How to call specific function for a global class? - ios

Question

I have some Realm models in my app that all use a base class. In this class I wrote some generic functions like the one below:
- (void)save {
self.updatedAt = [NSDate date];
[self.realm beginWriteTransaction];
[self.realm addOrUpdateObject:self];
[self.realm commitWriteTransaction];
[[SyncEngine sharedInstance] store:self];
}
Now, I also wrote a class called SyncEngine, which checks if some available synchronization methods are enabled and then calls them:
- (void)store:(id)object {
if ([Preferences CloudKitEnabled]) {
[self.cloudKit store:object];
}
}
This is where my problem arises. I have written a base class called CloudKitManager which has some generic functions. I then create a specific CloudKitClass for every model in my app, so I'll end up with CloudKitRestaurant and CloudKitTable. All of these will contain a function (void)store:(id)sender. What would be the best way to call the store function of a specific CloudKit class, based on the class that is being stored in Realm?
Ideally, I'd like for RLMRestaurant to automatically use CloudKitRestaurant and not have to use and if else or switch statement.
For further clarity, this is how SyncEngine works.
#interface SyncEngine()
#property (nonatomic, strong) CloudKitManager *cloudKitManager;
#end
#implementation SyncEngine
static SyncEngine *sharedInstance = nil;
+ (SyncEngine *)sharedInstance {
if (sharedInstance == nil) {
sharedInstance = [[self alloc] init];
}
return sharedInstance;
}
- (instancetype)init {
self = [super init];
if (self) {
self.cloudKitManager = [[CloudKitManager alloc] init];
}
return self;
}
#end

Answer 1

In my opinion, you should keep type of CloudKitManager class inside RLMBase object. And when you need to call [[CloudKitManager sharedInstance] store:object], call [[object.cloudKitClass sharedInstance] store:object].
Try my code below.
#interface RLMBase : NSObject
- (Class)cloudKitClass;
#end
#implementation RLMBase
- (Class)cloudKitClass {
// Must be overridden in subclass.
return CloudKitManager.class;
}
#end
#interface RLMRestaurant : RLMBase
#end
#implementation RLMRestaurant
- (Class)cloudKitClass {
return CloudKitRestaurant.class;
}
#end
- (void)store:(RLMBase *)object {
if ([Preferences CloudKitEnabled]) {
[[object.cloudKitClass sharedInstance] store:object];
}
}
ANOTHER WAY
Put store: method from SyncEngine to RLMBase object.
#interface RLMBase : NSObject
- (Class)cloudKitClass;
- (void)store;
#end
#implementation RLMBase
- (Class)cloudKitClass {
// Must be overridden in subclass.
return CloudKitManager.class;
}
- (void)store {
if ([Preferences CloudKitEnabled]) {
[[self.cloudKitClass sharedInstance] store:self];
}
}
#end
And save method will become
- (void)save {
self.updatedAt = [NSDate date];
[self.realm beginWriteTransaction];
[self.realm addOrUpdateObject:self];
[self.realm commitWriteTransaction];
[self store];
}