Add availability check for appearanceWhenContainedInInstancesOfClasses

Author: frankus

Apptentive/Apptentive/Apptentive.m

@@ -933,9 +933,14 @@ @implementation ApptentiveNavigationController
 - (nullable instancetype)initWithCoder:(NSCoder *)aDecoder {
 	self = [super initWithCoder:aDecoder];
 	if (self) {
-
-		if (!([UINavigationBar appearance].barTintColor || [UINavigationBar appearanceWhenContainedInInstancesOfClasses:@[ [ApptentiveNavigationController class] ]].barTintColor)) {
-			[UINavigationBar appearanceWhenContainedInInstancesOfClasses:@[ [ApptentiveNavigationController class] ]].barTintColor = [UIColor whiteColor];
+		if (@available(iOS 9.0, *)) {
+			if (!([UINavigationBar appearance].barTintColor || [UINavigationBar appearanceWhenContainedInInstancesOfClasses:@[ [ApptentiveNavigationController class] ]].barTintColor)) {
+				[UINavigationBar appearanceWhenContainedInInstancesOfClasses:@[ [ApptentiveNavigationController class] ]].barTintColor = [UIColor whiteColor];
+			}
+		} else {
+			if (!([UINavigationBar appearance].barTintColor || [UINavigationBar appearanceWhenContainedIn:[ApptentiveNavigationController class], nil].barTintColor)) {
+				[UINavigationBar appearanceWhenContainedIn:[ApptentiveNavigationController class], nil].barTintColor = [UIColor whiteColor];
+			}
 		}
 	}
 	return self;