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POMaking Apple-hosted in-app purchase content download by WiFi only
 

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    <p>I have a large (>1GB) in-app purchase that I want to deliver using an Apple-hosted download. The Apple docs say the Apple-hosted IAP content doesn't have a limit to the size that can be downloaded on a cellular connection. I'd like to be able to ensure the purchase is only allowed when connected by WiFi. </p> <p>There's the possibility that during download the user might walk out the door and transition to cellular. At that point I'd like to pause or cancel the download until WiFi was available again.</p> <p>I raised a TSI and Apple's response was "Our engineers have reviewed your request and have concluded that there is no supported way to achieve the desired functionality"</p> <p>It seems feasible to use <a href="https://developer.apple.com/library/ios/samplecode/Reachability/Introduction/Intro.html" rel="nofollow">Reachability</a> to check the connection type before starting the download and use the observer delegate during the download to make sure the phone didn't switch to cellular.</p> <p>Will this work reliably? Is there a better way to do this?</p> <p>Also in terms on maintaining control as the download proceeds, it's not clear from the Apple docs if the Apple-hosted download that runs in the background is in my app's process, or it happens out of process. In other words, if my app is terminated, is the download guaranteed to be stopped or does it continue outside my app's control? </p> <p><strong>Update:</strong> With the benefit of some experience, the question is somewhat moot. Continuous download of data requires that the phone has a WiFi connection and external power. Without these, the download gets paused a little while after the screen powers off - phone's power management I guess. Also the IAP download is out of process, it continues even of your app crashes (explicitly killing the app stops the download though). When your app restarts the StoreKit delegates are called to complete the download and purchase.</p>
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    1. COPlease don't. Show the user a warning that the download is enormous and let them decide. But don't simply disallow downloading it over cellular.
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    2. COWell that's one way of looking at it. The way I look at it is the consequences of a user not reading the warning or, more likely, forgetting a download is in progress and leaving wifi can be so severe, I don't want to go there if I can avoid it. Cell overage charges are $100-$500/GB in many places and international roaming charges can be over $10,000/GB. Google will give you a sense of the intense emotions this generates
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    3. COApple disallows large (over 50MB) app downloads over cellular. I don't see applying the same logic to very large in-app purchase content as anything different.
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