[Issue #2381] Using static char declaration pointers for associated o…

…bject keys in UIButton category

UIKit+AFNetworking/UIButton+AFNetworking.h

@@ -32,6 +32,8 @@
 
 /**
  This category adds methods to the UIKit framework's `UIButton` class. The methods in this category provide support for loading remote images and background images asynchronously from a URL.
+ 
+ @warning Compound values for control `state` (such as `UIControlStateHighlighted | UIControlStateDisabled`) are unsupported.
  */
 @interface UIButton (AFNetworking)
 

UIKit+AFNetworking/UIButton+AFNetworking.m

@@ -49,8 +49,23 @@ + (NSOperationQueue *)af_sharedImageRequestOperationQueue {
 
 #pragma mark -
 
+static char AFImageRequestOperationNormal;
+static char AFImageRequestOperationHighlighted;
+static char AFImageRequestOperationSelected;
+static char AFImageRequestOperationDisabled;
+
 static const char * af_imageRequestOperationKeyForState(UIControlState state) {
-    return [[NSString stringWithFormat:@"af_imageRequestOperationKeyForState_%lu", (unsigned long)state] cStringUsingEncoding:NSASCIIStringEncoding];
+    switch (state) {
+        case UIControlStateHighlighted:
+            return &AFImageRequestOperationHighlighted;
+        case UIControlStateSelected:
+            return &AFImageRequestOperationSelected;
+        case UIControlStateDisabled:
+            return &AFImageRequestOperationDisabled;
+        case UIControlStateNormal:
+        default:
+            return &AFImageRequestOperationNormal;
+    }
 }
 
 - (AFHTTPRequestOperation *)af_imageRequestOperationForState:(UIControlState)state {
@@ -65,8 +80,23 @@ - (void)af_setImageRequestOperation:(AFHTTPRequestOperation *)imageRequestOperat
 
 #pragma mark -
 
+static char AFBackgroundImageRequestOperationNormal;
+static char AFBackgroundImageRequestOperationHighlighted;
+static char AFBackgroundImageRequestOperationSelected;
+static char AFBackgroundImageRequestOperationDisabled;
+
 static const char * af_backgroundImageRequestOperationKeyForState(UIControlState state) {
-    return [[NSString stringWithFormat:@"af_backgroundImageRequestOperationKeyForState_%lu", (unsigned long)state] cStringUsingEncoding:NSASCIIStringEncoding];
+    switch (state) {
+        case UIControlStateHighlighted:
+            return &AFBackgroundImageRequestOperationHighlighted;
+        case UIControlStateSelected:
+            return &AFBackgroundImageRequestOperationSelected;
+        case UIControlStateDisabled:
+            return &AFBackgroundImageRequestOperationDisabled;
+        case UIControlStateNormal:
+        default:
+            return &AFBackgroundImageRequestOperationNormal;
+    }
 }
 
 - (AFHTTPRequestOperation *)af_backgroundImageRequestOperationForState:(UIControlState)state {