Question

After uploading the iPhone App to the Appstore, how will the appstore handle the version compatibility of the devices ?
For example “Twitter” app, when clicking on “Install” it pop ups up with message saying “App is compatible in ios5”
How can this be done in my iPhone Application which I’m going to upload in AppStore ?
Will this be done by APPLE or do we need to code from our end.

Answer 1

Whenever you are using classes from a new SDK version and you are targeting an older versie of the OS you should check at runtime if a class is available.

For example:

if (NSClassFromString(@"TWTweetComposeViewController") != nil) {"
     TWTweetComposeViewController *twViewcontroller = ....
} else {
     // Some other twitter library
}

This is the save way to check support for a specific class.