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UIButton+RACCommandSupport.m
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UIButton+RACCommandSupport.m
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//
// UIButton+RACCommandSupport.m
// ReactiveCocoa
//
// Created by Ash Furrow on 2013-06-06.
// Copyright (c) 2013 GitHub, Inc. All rights reserved.
//
#import "UIButton+RACCommandSupport.h"
#import "EXTKeyPathCoding.h"
#import "NSObject+RACPropertySubscribing.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