From 6088c79dd19e570fe99f3baffb5aaf97030ad508 Mon Sep 17 00:00:00 2001
From: George Cox <gcox18@gmail.com>
Date: Fri, 6 Jan 2017 15:13:10 -0500
Subject: [PATCH] Adds support for ignoring synthesized or specified
 properties;

* Adds class method that, if overridden to return YES, will cause synthesized properties to be ignored.
* Adds class method that, if implemented to return an array of keys, will cause any property with a matching key to be ignored.
---
 GVUserDefaults/GVUserDefaults.h |  2 ++
 GVUserDefaults/GVUserDefaults.m | 13 +++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/GVUserDefaults/GVUserDefaults.h b/GVUserDefaults/GVUserDefaults.h
index e746095..8ae4ab0 100644
--- a/GVUserDefaults/GVUserDefaults.h
+++ b/GVUserDefaults/GVUserDefaults.h
@@ -11,5 +11,7 @@
 @interface GVUserDefaults : NSObject
 
 + (instancetype)standardUserDefaults;
++ (BOOL)ignoreSynthesizedProperties;
++ (NSArray<NSString *> *)ignoredKeys;
 
 @end
diff --git a/GVUserDefaults/GVUserDefaults.m b/GVUserDefaults/GVUserDefaults.m
index 6454ae0..a800858 100644
--- a/GVUserDefaults/GVUserDefaults.m
+++ b/GVUserDefaults/GVUserDefaults.m
@@ -133,6 +133,14 @@ + (instancetype)standardUserDefaults {
     return sharedInstance;
 }
 
++ (BOOL)ignoreSynthesizedProperties {
+    return NO;
+}
+
++ (NSArray<NSString *> *)ignoredKeys {
+    return nil;
+}
+
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wundeclared-selector"
 #pragma GCC diagnostic ignored "-Warc-performSelector-leaks"
@@ -192,6 +200,11 @@ - (void)generateAccessorMethods {
         const char *name = property_getName(property);
         const char *attributes = property_getAttributes(property);
 
+        if ((void *)(strstr(attributes, ",D")-attributes) == NULL
+            || ([self.class ignoredKeys] != nil
+                && [[self.class ignoredKeys] containsObject:[[NSString alloc] initWithUTF8String:name]])) {
+            continue;
+        }
         char *getter = strstr(attributes, ",G");
         if (getter) {
             getter = strdup(getter + 2);