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#import "NSObject+DefaultsObserver.h"
#import <AppKit/AppKit.h>
#import <objc/runtime.h>
@interface GBUserDefaultsObserverHelper : NSObject
@end
@implementation GBUserDefaultsObserverHelper
+ (void)observeValueForKeyPath:(NSString *)keyPath
ofObject:(id)object
change:(NSDictionary<NSKeyValueChangeKey,id> *)change
context:(void *)context
{
[[NSNotificationCenter defaultCenter] postNotificationName:[keyPath stringByAppendingString:@"Changed$DefaultsObserver"]
object:nil
userInfo:@{
@"value": change[NSKeyValueChangeNewKey]
}];
}
+ (void)startObservingKey:(NSString *)key
{
if (!NSThread.isMainThread) {
dispatch_sync(dispatch_get_main_queue(), ^{
[self startObservingKey:key];
});
return;
}
static NSMutableSet *set = nil;
if (!set) {
set = [NSMutableSet set];
}
if ([set containsObject:key]) return;
[set addObject:key];
[[NSUserDefaults standardUserDefaults] addObserver:(id)self
forKeyPath:key
options:NSKeyValueObservingOptionNew
context:nil];
}
@end
@implementation NSObject (DefaultsObserver)
- (void)observeStandardDefaultsKey:(NSString *)key selector:(SEL)selector
{
__weak id weakSelf = self;
[self observeStandardDefaultsKey:key
withBlock:^(id newValue) {
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
[weakSelf performSelector:selector withObject:newValue];
#pragma clang diagnostic pop
}];
}
- (void)observeStandardDefaultsKey:(NSString *)key withBlock:(void(^)(id newValue))block
{
NSString *notificationName = [key stringByAppendingString:@"Changed$DefaultsObserver"];
objc_setAssociatedObject(self, sel_registerName(notificationName.UTF8String), block, OBJC_ASSOCIATION_RETAIN);
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(standardDefaultsKeyChanged:)
name:notificationName
object:nil];
[GBUserDefaultsObserverHelper startObservingKey:key];
block([[NSUserDefaults standardUserDefaults] objectForKey:key]);
}
- (void)standardDefaultsKeyChanged:(NSNotification *)notification
{
SEL selector = sel_registerName(notification.name.UTF8String);
((void(^)(id))objc_getAssociatedObject(self, selector))(notification.userInfo[@"value"]);
}
@end
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