Fix placeholder color for iOS7

Classes/DialerViewController.m

@@ -153,6 +153,17 @@ static UICompositeViewDescription *compositeDescription = nil;
                 [videoCameraSwitch setHidden:TRUE];
             }
         }
+
+#if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_6_0 // attributed string only available since iOS6
+        if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7) {
+            // fix placeholder bar color in iOS7
+            UIColor *color = [UIColor grayColor];
+            addressField.attributedPlaceholder = [[NSAttributedString alloc]
+                                                  initWithString:addressField.placeholder
+                                                  attributes:@{NSForegroundColorAttributeName: color}];
+        }
+#endif
+
     }
 }