react-native background color below app / view - react-native

There is a white area on larger phones (not present on SE for example) below my application, it is a bleed area I believe, and it is white, I would like to color this area in my app, is this possible? I have seen some posts that this must be done in xcode, but I wanted to confirm that, my current build chain doesn't touch xcode and is entirely in expo.

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ios8 and iPhone 6 Plus Tab Bar Size

I am bulding an iOS8 app and i have noticed that on the iPhone 6 Plus my TabBars and Navigation bars are bigger than the stock Apple apps. I cant seem to find any documentation for this. How do i tell my top and bottom bars to resize for the bigger iPhones?
The screenshot below shows Maps next to my app. (Amended to show clock app instead.) I am pretty sure the clock app uses a TabBar Controller and not a toolbar as suggested below.
Do you have a proper Launch Image for the higher (#3x) resolution for the iPhone 6+? If you don't you're app is going to get scaled, which is probably why it looks bigger. Run your app with the debugger on an iPhone 6 Plus and look at the value of UIScreen.MainScreen.Scale. If it reports back "2.0", then you don't have a proper launch image for your app, the resolution is being scaled. Once you have the proper launch image, UIScreen.MainScreen.Scale should report back as 3.0.
As J2K said to you, your tab and navigation are ok. Apple Maps app uses searchbar at the top and toolbar at the bottom which are smaller. Don't waste time on this, ios will handle the size for this elements for you in all iphone sizes

ios7 - control the design of the camera app from my app

I am building an app that in some point refers to the camera app to take a picture, and then comes back to my app with the picture.
when I go into the camera app, can I redesign it?
for example- can I change the color of the buttons from white to red?
thanx.

Recreating the iPad home screen icon rotation / orientation effect

I am creating a grid of icons in Objective C / Xcode.
Is there anyway to re-create the iPad Home screen, the one filled with a grid of icons for each App you have on your iPad.
What I am most interested in is reproducing the effect on the icons when the device is rotated. On rotation, a new grid icons (which matches the new orientation) swings around to the right orientation, and the icons themselves transform (I'm guessing its an alpha fade from one icon to the other) into the new icon that would appear at that position.
Ive looked at this SO question, and also at this blog. But I am wondering if there is a class (hopefully one developed by Apple, but third party solutions will do) which recreates this effect?
If there isn't such a class, can anyone suggest to me how I would do the icon transformation effect whilst the screen is swinging around to the correct orientation?
iOS 6 offers a class called UICollectionView that handles the creation of these grids for you. The API is fairly similar to that of UITableView and allows you lots of control for customization.
Check out the UICollectionView class reference, as well as this introductory tutorial.

How do I position in mono for android?

Hello i am new to Mono for android. I am trying to make a Calculator, in a normal windows forms application.
I can Drag a button or textbox to any position I want but how does that work in Mono for android, I want the buttons next to each other not only downwards. If I place buttons under eachother that go out of the framework I dont want that either..
I am not English il hope you will understand.
please help.
Android "supports", but has deprecated and doesn't endorse, pixel-perfect layout. Unfortunately the Windows Forms-style of dragging and dropping controls onto a design surface at specific pixel locations requires pixel perfect layout, so you can see the mismatch here.
For a Calculator, what you would instead want to do use a Table Layout or some other "resizable" container, so that your Activity can support the variety of device sizes that Android covers.

How do I change the color of TableView and Button controls in iOS?

I designed a web app for iPhone and am now trying my hands at a native Objective-C version, and I'd like to retain some continuity with my original design. Since my web version uses CSS, I was able to customize the color palette, even though the UI was designed to imitate a native iPhone UI. I'd like to use a similar color scheme for my native app, but it doesn't seem so easy out of the box. I've gone through a couple tutorials and played around a bit with Interface Builder, inspecting the individual settings available for each control. My biggest questions are:
Is it possible to (or how do I) change the color of a Round Rect Button?
Is it possible to (or how do I) change the color of cells in a Table View?
Where in the Cocoa Touch Library can I find the standard iOS UI buttons, e.g. the green "Call Back" and red "Delete" buttons in the native voice mail?
Thanks
Nope, I don't think so. And you probably shouldn't anyways. In my opinion it's better to rather stay consistent with the OS and not the web... What you can do is to use a custom image.
UITableViewCell has a property named backgroundView, which is only present if you have a grouped style. This view has -- just like every other view -- a background color. If you don't have this and want to color individual cells, build a custom cell where you put in a view as background view.
As far as I know, they are not publicly available. However, you may find a lot of template images etc on the web that you can use.