Push notifications segmentation

we using php create api mobile , pusher trigger events. need send notifications specific users identified unique id.

can please explain how it?

 

to generate unique id each user installs app can use code:

code:

 + (nsstring *)generateuuid {   cfuuidref uuid = cfuuidcreate(null);   cfstringref idstring = cfuuidcreatestring(null, uuid);   cfrelease(uuid);   return [(nsstring *)idstring autorelease]; }  //add keychain - (void) blah {   [sskeychain setpassword:[self generateuuid] forservice:@"your.bundle.identifier" account:@"user"]; } 

from on can retrieved keychain using:

code:

 - (void) blah {   nsstring*uuidstring =[sskeychain passwordforservice:@"your.bundle.identifier" account:@"user"]; } 

that uuid same across user's devices assuming use icloud keychain, or if new phone , restore backup stay same.

more interesting, generate random 32 character string alphanumeric characters, add unix timestamp (a number representing milliseconds since january 1st 1970) end of string. apply sha-256 hash it. have totally unique identifier.

here's favorite method using sha-256 produce hashed string:

code:

 #include <commoncrypto/commondigest.h>  -(nsstring*) sha256:(nsstring *)clear{     const char *s=[clear cstringusingencoding:nsasciistringencoding];     nsdata *keydata=[nsdata datawithbytes:s length:strlen(s)];     uint8_t digest[cc_sha256_digest_length]={0};     cc_sha256(keydata.bytes, keydata.length, digest);     nsdata *out=[nsdata datawithbytes:digest length:cc_sha256_digest_length];     nsstring *hash=[out description];     hash = [hash stringbyreplacingoccurrencesofstring:@" " withstring:@""];     hash = [hash stringbyreplacingoccurrencesofstring:@"<" withstring:@""];     hash = [hash stringbyreplacingoccurrencesofstring:@">" withstring:@""];     return hash; } 

personally dislike php , prefer node.js things this. there push notification libraries out there node.js make incredibly easy.

make sure make easy turn off push notifications app. don't make users go settings > notifications, make easier that. , don't send many notifications (try stay below 1 notification per every 4-5 days), unless making messaging platform or push notifications crucial. after all, apps send many push notifications users tend uninstalled pretty quickly, , users resent they'll give app 1 star review.

more interesting tactic use a/b testing. it's pretty easy implement. send 2 (or more) versions of same push notification users, , can learn sorts of things users more engaged.

 

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