Added macro to check if iOS version is >= 5.0 at both compile and run…

…ning time + fix spinner setColor on older iOS versions (spinners color set to gray). Closes Simbul#182

Classes/RootViewController.m

@@ -57,6 +57,19 @@
 
 #define INDEX_FILE_NAME @"index.html"
 
+// IOS VERSION >= 5.0 MACRO
+#ifndef kCFCoreFoundationVersionNumber_iPhoneOS_5_0
+    #define kCFCoreFoundationVersionNumber_iPhoneOS_5_0 675.00
+#endif
+#if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_5_0
+    #define IF_IOS5_OR_GREATER(...) \
+    if (kCFCoreFoundationVersionNumber >= kCFCoreFoundationVersionNumber_iPhoneOS_5_0) { \
+        __VA_ARGS__ \
+    }
+#else
+    #define IF_IOS5_OR_GREATER(...)
+#endif
+
 @implementation RootViewController
 
 #pragma mark - SYNTHESIS
@@ -241,10 +254,12 @@ - (void)initPageDetails {
         [backgroundView release];
 
         // ****** Spinners
-        UIActivityIndicatorView *spinner = [[UIActivityIndicatorView alloc] init];
+        UIActivityIndicatorView *spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
         spinner.backgroundColor = [UIColor clearColor];
-        spinner.color = foregroundColor;
-        spinner.alpha = [(NSNumber*) foregroundAlpha floatValue];
+        IF_IOS5_OR_GREATER(
+            spinner.color = foregroundColor;
+            spinner.alpha = [(NSNumber*) foregroundAlpha floatValue];
+        );
 
         CGRect frame = spinner.frame;
         frame.origin.x = pageWidth * i + (pageWidth - frame.size.width) / 2;