Add isPointerInteractionEnabled availability check.

There are still some iOS 13.4 betas floating around that had not yet introduced this API. This
change should prevent those users from crashing when attempting to get/set this value.

PiperOrigin-RevId: 326248791

Author: bryanoltman

components/Buttons/src/MDCFloatingButton+Animation.m

@@ -13,6 +13,7 @@
 // limitations under the License.
 
 #import "MDCFloatingButton+Animation.h"
+#import "MDCFloatingButton.h"
 
 #if TARGET_IPHONE_SIMULATOR
 float UIAnimationDragCoefficient(void);  // Private API for simulator animation speed
@@ -96,8 +97,10 @@ - (void)expand:(BOOL)animated completion:(void (^_Nullable)(void))completion {
 #ifdef __IPHONE_13_4
   BOOL wasPointerInteractionEnabled = NO;
   if (@available(iOS 13.4, *)) {
-    wasPointerInteractionEnabled = self.pointerInteractionEnabled;
-    self.pointerInteractionEnabled = NO;
+    if ([self respondsToSelector:@selector(isPointerInteractionEnabled)]) {
+      wasPointerInteractionEnabled = self.pointerInteractionEnabled;
+      self.pointerInteractionEnabled = NO;
+    }
   }
 #endif
   void (^expandActions)(void) = ^{
@@ -111,7 +114,9 @@ - (void)expand:(BOOL)animated completion:(void (^_Nullable)(void))completion {
     [self.imageView.layer removeAnimationForKey:kMDCFloatingButtonTransformKey];
 #ifdef __IPHONE_13_4
     if (@available(iOS 13.4, *)) {
-      self.pointerInteractionEnabled = wasPointerInteractionEnabled;
+      if ([self respondsToSelector:@selector(isPointerInteractionEnabled)]) {
+        self.pointerInteractionEnabled = wasPointerInteractionEnabled;
+      }
     }
 #endif
     if (completion) {
@@ -188,8 +193,10 @@ - (void)collapse:(BOOL)animated completion:(void (^_Nullable)(void))completion {
 #ifdef __IPHONE_13_4
   BOOL wasPointerInteractionEnabled = NO;
   if (@available(iOS 13.4, *)) {
-    wasPointerInteractionEnabled = self.pointerInteractionEnabled;
-    self.pointerInteractionEnabled = NO;
+    if ([self respondsToSelector:@selector(isPointerInteractionEnabled)]) {
+      wasPointerInteractionEnabled = self.pointerInteractionEnabled;
+      self.pointerInteractionEnabled = NO;
+    }
   }
 #endif
 
@@ -204,7 +211,9 @@ - (void)collapse:(BOOL)animated completion:(void (^_Nullable)(void))completion {
     [self.imageView.layer removeAnimationForKey:kMDCFloatingButtonTransformKey];
 #ifdef __IPHONE_13_4
     if (@available(iOS 13.4, *)) {
-      self.pointerInteractionEnabled = wasPointerInteractionEnabled;
+      if ([self respondsToSelector:@selector(isPointerInteractionEnabled)]) {
+        self.pointerInteractionEnabled = wasPointerInteractionEnabled;
+      }
     }
 #endif
     if (completion) {

components/Dialogs/src/private/MDCAlertActionManager.m

@@ -13,6 +13,7 @@
 // limitations under the License.
 
 #import "MDCAlertActionManager.h"
+#import "MaterialButtons.h"
 
 @interface MDCAlertActionManager ()
 
@@ -93,7 +94,9 @@ - (MDCButton *)makeButtonForAction:(MDCAlertAction *)action
   button.accessibilityIdentifier = action.accessibilityIdentifier;
 #ifdef __IPHONE_13_4
   if (@available(iOS 13.4, *)) {
-    button.pointerInteractionEnabled = YES;
+    if ([self respondsToSelector:@selector(isPointerInteractionEnabled)]) {
+      button.pointerInteractionEnabled = YES;
+    }
   }
 #endif
   [button addTarget:target action:selector forControlEvents:UIControlEventTouchUpInside];