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Example/Pods/ReactiveObjC/ReactiveObjC/UIAlertView+RACSignalSupport.m

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+//
+//  UIAlertView+RACSignalSupport.m
+//  ReactiveObjC
+//
+//  Created by Henrik Hodne on 6/16/13.
+//  Copyright (c) 2013 GitHub, Inc. All rights reserved.
+//
+
+#import "UIAlertView+RACSignalSupport.h"
+#import "RACDelegateProxy.h"
+#import "RACSignal+Operations.h"
+#import "NSObject+RACDeallocating.h"
+#import "NSObject+RACDescription.h"
+#import <objc/runtime.h>
+
+@implementation UIAlertView (RACSignalSupport)
+
+static void RACUseDelegateProxy(UIAlertView *self) {
+	if (self.delegate == self.rac_delegateProxy) return;
+
+	self.rac_delegateProxy.rac_proxiedDelegate = self.delegate;
+	self.delegate = (id)self.rac_delegateProxy;
+}
+
+- (RACDelegateProxy *)rac_delegateProxy {
+	RACDelegateProxy *proxy = objc_getAssociatedObject(self, _cmd);
+	if (proxy == nil) {
+		proxy = [[RACDelegateProxy alloc] initWithProtocol:@protocol(UIAlertViewDelegate)];
+		objc_setAssociatedObject(self, _cmd, proxy, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+	}
+
+	return proxy;
+}
+
+- (RACSignal *)rac_buttonClickedSignal {
+	RACSignal *signal = [[[[self.rac_delegateProxy
+		signalForSelector:@selector(alertView:clickedButtonAtIndex:)]
+		reduceEach:^(UIAlertView *alertView, NSNumber *buttonIndex) {
+			return buttonIndex;
+		}]
+		takeUntil:self.rac_willDeallocSignal]
+		setNameWithFormat:@"%@ -rac_buttonClickedSignal", RACDescription(self)];
+
+	RACUseDelegateProxy(self);
+
+	return signal;
+}
+
+- (RACSignal *)rac_willDismissSignal {
+	RACSignal *signal = [[[[self.rac_delegateProxy
+		signalForSelector:@selector(alertView:willDismissWithButtonIndex:)]
+		reduceEach:^(UIAlertView *alertView, NSNumber *buttonIndex) {
+			return buttonIndex;
+		}]
+		takeUntil:self.rac_willDeallocSignal]
+		setNameWithFormat:@"%@ -rac_willDismissSignal", RACDescription(self)];
+
+	RACUseDelegateProxy(self);
+
+	return signal;
+}
+
+@end