Visually load and unload specific `PSSpecifier`'s based on a different `PSSpecifier`'s value

Root.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>items</key>
	<array>
		<dict>
			<key>cell</key>
			<key>PSSwitchCell</key>
			<key>default</key>
			<false/>
			<key>defaults</key>
			<string>com.example.tweak.prefs</string>
			<key>key</key>
			<string>kSomeBoolValue</string>
			<key>label</key>
			<string>PSSwitchCell</string>
			<key>PostNotification</key>
			<string>com.example.tweak.prefs/ReloadPrefs</string>
		</dict>
		<dict>
			<key>cell</key>
			<string>PSStaticTextCell</string>
			<key>label</key>
			<string>PSStaticTextCell</string>
			<key>dependsOn</key>
			<!-- 
			Special cases:
			'*' - Multiple dependencies, all must be true
			'!' - Inverse dependency, if true, this specifier is hidden
			 -->
			<string>kSomeBoolValue</string>
		</dict>
	</array>
	<key>title</key>
	<string>title</string>
</dict>
</plist>

TweakRootListController.h

#import <Preferences/PSListController.h>

@interface TweakRootListController : PSListController
- (NSMutableArray *)visibleSpecifiersFromPlist:(NSString *)plist;
@end

TweakRootListController.m

@implementation TweakRootListController

- (NSArray *)specifiers {
	if (!_specifiers) {
		_specifiers = [self visibleSpecifiersFromPlist:@"Root"];
	}

	return _specifiers;
}

- (void)setPreferenceValue:(id)value specifier:(PSSpecifier *)specifier {
	[super setPreferenceValue:value specifier:specifier];
	[self reloadSpecifiers];
}

- (NSMutableArray *)visibleSpecifiersFromPlist:(NSString *)plist {
	NSDictionary *preferences = /* load your preferences here */;
	NSMutableArray *specifiers = [[self loadSpecifiersFromPlistName:plist target:self] mutableCopy];

	for (PSSpecifier *specifier in [specifiers reverseObjectEnumerator]) {
		NSString *dependency = [specifier propertyForKey:@"dependsOn"];
		if (dependency) {
			if ([dependency containsString:@"*"]) { // Multiple dependencies
				NSArray *dependencies = [dependency componentsSeparatedByString:@"*"];
				BOOL allDependenciesMet = YES;
				for (NSString *dep in dependencies) {
					if (![[preferences objectForKey:dep] boolValue]) {
						allDependenciesMet = NO;
						break;
					}
				}
				if (!allDependenciesMet) {
					[specifiers removeObject:specifier];
				}
			} else { // Single dependency
				if ([dependency containsString:@"!"]) {
					dependency = [dependency stringByReplacingOccurrencesOfString:@"!" withString:@""];
					if ([[preferences objectForKey:dependency] boolValue]) {
						[specifiers removeObject:specifier];
					}
				} else {
					if (![[preferences objectForKey:dependency] boolValue]) {
						[specifiers removeObject:specifier];
					}
				}
			}
		}
	}

	return specifiers;
}

@end