59 lines
1.4 KiB
Objective-C
59 lines
1.4 KiB
Objective-C
//
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// NSUserDefaults+RACSupport.m
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// ReactiveObjC
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//
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// Created by Matt Diephouse on 12/19/13.
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// Copyright (c) 2013 GitHub, Inc. All rights reserved.
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//
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#import "NSUserDefaults+RACSupport.h"
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#import <ReactiveObjC/RACEXTScope.h>
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#import "NSNotificationCenter+RACSupport.h"
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#import "NSObject+RACDeallocating.h"
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#import "RACChannel.h"
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#import "RACScheduler.h"
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#import "RACSignal+Operations.h"
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@implementation NSUserDefaults (RACSupport)
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- (RACChannelTerminal *)rac_channelTerminalForKey:(NSString *)key {
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NSParameterAssert(key != nil);
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RACChannel *channel = [RACChannel new];
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RACScheduler *scheduler = [RACScheduler scheduler];
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__block BOOL ignoreNextValue = NO;
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@weakify(self);
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[[[[[[[NSNotificationCenter.defaultCenter
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rac_addObserverForName:NSUserDefaultsDidChangeNotification object:self]
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map:^(id _) {
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@strongify(self);
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return [self objectForKey:key];
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}]
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startWith:[self objectForKey:key]]
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// Don't send values that were set on the other side of the terminal.
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filter:^ BOOL (id _) {
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if (RACScheduler.currentScheduler == scheduler && ignoreNextValue) {
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ignoreNextValue = NO;
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return NO;
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}
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return YES;
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}]
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distinctUntilChanged]
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takeUntil:self.rac_willDeallocSignal]
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subscribe:channel.leadingTerminal];
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[[channel.leadingTerminal
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deliverOn:scheduler]
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subscribeNext:^(id value) {
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@strongify(self);
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ignoreNextValue = YES;
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[self setObject:value forKey:key];
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}];
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return channel.followingTerminal;
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}
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@end
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