState:(UIControlState)state {
   self.stateToImageTintColor[@(state)] = imageTintColor;
   [self updateImageTintColorForAllViews];
 }
 
-- (UIColor *)imageTintColorForState:(UIControlState)state {
+- (nullable UIColor *)imageTintColorForState:(UIControlState)state {
   UIColor *color = self.stateToImageTintColor[@(state)];
   if (color == nil) {
     color = self.stateToImageTintColor[@(UIControlStateNormal)];
@@ -506,12 +508,12 @@ - (void)updateTitleColorForAllViewsAnimated:(BOOL)animated {
   }
 }
 
-- (void)setTitleColor:(UIColor *)titleColor forState:(UIControlState)state {
+- (void)setTitleColor:(nullable UIColor *)titleColor forState:(UIControlState)state {
   self.stateToTitleColor[@(state)] = titleColor;
   [self updateTitleColorForAllViewsAnimated:NO];
 }
 
-- (UIColor *)titleColorForState:(UIControlState)state {
+- (nullable UIColor *)titleColorForState:(UIControlState)state {
   UIColor *titleColor = self.stateToTitleColor[@(state)];
   if (!titleColor) {
     titleColor = self.stateToTitleColor[@(UIControlStateNormal)];
@@ -543,12 +545,12 @@ - (void)updateTitleFontForAllViews {
   }
 }
 
-- (void)setTitleFont:(UIFont *)titleFont forState:(UIControlState)state {
+- (void)setTitleFont:(nullable UIFont *)titleFont forState:(UIControlState)state {
   self.stateToTitleFont[@(state)] = titleFont;
   [self updateTitleFontForAllViews];
 }
 
-- (UIFont *)titleFontForState:(UIControlState)state {
+- (nullable UIFont *)titleFontForState:(UIControlState)state {
   UIFont *titleFont = self.stateToTitleFont[@(state)];
   if (!titleFont) {
     titleFont = self.stateToTitleFont[@(UIControlStateNormal)];
@@ -610,7 +612,7 @@ - (UIAccessibilityTraits)accessibilityTraits {
 
 #pragma mark - Custom APIs
 
-- (id)accessibilityElementForItem:(UITabBarItem *)item {
+- (nullable id)accessibilityElementForItem:(UITabBarItem *)item {
   NSUInteger itemIndex = [self.items indexOfObject:item];
   if (itemIndex == NSNotFound || itemIndex >= self.itemViews.count) {
     return nil;
@@ -721,10 +723,10 @@ - (void)removeObserversFromTabBarItems {
   }
 }
 
-- (void)observeValueForKeyPath:(NSString *)keyPath
-                      ofObject:(id)object
-                        change:(NSDictionary<NSKeyValueChangeKey, id> *)change
-                       context:(void *)context {
+- (void)observeValueForKeyPath:(nullable NSString *)keyPath
+                      ofObject:(nullable id)object
+                        change:(nullable NSDictionary<NSKeyValueChangeKey, id> *)change
+                       context:(nullable void *)context {
   if (context == kKVOContextMDCTabBarView) {
     if (!object) {
       return;
@@ -844,7 +846,7 @@ - (void)layoutSubviews {
                  CGRectGetWidth(self.bounds), kBottomDividerHeight);
 }
 
-- (void)traitCollectionDidChange:(UITraitCollection *)previousTraitCollection {
+- (void)traitCollectionDidChange:(nullable UITraitCollection *)previousTraitCollection {
   [super traitCollectionDidChange:previousTraitCollection];
 
   if (self.traitCollectionDidChangeBlock) {
@@ -1063,7 +1065,7 @@ - (void)layoutSubviewsForNonFixedClusteredCentered {
   [self updateItemViewsShouldProcessRippleWithScrollViewGestures:YES];
 }
 
