[Tabs] Fix image tint color when unselecting an item. (#7756)

When the selected item became `nil`, the image tint color for the previously-selected item was not updated.

Follow-up to #7714

components/Tabs/src/TabBarView/MDCTabBarView.m

@@ -189,6 +189,8 @@ - (void)setSelectedItem:(UITabBarItem *)selectedItem animated:(BOOL)animated {
   if (!selectedItem) {
     _selectedItem = selectedItem;
     [self updateTitleColorForAllViews];
+    [self updateImageTintColorForAllViews];
+    [self updateTitleFontForAllViews];
     return;
   }
 
@@ -205,6 +207,7 @@ - (void)setSelectedItem:(UITabBarItem *)selectedItem animated:(BOOL)animated {
       (newSelectedItemView.accessibilityTraits | UIAccessibilityTraitSelected);
   [self updateTitleColorForAllViews];
   [self updateImageTintColorForAllViews];
+  [self updateTitleFontForAllViews];
   CGRect itemFrameInScrollViewBounds =
       [self convertRect:self.containerView.arrangedSubviews[itemIndex].frame
                fromView:self.containerView];
@@ -410,7 +413,6 @@ - (void)observeValueForKeyPath:(NSString *)keyPath
   } else {
     [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
   }
-  [self updateTitleColorForAllViews];
 }
 
 #pragma mark - UIView

components/Tabs/tests/snapshot/TabBarView/MDCTabBarViewSnapshotTests.m

@@ -360,6 +360,27 @@ - (void)testChangingSelectedItemIgnoresSelectedImage {
   [self generateSnapshotAndVerifyForView:self.tabBarView];
 }
 
+- (void)testRemovingSelectedItemUpdatesStyle {
+  // Given
+  UITabBarItem *item1 = [[UITabBarItem alloc] initWithTitle:@"One" image:self.typicalIcon1 tag:0];
+  UITabBarItem *item2 = [[UITabBarItem alloc] initWithTitle:@"Two" image:self.typicalIcon2 tag:1];
+  self.tabBarView.items = @[ item1, item2 ];
+  [self.tabBarView sizeToFit];
+  [self.tabBarView setSelectedItem:item1 animated:NO];
+  [self.tabBarView setTitleColor:UIColor.blackColor forState:UIControlStateNormal];
+  [self.tabBarView setImageTintColor:UIColor.blackColor forState:UIControlStateNormal];
+  [self.tabBarView setTitleFont:[UIFont systemFontOfSize:8] forState:UIControlStateNormal];
+  [self.tabBarView setTitleColor:UIColor.whiteColor forState:UIControlStateSelected];
+  [self.tabBarView setImageTintColor:UIColor.whiteColor forState:UIControlStateSelected];
+  [self.tabBarView setTitleFont:[UIFont systemFontOfSize:24] forState:UIControlStateSelected];
+
+  // When
+  [self.tabBarView setSelectedItem:nil animated:NO];
+
+  // Then
+  [self generateSnapshotAndVerifyForView:self.tabBarView];
+}
+
 - (void)testSelectedItemInitiallyVisibleLTRLatin {
   // Given
   self.tabBarView.bounds =
@@ -893,8 +914,10 @@ - (void)testChangingSelectionUpdatesItemStyle {
   [self.tabBarView setSelectedItem:item2 animated:NO];
   [self.tabBarView setTitleColor:UIColor.purpleColor forState:UIControlStateNormal];
   [self.tabBarView setImageTintColor:UIColor.redColor forState:UIControlStateNormal];
+  [self.tabBarView setTitleFont:[UIFont systemFontOfSize:8] forState:UIControlStateNormal];
   [self.tabBarView setTitleColor:UIColor.brownColor forState:UIControlStateSelected];
   [self.tabBarView setImageTintColor:UIColor.blueColor forState:UIControlStateSelected];
+  [self.tabBarView setTitleFont:[UIFont systemFontOfSize:24] forState:UIControlStateSelected];
 
   // When
   [self.tabBarView setSelectedItem:item3 animated:NO];