Clearing UIWebView Cache on ios

Question

I have a Phonegap App where I need at some point to remove the html cache because I have updated the images in my app.

I have tried this :

[[NSURLCache sharedURLCache] removeAllCachedResponses];
[[NSURLCache sharedURLCache] setDiskCapacity:0];
[[NSURLCache sharedURLCache] setMemoryCapacity:0];

Called in a plugin via javascript, the i do :

location.reload( true )

But I still see the same image that seems to be cached.

Is there another way of doing this ? I can tell the user to quit the app and kill it and relaunch it after.

Thanks !!

can you Please tell us which version of CORDOVA you are using? We are having issue that UIWEBVIEW clears the Caches as soon as application exits. So when I run the application Next Time With WIFI off. No image appears. [Please see our query Here](http://stackoverflow.com/questions/19446317/ios-phonegap-application-ignoring-cache-headers-and-not-caching-images) — abksharma, Oct 21 '13 at 10:17
I think it's the ios behavior to clean the memory once the app is shut down. — arlg, Nov 20 '13 at 21:39

score 0 · Answer 1 · answered Sep 05 '13 at 17:51

0

What you can try is to completely remove the cache directory in your app for example at the very first start of the app

answered Sep 05 '13 at 17:51

oiledCode

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score 0 · Answer 2 · edited May 23 '17 at 12:25

You Can have URL versioning system for images. As I have mentioned here.

http://www.abksharma.in/2013/10/caching-using-javascript-versioning.html

request images with below URL param.

http://s.wordpress.org/screenshots/3.5/ss5-dfw.gif?1
http://web-sniffer.net/
Above is truly cached image with below headers

For DATA we can Use below.

How to Enable ajax request caching for semi dynamic data (ie JSON)?

score 0 · Answer 3 · answered Jun 12 '16 at 08:12

You can simply solve this by add timestamp after the url.Then you can make sure that the url you request everytime is different.

Just like this:http://www.demo.com/xxxx?t=timestamp.

The javascript code just like this:

var url = 'xxxx/xxx?timestamp=' + Date.now();

score 0 · Answer 4 · edited May 23 '17 at 11:53

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None of these helped me.

I was afraid I was going to have to resort to generating unique file names and cleaning up when done.

This worked great.

<img src="data:image/jpeg;base64,iVBORw0KGgoAAAANSUhEUgAAABkAAAAZCAYAAADE6YVjAeu
... snip data ....
YII=">

How to display Base64 images in HTML?

edited May 23 '17 at 11:53

Community

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answered Mar 09 '17 at 22:47

Ed of the Mountain

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Clearing UIWebView Cache on ios

4 Answers4