Enable/disable button depending on On Demand Resources tag

Question

I have some buttons linked to an IBAction that plays a sound.

-(IBAction)listen {
 // play the audio
}

My files are organized with On Demand Resources, and I have 3 tags:

level1
level2
level3

So what I'd like to achieve is:

if the user is on level 1, he will only be able to play files with the level1 tag. If he clicks on a level2 tag audio, an alert will appear.

How can I check if a file has a specific tag?

you cannot set tag values to objects. Only UI elements can be given tags. — Teja Nandamuri, Apr 28 '16 at 13:12
https://developer.apple.com/library/ios/documentation/FileManagement/Conceptual/On_Demand_Resources_Guide/Managing.html#//apple_ref/doc/uid/TP40015083-CH4-SW1 — fabdurso, Apr 28 '16 at 13:17
ohh ok, the tag referred in there is different than the tag value for the UI elements. Seems the tag value is a string in your case. — Teja Nandamuri, Apr 28 '16 at 13:18
As mentioned in the documentation, you can use conditionallyBeginAccessingResourcesWithCompletionHandler: method to check if the file exists in your device or not. As you are downloading the whole bundle resource but not just file, you need to provide the required tags to the sourceRequest and call that method. — Teja Nandamuri, Apr 28 '16 at 13:23
all the files exist in the device. the only thing is that, depending on their tag, the user will be able to play them or not — fabdurso, Apr 28 '16 at 13:51

score 1 · Accepted Answer · answered Apr 28 '16 at 14:41

1

I'm not aware of an API to access a resource's ODR tags, so you have to use some other way to map resources to access controls in your app code. Perhaps you can use pathForResource(_:ofType:) to inspect the path of the resource, and if it is in the directory "level2", prevent your user from accessing the resource until they are on the appropriate level?

answered Apr 28 '16 at 14:41

Palpatim

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so should I have to store my files on different folders in my project? – fabdurso Apr 28 '16 at 22:00
That would be one way to do it. I agree it would be convenient for this use case to know what tags are assigned to an asset, but that's a packaging-level detail. You wouldn't want your code to break if you stopped using ODR and started packaging all resources with the app, so it would be better to rely on a different mechanism instead of overloading the tagging mechanism in unexpected ways. – Palpatim Apr 28 '16 at 22:54
so if I have level1 folder, level2 folder, level3 folder, how should i check it? – fabdurso Apr 30 '16 at 18:16

Enable/disable button depending on On Demand Resources tag

1 Answers1