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Example/Pods/ReactiveObjC/ReactiveObjC/UIButton+RACCommandSupport.m

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+//
+//  UIButton+RACCommandSupport.m
+//  ReactiveObjC
+//
+//  Created by Ash Furrow on 2013-06-06.
+//  Copyright (c) 2013 GitHub, Inc. All rights reserved.
+//
+
+#import "UIButton+RACCommandSupport.h"
+#import <ReactiveObjC/RACEXTKeyPathCoding.h>
+#import "RACCommand.h"
+#import "RACDisposable.h"
+#import "RACSignal+Operations.h"
+#import <objc/runtime.h>
+
+static void *UIButtonRACCommandKey = &UIButtonRACCommandKey;
+static void *UIButtonEnabledDisposableKey = &UIButtonEnabledDisposableKey;
+
+@implementation UIButton (RACCommandSupport)
+
+- (RACCommand *)rac_command {
+	return objc_getAssociatedObject(self, UIButtonRACCommandKey);
+}
+
+- (void)setRac_command:(RACCommand *)command {
+	objc_setAssociatedObject(self, UIButtonRACCommandKey, command, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+	
+	// Check for stored signal in order to remove it and add a new one
+	RACDisposable *disposable = objc_getAssociatedObject(self, UIButtonEnabledDisposableKey);
+	[disposable dispose];
+	
+	if (command == nil) return;
+	
+	disposable = [command.enabled setKeyPath:@keypath(self.enabled) onObject:self];
+	objc_setAssociatedObject(self, UIButtonEnabledDisposableKey, disposable, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+	
+	[self rac_hijackActionAndTargetIfNeeded];
+}
+
+- (void)rac_hijackActionAndTargetIfNeeded {
+	SEL hijackSelector = @selector(rac_commandPerformAction:);
+	
+	for (NSString *selector in [self actionsForTarget:self forControlEvent:UIControlEventTouchUpInside]) {
+		if (hijackSelector == NSSelectorFromString(selector)) {
+			return;
+		}
+	}
+	
+	[self addTarget:self action:hijackSelector forControlEvents:UIControlEventTouchUpInside];
+}
+
+- (void)rac_commandPerformAction:(id)sender {
+	[self.rac_command execute:sender];
+}
+
+@end