[BottomNavigation] Delete `itemsContentInsets` API (#6584)

The `itemsContentInsets` API behaves unintuitively and is not used by
any internal clients. Since the Material Guidelines article for Bottom
Navigation does not allow customization of the positioning of the item
views within a Bottom Navigation, it's simply extra maintenance effort
without any clear value.

Resolves #6556

components/BottomNavigation/src/MDCBottomNavigationBar.h

@@ -139,14 +139,6 @@ typedef NS_ENUM(NSInteger, MDCBottomNavigationBarAlignment) {
  */
 @property(nonatomic, assign, getter=isBackgroundBlurEnabled) BOOL backgroundBlurEnabled;
 
-/**
- The inset applied to each items bounds to determine the rect in which the items' contents will be
- centered. The contents are centered in this rect, but not compressed, so they may still extend
- beyond these bounds. Defaults to {0, 0, 0, 0}. The inset is flipped for RTL.
- */
-@property(nonatomic, assign)
-    UIEdgeInsets itemsContentInsets __deprecated_msg("This API will be removed.");
-
 /**
  The margin between the item's icon and title when alignment is either Justified or Centered.
  Defaults to 0.

components/BottomNavigation/src/MDCBottomNavigationBar.m

@@ -445,10 +445,6 @@ - (void)setItems:(NSArray<UITabBarItem *> *)items {
     itemView.accessibilityLabel = item.accessibilityLabel;
     itemView.accessibilityHint = item.accessibilityHint;
     itemView.isAccessibilityElement = item.isAccessibilityElement;
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wdeprecated-declarations"
-    itemView.contentInsets = self.itemsContentInsets;
-#pragma clang diagnostic pop
     itemView.contentVerticalMargin = self.itemsContentVerticalMargin;
     itemView.contentHorizontalMargin = self.itemsContentHorizontalMargin;
     MDCInkTouchController *controller = [[MDCInkTouchController alloc] initWithView:itemView];
@@ -517,18 +513,6 @@ - (void)setSelectedItem:(UITabBarItem *)selectedItem animated:(BOOL)animated {
   }
 }
 
-- (void)setItemsContentInsets:(UIEdgeInsets)itemsContentInsets {
-  if (UIEdgeInsetsEqualToEdgeInsets(_itemsContentInsets, itemsContentInsets)) {
-    return;
-  }
-  _itemsContentInsets = itemsContentInsets;
-  for (NSUInteger i = 0; i < self.items.count; i++) {
-    MDCBottomNavigationItemView *itemView = self.itemViews[i];
-    itemView.contentInsets = itemsContentInsets;
-  }
-  [self setNeedsLayout];
-}
-
 - (void)setItemsContentVerticalMargin:(CGFloat)itemsContentsVerticalMargin {
   if (MDCCGFloatEqual(_itemsContentVerticalMargin, itemsContentsVerticalMargin)) {
     return;

components/BottomNavigation/src/private/MDCBottomNavigationItemView.h

@@ -37,8 +37,6 @@
 @property(nonatomic, strong) UIColor *unselectedItemTintColor UI_APPEARANCE_SELECTOR;
 @property(nonatomic, strong) UIColor *selectedItemTitleColor;
 
-@property(nonatomic, assign) UIEdgeInsets contentInsets;
-
 @property(nonatomic, assign) CGFloat contentVerticalMargin;
 @property(nonatomic, assign) CGFloat contentHorizontalMargin;
 

components/BottomNavigation/src/private/MDCBottomNavigationItemView.m

@@ -217,7 +217,7 @@ - (void)layoutSubviews {
 }
 
 - (void)centerLayoutAnimated:(BOOL)animated {
-  CGRect contentBoundingRect = UIEdgeInsetsInsetRect(self.bounds, self.contentInsets);
+  CGRect contentBoundingRect = CGRectStandardize(self.bounds);
   CGFloat centerY = CGRectGetMidY(contentBoundingRect);
   CGFloat centerX = CGRectGetMidX(contentBoundingRect);
   UIUserInterfaceLayoutDirection layoutDirection = self.mdf_effectiveUserInterfaceLayoutDirection;

components/BottomNavigation/tests/snapshot/MDCBottomNavigationItemViewSnapshotTests.m

@@ -299,90 +299,4 @@ - (void)testTypicalWidthTallHeightLongTitleEmptyBadgeAdjacentRTL {
   [self generateAndVerifySnapshot];
 }
 
