[ios] Fix iOS 8 incompatibility in scale bar RTL check

1 files changed, 8 insertions, 3 deletions

diff --git a/platform/ios/src/MGLScaleBar.mm b/platform/ios/src/MGLScaleBar.mm
index f63c39009f..1cf1caf0fe 100644
--- a/platform/ios/src/MGLScaleBar.mm
+++ b/platform/ios/src/MGLScaleBar.mm
@@ -175,10 +175,15 @@ static const CGFloat MGLFeetPerMeter = 3.28084;
     return [self usesMetricSystem] ? self.metersPerPoint : self.metersPerPoint * MGLFeetPerMeter;
 }
 
-#pragma mark - Convenient methods
+#pragma mark - Convenience methods
 
 - (BOOL)usesRightToLeftLayout {
-    return [UIView userInterfaceLayoutDirectionForSemanticContentAttribute:self.superview.semanticContentAttribute] == UIUserInterfaceLayoutDirectionRightToLeft;
+    // semanticContentAttribute is iOS 9+
+    if ([self.superview respondsToSelector:@selector(semanticContentAttribute)]) {
+        return [UIView userInterfaceLayoutDirectionForSemanticContentAttribute:self.superview.semanticContentAttribute] == UIUserInterfaceLayoutDirectionRightToLeft;
+    } else {
+        return UIApplication.sharedApplication.userInterfaceLayoutDirection == UIUserInterfaceLayoutDirectionRightToLeft;
+    }
 }
 
 - (BOOL)usesMetricSystem {
@@ -244,7 +249,7 @@ static const CGFloat MGLFeetPerMeter = 3.28084;
     
     CGFloat alpha = maximumDistance > allowedDistance ? .0f : 1.0f;
     
-    if(self.alpha != alpha) {
+    if (self.alpha != alpha) {
         [UIView animateWithDuration:.2f delay:0 options:UIViewAnimationOptionBeginFromCurrentState animations:^{
             self.alpha = alpha;
         } completion:nil];