Using @selector instead of keys for associated objects

UIKit+AFNetworking/UIButton+AFNetworking.m

@@ -22,15 +22,12 @@
 
 #import "UIButton+AFNetworking.h"
 
-#import <objc/message.h>
+#import <objc/runtime.h>
 
 #if defined(__IPHONE_OS_VERSION_MIN_REQUIRED)
 
 #import "AFHTTPRequestOperation.h"
 
-static char kAFImageRequestOperationKey;
-static char kAFBackgroundImageRequestOperationKey;
-
 @interface UIButton (_AFNetworking)
 @property (readwrite, nonatomic, strong, setter = af_setImageRequestOperation:) AFHTTPRequestOperation *af_imageRequestOperation;
 @property (readwrite, nonatomic, strong, setter = af_setBackgroundImageRequestOperation:) AFHTTPRequestOperation *af_backgroundImageRequestOperation;
@@ -50,19 +47,19 @@ + (NSOperationQueue *)af_sharedImageRequestOperationQueue {
 }
 
 - (AFHTTPRequestOperation *)af_imageRequestOperation {
-    return (AFHTTPRequestOperation *)objc_getAssociatedObject(self, &kAFImageRequestOperationKey);
+    return (AFHTTPRequestOperation *)objc_getAssociatedObject(self, @selector(af_imageRequestOperation));
 }
 
 - (void)af_setImageRequestOperation:(AFHTTPRequestOperation *)imageRequestOperation {
-    objc_setAssociatedObject(self, &kAFImageRequestOperationKey, imageRequestOperation, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+    objc_setAssociatedObject(self, @selector(af_imageRequestOperation), imageRequestOperation, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
 }
 
 - (AFHTTPRequestOperation *)af_backgroundImageRequestOperation {
-    return (AFHTTPRequestOperation *)objc_getAssociatedObject(self, &kAFBackgroundImageRequestOperationKey);
+    return (AFHTTPRequestOperation *)objc_getAssociatedObject(self, @selector(af_backgroundImageRequestOperation));
 }
 
 - (void)af_setBackgroundImageRequestOperation:(AFHTTPRequestOperation *)imageRequestOperation {
-    objc_setAssociatedObject(self, &kAFBackgroundImageRequestOperationKey, imageRequestOperation, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+    objc_setAssociatedObject(self, @selector(af_backgroundImageRequestOperation), imageRequestOperation, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
 }
 
 @end

UIKit+AFNetworking/UIImageView+AFNetworking.m

@@ -33,10 +33,6 @@ @interface AFImageCache : NSCache <AFImageCache>
 
 #pragma mark -
 
-static char kAFSharedImageCacheKey;
-static char kAFImageRequestOperationKey;
-static char kAFResponseSerializerKey;
-
 @interface UIImageView (_AFNetworking)
 @property (readwrite, nonatomic, strong, setter = af_setImageRequestOperation:) AFHTTPRequestOperation *af_imageRequestOperation;
 @end
@@ -55,11 +51,11 @@ + (NSOperationQueue *)af_sharedImageRequestOperationQueue {
 }
 
 - (AFHTTPRequestOperation *)af_imageRequestOperation {
-    return (AFHTTPRequestOperation *)objc_getAssociatedObject(self, &kAFImageRequestOperationKey);
+    return (AFHTTPRequestOperation *)objc_getAssociatedObject(self, @selector(af_imageRequestOperation));
 }
 
 - (void)af_setImageRequestOperation:(AFHTTPRequestOperation *)imageRequestOperation {
-    objc_setAssociatedObject(self, &kAFImageRequestOperationKey, imageRequestOperation, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+    objc_setAssociatedObject(self, @selector(af_imageRequestOperation), imageRequestOperation, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
 }
 
 @end
@@ -82,12 +78,12 @@ @implementation UIImageView (AFNetworking)
 
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wgnu"
-    return objc_getAssociatedObject(self, &kAFSharedImageCacheKey) ?: _af_defaultImageCache;
+    return objc_getAssociatedObject(self, @selector(sharedImageCache)) ?: _af_defaultImageCache;
 #pragma clang diagnostic pop
 }
 
 + (void)setSharedImageCache:(id<AFImageCache>)imageCache {
-    objc_setAssociatedObject(self, &kAFSharedImageCacheKey, imageCache, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+    objc_setAssociatedObject(self, @selector(sharedImageCache), imageCache, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
 }
 
 - (id <AFURLResponseSerialization>)imageResponseSerializer {
@@ -99,12 +95,12 @@ + (void)setSharedImageCache:(id<AFImageCache>)imageCache {
 
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wgnu"
-    return objc_getAssociatedObject(self, &kAFResponseSerializerKey) ?: _af_defaultImageResponseSerializer;
+    return objc_getAssociatedObject(self, @selector(imageResponseSerializer)) ?: _af_defaultImageResponseSerializer;
 #pragma clang diagnostic pop
 }
 
 - (void)setImageResponseSerializer:(id <AFURLResponseSerialization>)serializer {
-    objc_setAssociatedObject(self, &kAFResponseSerializerKey, serializer, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+    objc_setAssociatedObject(self, @selector(imageResponseSerializer), serializer, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
 }
 