-- (void)willMoveToSuperview:(UIView *)newSuperview {
+- (void)willMoveToSuperview:(nullable UIView *)newSuperview {
   [super willMoveToSuperview:newSuperview];
   self.needsScrollToSelectedItem = YES;
 }
@@ -1457,8 +1459,8 @@ - (UIView *)selectedItemView {
 #pragma mark - UIPointerInteractionDelegate
 
 #ifdef __IPHONE_13_4
-- (UIPointerStyle *)pointerInteraction:(UIPointerInteraction *)interaction
-                        styleForRegion:(UIPointerRegion *)region API_AVAILABLE(ios(13.4)) {
+- (nullable UIPointerStyle *)pointerInteraction:(UIPointerInteraction *)interaction
+                                 styleForRegion:(UIPointerRegion *)region API_AVAILABLE(ios(13.4)) {
   UIPointerStyle *pointerStyle = nil;
   if (interaction.view) {
     UITargetedPreview *targetedPreview = [[UITargetedPreview alloc] initWithView:interaction.view];
@@ -1485,9 +1487,9 @@ - (UIView *)itemViewForPoint:(CGPoint)point {
 }
 
 #if MDC_AVAILABLE_SDK_IOS(13_0)
-- (id<UILargeContentViewerItem>)largeContentViewerInteraction:
-                                    (UILargeContentViewerInteraction *)interaction
-                                                  itemAtPoint:(CGPoint)point
+- (nullable id<UILargeContentViewerItem>)largeContentViewerInteraction:
+                                             (UILargeContentViewerInteraction *)interaction
+                                                           itemAtPoint:(CGPoint)point
     NS_AVAILABLE_IOS(13_0) {
   if (!CGRectContainsPoint(self.bounds, point)) {
     // The touch has wandered outside of the view. Do not display the content viewer.
@@ -1525,7 +1527,7 @@ - (UIView *)itemViewForPoint:(CGPoint)point {
 }
 
 - (void)largeContentViewerInteraction:(UILargeContentViewerInteraction *)interaction
-                         didEndOnItem:(id<UILargeContentViewerItem>)item
+                         didEndOnItem:(nullable id<UILargeContentViewerItem>)item
                               atPoint:(CGPoint)point NS_AVAILABLE_IOS(13_0) {
   if (item) {
     for (NSUInteger i = 0; i < self.items.count; i++) {
@@ -1546,3 +1548,5 @@ - (void)largeContentViewerInteraction:(UILargeContentViewerInteraction *)interac
 #endif  // MDC_AVAILABLE_SDK_IOS(13_0)
 
 @end
+
+NS_ASSUME_NONNULL_END

components/Tabs/src/TabBarView/MDCTabBarViewCustomViewable.h

@@ -15,6 +15,8 @@
 #import <Foundation/Foundation.h>
 #import <UIKit/UIKit.h>
 
+NS_ASSUME_NONNULL_BEGIN
+
 /**
  A simple protocol that custom views rendered in MDCTabBarView must adopt.
 
@@ -46,3 +48,5 @@
 - (void)setSelected:(BOOL)selected animated:(BOOL)animated;
 
 @end
+
+NS_ASSUME_NONNULL_END

components/Tabs/src/TabBarView/MDCTabBarViewDelegate.h

@@ -15,6 +15,8 @@
 #import <Foundation/Foundation.h>
 #import <UIKit/UIKit.h>
 
+NS_ASSUME_NONNULL_BEGIN
+
 @class MDCTabBarView;
 
 /**
@@ -46,3 +48,5 @@
 - (void)tabBarView:(nonnull MDCTabBarView *)tabBarView didSelectItem:(nonnull UITabBarItem *)item;
 
 @end
+
+NS_ASSUME_NONNULL_END

components/Tabs/src/TabBarView/MDCTabBarViewIndicatorAttributes.h

@@ -14,10 +14,14 @@
 
 #import <UIKit/UIKit.h>
 
+NS_ASSUME_NONNULL_BEGIN
+
 /** Defines how a tab bar indicator should appear in a specific context. */
 @interface MDCTabBarViewIndicatorAttributes : NSObject <NSCopying>
 
