Firebase cache expiration always as in debug mode - ios

Question

I'm trying to implement Firebase Remote Config in my iOS app. Everything works fine, but there is a problem - a remote config always fetches data from firebase server, not from cache. I have tried a lot of variants without any success.
This is my code:
+ (instancetype)sharedInstance
{
static ConfigManager *_sharedInstance = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
_sharedInstance = [[self alloc] init];
});
return _sharedInstance;
}
-(instancetype)init
{
self = [super init];
if (self) {
self.remoteConfig = [FIRRemoteConfig remoteConfig];
[self updateRemoteConfig];
}
return self;
}
- (void)activateDebugMode
{
FIRRemoteConfigSettings *remoteConfigSettings = [[FIRRemoteConfigSettings alloc] initWithDeveloperModeEnabled:YES];
self.remoteConfig.configSettings = remoteConfigSettings;
}
- (void)updateRemoteConfig
{
[self fetchConfigWithCompletionHandler:nil];
}
- (void)fetchConfigWithCompletionHandler: (FireBaseConfigCompletionHandler)completionHandler
{
NSTimeInterval cacheExpiration = 43200;
BOOL debug = ConfigurationValue(DebugMode);
if (debug) {
cacheExpiration = 0;
[self activateDebugMode];
}
[self.remoteConfig fetchWithExpirationDuration:cacheExpiration completionHandler:^(FIRRemoteConfigFetchStatus status, NSError * _Nullable error) {
if (status == FIRRemoteConfigFetchStatusSuccess) {
NSLog(#"Config fetched!");
[self.remoteConfig activateFetched];
// do smth
} else {
NSLog(#"Config not fetched");
NSLog(#"Error %#", error.localizedDescription);
}
}];
}
Even I use fetchWithCompletionHandler without cacheExpriration parameter, it also doesn't work. Setting remoteConfigSettings in debugMode = FALSE doesn't work either. I created a small test app with the same code and it works! The only difference us that I can see is "Enable Modules" parameter in Built Settings.
What am I doing wrong?
Thank you in advance!

Answer 1

Sorry, I don't know how to read Objective C code - but looks like when your app runs in debug mode, you set the cacheExpiration to 0.
When cacheExpiration is 0, network will be hit on all requests. This is meant to aid local development workflows. I would suggest retrying this code with a larger value of cacheExpiration
Please see https://firebase.google.com/docs/remote-config/android#caching_and_throttling