-#pragma mark - ContentInsets
-
-- (void)testContentInsetsStackedLTR {
-  // When
-  // Shift DOWN and RIGHT
-  self.itemView.titleBelowIcon = YES;
-  self.itemView.contentInsets = UIEdgeInsetsMake(10, 5, -10, -5);
-  self.itemView.frame = CGRectMake(0, 0, kWidthTypical, kHeightTypical);
-
-  [self generateAndVerifySnapshot];
-}
-
-- (void)testContentInsetsStackedRTL {
-  // When
-  // Shift DOWN and LEFT
-  [self changeToRTLAndArabicWithBadgeValue:kBadgeTitleEmpty];
-  self.itemView.titleBelowIcon = YES;
-  self.itemView.contentInsets = UIEdgeInsetsMake(10, 5, -10, -5);
-  self.itemView.frame = CGRectMake(0, 0, kWidthTypical, kHeightTypical);
-
-  [self generateAndVerifySnapshot];
-}
-
-- (void)testContentInsetsNoopStackedLTR {
-  // When
-  self.itemView.titleBelowIcon = YES;
-  self.itemView.contentInsets = UIEdgeInsetsMake(kHeightTypical / 2, kWidthTypical / 2,
-                                                 kHeightTypical / 2, kWidthTypical / 2);
-  self.itemView.frame = CGRectMake(0, 0, kWidthTypical, kHeightTypical);
-
-  [self generateAndVerifySnapshot];
-}
-
-- (void)testContentInsetsNoopStackedRTL {
-  // When
-  [self changeToRTLAndArabicWithBadgeValue:kBadgeTitleEmpty];
-  self.itemView.titleBelowIcon = YES;
-  self.itemView.contentInsets = UIEdgeInsetsMake(kHeightTypical / 2, kWidthTypical / 2,
-                                                 kHeightTypical / 2, kWidthTypical / 2);
-  self.itemView.frame = CGRectMake(0, 0, kWidthTypical, kHeightTypical);
-
-  [self generateAndVerifySnapshot];
-}
-
-- (void)testContentInsetsAdjacentLTR {
-  // When
-  // Shift UP and LEFT
-  self.itemView.titleBelowIcon = NO;
-  self.itemView.contentInsets = UIEdgeInsetsMake(-5, -10, 5, 10);
-  self.itemView.frame = CGRectMake(0, 0, kWidthTypical, kHeightTypical);
-
-  [self generateAndVerifySnapshot];
-}
-
-- (void)testContentInsetsAdjacentRTL {
-  // When
-  // Shift UP and RIGHT
-  [self changeToRTLAndArabicWithBadgeValue:kBadgeTitleEmpty];
-  self.itemView.titleBelowIcon = NO;
-  self.itemView.contentInsets = UIEdgeInsetsMake(-5, -10, 5, 10);
-  self.itemView.frame = CGRectMake(0, 0, kWidthTypical, kHeightTypical);
-
-  [self generateAndVerifySnapshot];
-}
-
-- (void)testContentInsetsNoopAdjacentLTR {
-  // When
-  self.itemView.titleBelowIcon = NO;
-  self.itemView.contentInsets = UIEdgeInsetsMake(kHeightTypical / 2, kWidthTypical / 2,
-                                                 kHeightTypical / 2, kWidthTypical / 2);
-  self.itemView.frame = CGRectMake(0, 0, kWidthTypical, kHeightTypical);
-
-  [self generateAndVerifySnapshot];
-}
-
-- (void)testContentInsetsNoopAdjacentRTL {
-  // When
-  [self changeToRTLAndArabicWithBadgeValue:kBadgeTitleEmpty];
-  self.itemView.titleBelowIcon = NO;
-  self.itemView.contentInsets = UIEdgeInsetsMake(kHeightTypical / 2, kWidthTypical / 2,
-                                                 kHeightTypical / 2, kWidthTypical / 2);
-  self.itemView.frame = CGRectMake(0, 0, kWidthTypical, kHeightTypical);
-
-  [self generateAndVerifySnapshot];
-}
-
 @end

components/BottomNavigation/tests/unit/BottomNavigationItemViewTests.m

@@ -86,30 +86,6 @@ - (void)testHorizontalMarginLayout {
                              (CGFloat)0.001);
 }
 
-- (void)testContentInsetLayout {
-  // Given
-  MDCBottomNavigationItemView *view = [[MDCBottomNavigationItemView alloc] init];
-  view.title = @"Test Content";
-  view.image = fakeImage();
-  view.bounds = CGRectMake(0, 0, 100, 100);
-  view.contentVerticalMargin = 20;
-  view.contentHorizontalMargin = 20;
-  view.titleVisibility = MDCBottomNavigationBarTitleVisibilityAlways;
-
-  // When
-  view.titleBelowIcon = YES;
-  view.contentInsets = UIEdgeInsetsMake(10, 10, 5, 5);
-  [view layoutSubviews];
-
-  // Then
-  CGRect contentRect = UIEdgeInsetsInsetRect(view.bounds, view.contentInsets);
-  XCTAssert(view.label.center.x == CGRectGetMidX(contentRect));
-  XCTAssert(view.iconImageView.center.x == CGRectGetMidX(contentRect));
-  CGFloat contentSpan = CGRectGetMaxY(view.label.frame) - CGRectGetMinY(view.iconImageView.frame);
-  XCTAssertEqualWithAccuracy(CGRectGetMinY(view.iconImageView.frame) + contentSpan / 2,
-                             CGRectGetMidY(contentRect), (CGFloat)0.001);
-}
-
 - (void)testSetSelectedItemTintColorUpdatesInkColor {
   // Given
   MDCBottomNavigationItemView *item1 = [[MDCBottomNavigationItemView alloc] init];