fix(iPhone X): Fix for bottom area padding for accept button on iPhone X. (#138)

* add bottom padding based on safe area

* use common method

Author: e7mac

Leanplum-SDK/Classes/LPMessageTemplates.m

@@ -1036,10 +1036,7 @@ - (void)updateHtmlLayoutWithContext:(LPActionContext *)context
     CGFloat htmlHeight = [[context numberNamed:LPMT_ARG_HTML_HEIGHT] doubleValue];
     BOOL isFullscreen = htmlHeight < 1;
     BOOL isIPhoneX = statusBarHeight > 40;
-    CGFloat bottomSafeAreaHeight = 0;
-    if (@available(iOS 11.0, *)) {
-        bottomSafeAreaHeight = [UIApplication sharedApplication].keyWindow.safeAreaInsets.bottom;
-    }
+    CGFloat bottomSafeAreaHeight = [self safeAreaInsets].bottom;
 
     // Banner logic.
     if (!isFullscreen) {
@@ -1154,7 +1151,7 @@ - (void)updateNonWebPopupLayout:(int)statusBarHeight
     } else {
         _acceptButton.frame = CGRectMake(
                                          (_popupView.frame.size.width - textSize.width - 2*LPMT_ACCEPT_BUTTON_MARGIN) / 2,
-                                         _popupView.frame.size.height - textSize.height - 3*LPMT_ACCEPT_BUTTON_MARGIN,
+                                         _popupView.frame.size.height - textSize.height - 3*LPMT_ACCEPT_BUTTON_MARGIN - [self safeAreaInsets].bottom,
                                          textSize.width + 2*LPMT_ACCEPT_BUTTON_MARGIN,
                                          textSize.height + 2*LPMT_ACCEPT_BUTTON_MARGIN);
     }
@@ -1224,6 +1221,16 @@ - (void)refreshPopupContent
     }
 }
 
+-(UIEdgeInsets)safeAreaInsets
+{
+    UIEdgeInsets insets = UIEdgeInsetsMake(0.0, 0.0, 0.0, 0.0);
+    if (@available(iOS 11.0, *)) {
+        insets =  [UIApplication sharedApplication].keyWindow.safeAreaInsets;
+    }
+    return insets;
+}
+
+
 - (void)appStorePrompt
 {
     dispatch_async(dispatch_get_main_queue(), ^{