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Newbie subscription questions

When an iOS app is launched, how does it learn that its subscription (or free trial period) is no longer active? Must the app poll the App Store every time it's launched?
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by vonlost.
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IPod too small for my app

My app works fine on any iPhone and iPad, but the poor iPod screen is just too small (I can't scrunch it down any more). What do I set to tell the App Store that an app doesn't run on iPod? I haven't found an AppName-Info.plist item for this purpose. Thanks.
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by vonlost.
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Trying to add LaunchScreen.storyboard

I have a working Main.storyboard and want to add a launch screen. I followed the tutorial at https://stackoverflow.com/questions/31676901/ios-8-launch-screen-storyboard-appears-black-single-xib-file-works-fine/65693691#65693691 and got my launch screen working, except that it hangs and doesn't progress to Main.storyboard. Is a navigation controller (which I haven't added) required to move from LaunchScreen to Main, or is some setting wrong that causes the hang (and what might it be?)? Thanks!
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by vonlost.
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No signing certificate "iOS Development" found

After an upgrade of some kind (Xcode, iOS, ??) my app no longer loads onto my iPhone 11. I generated a new development.cer and double-clicked it. What's the next step to get my app to run on iPhone? It has been working for years, but no more. It runs fine in the simulator. Thanks.
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by vonlost.
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Adding png to ImageView causes black screen

My app works properly, but adding Launch Screen.storyboard, all is fine up to and including adding Image View to View; I still see the background color of View and my annotation. But when I select my photo IMG_1486 (which is file IMG_1486.png) in Image, the screen turns black. The png is fine; I can point Main.storyboard to it and it shows up correctly. What settings can cause the black launch screen in this scenario? Thanks.
Posted
by vonlost.
Last updated
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