 /** If non-nil, a path that should be filled with the indicator tint color. */
 @property(nonatomic, nullable) UIBezierPath *path;
 
 @end
+
+NS_ASSUME_NONNULL_END

components/Tabs/src/TabBarView/MDCTabBarViewIndicatorAttributes.m

@@ -14,11 +14,13 @@
 
 #import "MDCTabBarViewIndicatorAttributes.h"
 
+NS_ASSUME_NONNULL_BEGIN
+
 @implementation MDCTabBarViewIndicatorAttributes
 
 #pragma mark - NSCopying
 
-- (instancetype)copyWithZone:(__unused NSZone *)zone {
+- (instancetype)copyWithZone:(nullable __unused NSZone *)zone {
   MDCTabBarViewIndicatorAttributes *attributes = [[[self class] alloc] init];
   attributes.path = _path;
   return attributes;
@@ -49,3 +51,5 @@ - (NSUInteger)hash {
 }
 
 @end
+
+NS_ASSUME_NONNULL_END

components/Tabs/src/TabBarView/MDCTabBarViewIndicatorContext.h

@@ -14,6 +14,8 @@
 
 #import <UIKit/UIKit.h>
 
+NS_ASSUME_NONNULL_BEGIN
+
 /** Information about the context in which a tab bar indicator will be displayed. */
 @protocol MDCTabBarViewIndicatorContext <NSObject>
 
@@ -37,3 +39,5 @@
 @property(nonatomic, readonly) CGRect contentFrame;
 
 @end
+
+NS_ASSUME_NONNULL_END

components/Tabs/src/TabBarView/MDCTabBarViewIndicatorTemplate.h

@@ -14,6 +14,8 @@
 
 #import <UIKit/UIKit.h>
 
+NS_ASSUME_NONNULL_BEGIN
+
 @class MDCTabBarViewIndicatorAttributes;
 @protocol MDCTabBarViewIndicatorContext;
 
@@ -32,3 +34,5 @@
     (nonnull id<MDCTabBarViewIndicatorContext>)context;
 
 @end
+
+NS_ASSUME_NONNULL_END

components/Tabs/src/TabBarView/MDCTabBarViewUnderlineIndicatorTemplate.h

@@ -16,8 +16,12 @@
 
 #import "MDCTabBarViewIndicatorTemplate.h"
 
+NS_ASSUME_NONNULL_BEGIN
+
 /*
  Default indicator template which produces a fixed-height solid line underneath the selected tab.
  */
 @interface MDCTabBarViewUnderlineIndicatorTemplate : NSObject <MDCTabBarViewIndicatorTemplate>
 @end
+
+NS_ASSUME_NONNULL_END

components/Tabs/src/TabBarView/MDCTabBarViewUnderlineIndicatorTemplate.m

@@ -17,6 +17,8 @@
 #import "MDCTabBarViewIndicatorAttributes.h"
 #import "MDCTabBarViewIndicatorContext.h"
 
+NS_ASSUME_NONNULL_BEGIN
+
 /// Height in points of the underline shown under selected items.
 static const CGFloat kUnderlineIndicatorHeight = 2;
 
@@ -34,3 +36,5 @@ - (MDCTabBarViewIndicatorAttributes *)indicatorAttributesForContext:
 }
 
 @end
+
+NS_ASSUME_NONNULL_END

components/Tabs/src/TabBarView/private/MDCTabBarViewIndicatorView.h

@@ -14,6 +14,8 @@
 
 #import <UIKit/UIKit.h>
 
+NS_ASSUME_NONNULL_BEGIN
+
 @class MDCTabBarViewIndicatorAttributes;
 
 /** View responsible for drawing the indicator behind tab content and animating changes. */
@@ -38,3 +40,5 @@
 - (void)applySelectionIndicatorAttributes:(nonnull MDCTabBarViewIndicatorAttributes *)attributes;
 
 @end
+
+NS_ASSUME_NONNULL_END