Is there on-disk cache available on iPhone?

Question

I found a project to improve the cache strategy on iPhone. Cos they are sure: "On iPhone OS, Apple did remove on-disk cache support for unknown reason"

I found there are two db files on folder"Library/Catches/com.company.appname/" with UIWebView app:

ApplicationCache.db, Cache.db

and try those sqls

"select * from CacheResourceData", after opening ApplicationCache.db

"select * from cfurl_cache_receiver_data" on Cache.db

Both are cache file content on the disk

So now I am confused, Who can tell me the truth and the evidence?

if u access that database your application might get rejected — Paresh Navadiya, Aug 29 '12 at 08:17
NSCache always saves in memory. NSURLCache has a different storage policy. — Felix, Aug 29 '12 at 08:23
@phix23, I try to set a big Capacity with [NSURLCache setDiskCapacity:1024*1024*50]; so will it cause some problems, or affect the cache performance? — meadlai, Aug 30 '12 at 03:34

score 2 · Accepted Answer · answered Aug 29 '12 at 08:16

2

answered Aug 29 '12 at 08:16

Fabian Kreiser

score 1 · Answer 2 · answered May 17 '13 at 05:23

ApplicationCache.db is used to cache HTML5 cache, and Cache.db is used with NSURLCache.

[[NSURLCache sharedURLCache] removeAllCachedResponses];

sets Cache.db empty. (Browse and see from Finder while using iOS simulator)

If you delete ApplicationCache.db from your directory HTML5 cache gets lost.