Using ios 6.1 sdk with ios8 - ios

I have installed the ios 6.1 sdk in xcode 6 and it shows up in my base sdk drop-down.
I selected it and the app builds but when it launches on the ipad (ios 8) it seems to have a very broken apperence as if its trying to use ios 8 sdk. In ios 7 we were able to use the ios 6.1 sdk on ios 7, is this ability totally removed in ios 8?
This is an enterprise applicaiton, and the client is trying to avoid paying from a full refresh to ios 8.

Dropping an old SDK into a newer copy of Xcode is untested and unsupported by Apple, and it's no wonder you're seeing the problems you're seeing.
If you want to support an earlier version of iOS while using the latest SDK, just set the Minimum Deployment iOS version in your target's build settings (as described here in the Apple documentation I've included).
p.s. On the other hand, if you really want to keep using the iOS 6.1 SDK... use the Xcode version the SDK came with. And it should hopefully look proper under iOS 6, and it'll look like an iOS 6 app under iOS 7 & iOS 8.
p.p.s. Your client is cheap.

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Which swift version for iOS 7+

I'm new to iOS development, trying to develop an application.
Once I've seen in these statistics that iOS 7 has a really small market share I decided to support iOS 7 or higher in a way to make an app to all iphone OS available in the market. I also decided to use swift as code language but not sure which swift version should I choose.
Which swift version should I choose for iOS 7 or higher development?
Apple states that
Starting July 2018, all iOS app updates submitted to the App Store must be built with the iOS 11 SDK and must support the Super Retina
display of iPhone X.
(The same requirement for new apps started on April 2018.)
So, your choice are very few, Xcode 9 (with iOS 11 SDK) or Xcode 10 (with iOS 12 SDK).
(I believe we should read the requirement as iOS11 SDK or later.)
And supporting iOS 7 with Xcode 9/10 is very difficult. (I do not know if it is possible or not.) Deployment Target does not accept versions less than 8.0 (*), and iOS 7 Simulators are not provided.
(*) Some versions of Xcode replaces versions less than 7.0 to 8.0, even if I entered the version number manually. And at least, both Xcode versions does not show 7.x in the popup menu of the Deployment Target.
I recommend you to use the latest released version of Xcode (10, which comes with Swift 4.2), and make your minimum supported version to iOS 8.0 or later.
The Swift application will work only on iOS 7+. The Xcode will add the Swift library to every build so, you can use any version of Swift language and all of them will work on all iOS starting from 7th. Apps created with Swift will run on iOS 7+ and Mac OS 10.9 +
so use the latest version always.
You have to use the latest swift version Swift 4.2
As iOS 12 is out now so you have to use iOS 10 and above because we should support recent 3 versions.
Images source
If you target iOS 10 and above then you hit the 95% users

can Xcode & iOS version affected on old project(which is created on Xcode 7.2 iOS 9.0 objective c)?

i dont know about Xcode 8,9 can it support objective c old functions and project?
my project is almost complete but some kind of function not supporting like UIDocumentBrowserViewControllerand etc in iOS 9.0 should i upgrade only iOS version or Xcode also Please anyone help me understand that iOS stuff.
thank in advance
If you intend to ship the app to the App Store, always keep your Xcode updated. You cannot test iOS 11 using Xcode 8.x.
Also, according to Apple's docs UIDocumentBrowserViewController is in iOS 11.
From Apple official site, for app store submission:
Starting April 2018, all new iOS apps submitted to the App Store must be built with the iOS 11 SDK, included in Xcode 9 or later. All new apps for iPhone, including universal apps, must support the Super Retina display of iPhone X.
Updated guideline of App store submission
Your app should be compatible with 64-bit support.

Can I still develop apps for iOS6 in 2017?

I'm using XCode 8.2.1 and see that the earliest SDK it allows me to use is iOS8. I have a couple ideas for apps that use dedicated older devices (iPod 4/iPhone 4), and would like to use iOS6.
Is developing for iOS6 still possible in 2017?
Would apple accept apps developed for iOS6 to the App Store?
Can I download iOS 6 SDK within XCode8 or do
I need to download earlier version of XCode?
sorry, but iOS 6 is deprecated
you can develop iOS 6 application in Xcode 5 or 6, but you can't publish your application

Xcode 8 no support iOS 7

I've upgraded my Xcode to Xcode 8. Now I notice that I cannot run/debug on an iPhone with iOS 7.n.n. I've have read that it isn't supported in Xcode 8. I do know that my app will still work on iOS 7, but if something fails I would like to hang it on Xcode to debug it. So my question is:
Do I still get the bug fixes/improvement that were introduced in iOS 10 when submitting my app with a base sdk setting of iOS 9.3?
Xcode 8 (or even Xcode 7) doesn't include support for iOS 7 simulator, which is what I think you're really asking about.
To pick up the new iOS 10 SDK changes, link against the iOS 10 SDK and then set your target's minimum deployment version to iOS 7.
If you were using analytics, chances are very high that you'll find the number of iOS 7 using customers is incredibly low.
Do I still get the bug fixes/improvement that were introduced in iOS 10 when submitting my app with a base sdk setting of iOS 9.3?
No, of course not. If you do that, you are still an iOS 9 app. You must link against iOS 10 if you want to run natively under iOS 10.
However, you can do that and still be backward compatible to iOS 7. And you can easily test on an iOS 7 device, so the change to Xcode 8 does you no harm.

Use pre-iOS 7 look and feel on iOS 7

How is it possible to use your pre-iOS 7 look and feel for your app? I just upgraded to iOS 7 and I have some apps on the phone that are still using the pre-iOS 7 look and feel. For instance one app is using the old UIPickerView look but it's running on iOS 7.
When I tested running the app that I am developing on the iOS 7 simulator it's using the new UIPickerView "automatically" without me doing any changes.
So I'd rather that my app uses the pre-iOS 7 look and feel until I have upgraded my app for iOS 7.
Here's an image of running Checkmark on iOS 7, you can clearly see it's using the pre iOS 7 keyboard:
That's rather simple: You have to build your app using the iOS6 SDK. iOS 7 detects older apps by checking the SDK against which the app was linked.
You can switch "Base SDKs" in Xcode by selecting the target, switch to the build settings tab, and find the "Base SDK" build setting under "Architecture".
If you don't have an older SDK you may need to use an older version of Xcode (4.6). Rob Napier describes here how to point a newer Xcode to older SDKs.
Note that while many UI elements retain their iOS 6 look, some don't (UIAlertView, UIActionSheet).
If you're using the standard UI components you're going to automatically get the new style on iOS 7, there's no way I've come across to force them to appear as they would in iOS 6. The only way you're going to be able to have them appear as iOS 6 elements is to build custom elements and style them yourself, however there's a risk in doing that that when you submit to Apple they'll reject on the basis of breaking the HIG.
On a device running iOS 7, all of the system UI—such as alerts and notifications—uses the iOS 7 appearance, even if your app is currently using an earlier appearance.
From Apple transition guide:
https://developer.apple.com/library/ios/documentation/UserExperience/Conceptual/TransitionGuide/SupportingEarlieriOS.html#//apple_ref/doc/uid/TP40013174-CH14-SW1
Not only do you need to build your app using iOS 6 SDK or earlier, you need to use Xcode 4.6 or earlier. I just went through all of this and targeting iOS 6 SDK from Xcode 5 is just not enough.
Luckily you can dual install both versions of Xcode. Just download Xcode 4.6 and drop it in your Applications Folder and rename is to something else

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