UIWebview caching to disk

2
votes

I have a simple iOS app that loads and list of links and presents them in a UIWebview. The app, when installed, is ~2MB. After clicking around through some of the links, I noticed that the disk usage of documents and data jumped to over 10MB. As a couple days went on, I noticed the disk usage continued to grow. My question is, what is the best way to manage disk storage on iOS?

The goal of this app is to be very minimal and not heavy on resources, but I'm concerned that it will continue to consume more and more disk space with, what I assume is, cached web content. Should I / is there a way to set a cache size? Or does iOS just handle this for me and delete old data eventually?

2
iosobjective-cuiwebview

2 Answers

2
votes

Do not optimize prematurely! Resources on disk put no strain on RAM memory, so don't worry about it. If the system is managing caching for you, it is not up to you to guess what it will do. If it needs to clear space, it will presumably clear space. Don't worry, be happy.

Now, having said, you do get some control over a NSURLRequest caching policy. Look at the NSURLRequest docs to learn more about that.

2
votes

Specify cache size:

int cacheSizeMemory = 8 * 1024 * 1024; // 8MB
int cacheSizeDisk = 32 * 1024 * 1024; // 32MB
NSURLCache* sharedCache = [[NSURLCache alloc] initWithMemoryCapacity:cacheSizeMemory diskCapacity:cacheSizeDisk diskPath:@"nsurlcache"];
[NSURLCache setSharedURLCache:sharedCache];

Remove all stored cached URL responses:

[[NSURLCache sharedURLCache] removeAllCachedResponses];

Hope to be useful to you!