Must app be tested for all iphone sizes for approval

Question

am newbie in iOS app development. say, I have created an iOS Swift 3.0 App for iphone 6/6+ (7/7+) I build Swift app for iphone 6/6+ (same as 7/7+). This means I use the standard Screen size 375x667 to start with.

In Xcode 8.2.1, there is a list of Devices from iPad to iphone 4s which you can use to test to see how your app fit into the targeted devices.

1) I started on iphone 6 (same as iphone 7), my app fit in and look good for this screen size. When I tested it on iphone 4, my App wont fit in; some UI control like TextView is missing. Must I fit my app for this iphone 4s?

2) The same app can fit in ipad (pro 9.7, 12.9 inch) but the UI control will look small.

I need your help for the following questions for app store submission.

a) It is a must that my app must fit in for all the screen size such as ipad and iphone 4s when I started out the app on iphone 6 or 7?

b) Can I just target iphone 6 and above?

Thanks

Answer 1

There is no explicit setting to target only the iPhone6 and above, rather Apple will frown over this and would not encourage it.

But by doing the following, you can target only iPhone5 and above.

1. In the Project --> Target --> General --> Set the targeted devices only to iPhone instead of iPad/Universal.

2. Again in, Project --> Target --> General --> Set the deployment target to iOS 10.0.

As iOS 10 does not support iPhone 4s and previous devices you can get away with this.

Also, iOS 10 adoption is already about 80% as reported on Jan 4th, 2017. So you are already targeting most of the users.