 #pragma mark -

UIKit+AFNetworking/UIProgressView+AFNetworking.m

@@ -35,9 +35,6 @@
 static void * AFTaskCountOfBytesSentContext = &AFTaskCountOfBytesSentContext;
 static void * AFTaskCountOfBytesReceivedContext = &AFTaskCountOfBytesReceivedContext;
 
-static char kAFUploadProgressAnimated;
-static char kAFDownloadProgressAnimated;
-
 @interface AFURLConnectionOperation (_UIProgressView)
 @property (readwrite, nonatomic, copy) void (^uploadProgress)(NSUInteger bytes, long long totalBytes, long long totalBytesExpected);
 @property (readwrite, nonatomic, assign, setter = af_setUploadProgressAnimated:) BOOL af_uploadProgressAnimated;
@@ -59,19 +56,19 @@ @implementation AFURLConnectionOperation (_UIProgressView)
 @implementation UIProgressView (AFNetworking)
 
 - (BOOL)af_uploadProgressAnimated {
-    return [(NSNumber *)objc_getAssociatedObject(self, &kAFUploadProgressAnimated) boolValue];
+    return [(NSNumber *)objc_getAssociatedObject(self, @selector(af_uploadProgressAnimated)) boolValue];
 }
 
 - (void)af_setUploadProgressAnimated:(BOOL)animated {
-    objc_setAssociatedObject(self, &kAFUploadProgressAnimated, @(animated), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+    objc_setAssociatedObject(self, @selector(af_uploadProgressAnimated), @(animated), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
 }
 
 - (BOOL)af_downloadProgressAnimated {
-    return [(NSNumber *)objc_getAssociatedObject(self, &kAFDownloadProgressAnimated) boolValue];
+    return [(NSNumber *)objc_getAssociatedObject(self, @selector(af_downloadProgressAnimated)) boolValue];
 }
 
 - (void)af_setDownloadProgressAnimated:(BOOL)animated {
-    objc_setAssociatedObject(self, &kAFDownloadProgressAnimated, @(animated), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+    objc_setAssociatedObject(self, @selector(af_downloadProgressAnimated), @(animated), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
 }
 
 #pragma mark -

UIKit+AFNetworking/UIWebView+AFNetworking.m

@@ -28,22 +28,18 @@
 
 #import "AFHTTPRequestOperation.h"
 
-static char kAFRequestSerializerKey;
-static char kAFResponseSerializerKey;
-static char kAFHTTPRequestOperationKey;
-
 @interface UIWebView (_AFNetworking)
 @property (readwrite, nonatomic, strong, setter = af_setHTTPRequestOperation:) AFHTTPRequestOperation *af_HTTPRequestOperation;
 @end
 
 @implementation UIWebView (_AFNetworking)
 
 - (AFHTTPRequestOperation *)af_HTTPRequestOperation {
-    return (AFHTTPRequestOperation *)objc_getAssociatedObject(self, &kAFHTTPRequestOperationKey);
+    return (AFHTTPRequestOperation *)objc_getAssociatedObject(self, @selector(af_HTTPRequestOperation));
 }
 
 - (void)af_setHTTPRequestOperation:(AFHTTPRequestOperation *)operation {
-    objc_setAssociatedObject(self, &kAFHTTPRequestOperationKey, operation, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+    objc_setAssociatedObject(self, @selector(af_HTTPRequestOperation), operation, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
 }
 
 @end
@@ -61,12 +57,12 @@ @implementation UIWebView (AFNetworking)
 
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wgnu"
-    return objc_getAssociatedObject(self, &kAFRequestSerializerKey) ?: _af_defaultRequestSerializer;
+    return objc_getAssociatedObject(self, @selector(requestSerializer)) ?: _af_defaultRequestSerializer;
 #pragma clang diagnostic pop
 }
 
 - (void)setRequestSerializer:(AFHTTPRequestSerializer<AFURLRequestSerialization> *)requestSerializer {
-    objc_setAssociatedObject(self, &kAFRequestSerializerKey, requestSerializer, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+    objc_setAssociatedObject(self, @selector(requestSerializer), requestSerializer, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
 }
 
 - (AFHTTPResponseSerializer <AFURLResponseSerialization> *)responseSerializer {
@@ -78,12 +74,12 @@ - (void)setRequestSerializer:(AFHTTPRequestSerializer<AFURLRequestSerialization>
 
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wgnu"
-    return objc_getAssociatedObject(self, &kAFRequestSerializerKey) ?: _af_defaultResponseSerializer;
+    return objc_getAssociatedObject(self, @selector(responseSerializer)) ?: _af_defaultResponseSerializer;
 #pragma clang diagnostic pop
 }
 
 - (void)setResponseSerializer:(AFHTTPResponseSerializer<AFURLResponseSerialization> *)responseSerializer {
-    objc_setAssociatedObject(self, &kAFResponseSerializerKey, responseSerializer, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+    objc_setAssociatedObject(self, @selector(responseSerializer), responseSerializer, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
 }
 
 #pragma mark -