What Is the Impact of the "Requires Full Screen" Option in Xcode for an Iphone-Only App

What is the impact of the Requires full screen option in Xcode for an iPhone-only app?

There is no impact at all. Apple engineers thinks that its not required to hide, or may be Plus phones will get landscape slide over in later iOS versions :)

From the documentation:

To opt out of being eligible to participate in Slide Over and Split View, add the UIRequiresFullScreen key to your Xcode project’s Info.plist file and apply the Boolean value YES.

What's the difference between Requires full screen and Hide status bar

Hide status bar

The name of the check box is pretty self explanatory.
To hide the status bar from your apps launch screen you need to tick the Hide status bar checkbox under the Project Target > General > Deployment Info

Requires Full screen

IOS 9+ supports resizable apps with multi-window support. Unless you are re-writing your app to support multi-window, you will be requiring 'Full screen'. This is a hint to iOS that you do not support multi-window, and basically makes iOS 9+ work like previous versions in this regard.

How to turn off Requires Full Screen option in iOS using Cordova 6?

I would use the Cordova Custom Config plugin

With that plugin, you can pretty much change anything on the plist or manifestfile via the config.xml

So in your case, after installing the plugin, just add:

 <config-file parent="UIRequiresFullScreen" platform="ios" target="*-Info.plist">
        <false/>
 </config-file>

in your config.xml

iOS 9 : Warning All interface orientations must be supported unless the app requires full screen for universal app

The solution to this is to use "Device Specific Keys":
https://developer.apple.com/library/content/documentation/General/Reference/InfoPlistKeyReference/Articles/AboutInformationPropertyListFiles.html#//apple_ref/doc/uid/TP40009254-SW9

Your plist values would therefore look something like:

<key>UISupportedInterfaceOrientations</key>
<array>
    <string>UIInterfaceOrientationPortrait</string>
    <string>UIInterfaceOrientationPortraitUpsideDown</string>
</array>
<key>UISupportedInterfaceOrientations~ipad</key>
<array>
    <string>UIInterfaceOrientationPortrait</string>
    <string>UIInterfaceOrientationPortraitUpsideDown</string>
    <string>UIInterfaceOrientationLandscapeLeft</string>
    <string>UIInterfaceOrientationLandscapeRight</string>
</array>
<key>UIRequiresFullScreen</key>
<true/>
<key>UIRequiresFullScreen~ipad</key>
<false/>

When I remove the iPad specific version of the UIRequiresFullScreen key, I lose the full split-screen functionality - only "slide over" is available because that doesn't affect my app's use of the full device screen.

The "Device Orientation" checkboxes are for the default plist values. The only way they wouldn't affect the app on the iPad is if there's a more specific value in the plist, therefore a value specifically for iPad.

When the system searches for a key in your app’s Info.plist file, it chooses the key that is most specific to the current device and platform.

The app is not showing on full screen on iPhone but is running fine on the simulator

Add a splash screen. It will solve your issue. The top & bottom black color is because you didn't added a splash screen. Add it & it will return to a full screen view. This happened because you have migrated the project which developed in an older version of xcode

Unable to start my application in full screen on iPhone 6.0 Simulator Retina 4 Inch

Make sure that key window has proper size. Workaround is to set proper frame: [window setFrame:[[UIScreen mainScreen] bounds]].

Update:

It is difficult to guess where is the problem without having the source code.
I've created simple app stub to test interface orientation for iPhone4/iPhone5. I just created new "Single View Application", added some subviews to the root view, and added "Defaults" images. I did it in Xcode 4.3.2 without any extra features of Xcode 4.5. And app automatically stretches its screen to proper size (for both portrait/landscape orientations).

Xcode 7 ERROR ITMS-90474: Invalid Bundle, can't submit to Apple

Checking Requires full screen under Deployment Info in Project's General tab will solve this issue.

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