i have to play a sound when an uibutton is clicked. My problem is that when device is with volume down, so user pull down volume in hw way, my sound will have volume down. Is there a possibility to have my sound with max volume though volume is down? I hope my answer is well formed
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Whether this is possible or not, it would be a very bad practice. Apps should always respect user’s choice, including volume. Think of a user that’s using your app in a very quite environment (e.g. hospital, airplane, etc.), so the user turns the volume down – yet your app still makes loud noises. I’m guessing this would rather alienate the user.
My guess is that normally it’s not possible though. Have a look at this article: http://developer.apple.com/library/ios/#codinghowtos/AudioAndVideo/_index.html – specifically, look for How do I control playback level? topic.