UI doesn't fill in iPhone 6 plus - ios

I'm working on an iOS app and realize the ui is not auto stretch to fit the screen when it's running in iPhone 6 plus.
So the UI is on the right left, and there are a lot of white space in the bottom and right.
If I set the width of a view to beyond 320 (ex. 400), then the view be wider than 320.
How could I make my views auto stretch to fill the screen?
I have a few other apps, and they works perfectly fine in iPhone 6 plus.
I couldn't figure out what make this app's ui not auto stretching.
The only difference I could think of it this one is create after the official xcode 6 is released, the others were created in xcode 6 beta version
Thanks!

Seems like you enabled native resolution for iPhone 6 Plus. If you delete "launch screen file" you can individually control which screen size will be supported as native resolution by adding related size of launch images.

You should start using auto-layouts. Start from here: Auto layout guide

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Xcode 8 AutoLayout/Constraints: Changing view to fit each Iphone screen size?

I am new to Xcode, and have been trying to figure out how to use AutoLayout and constraints. Long story short, after I hit 'add missing constraints' the Iphone 7 screen looks just as I intended, but both the Iphone 7 plus and Iphone SE screens look completely screwed up. What can I do to fix this so that every screen looks like the Iphone 7?
Iphone 7
Example Iphone SE (screwed up)
add missing constrains option means: adds the constraints needed to have a nonambiguous layout. may not work well for all iOS devices, and may not work well for device's rotation changes or view size changes, so, check view's constrains in size inspector panel
for more info:check Apple's auto layout guide

Layout missed up on 3.5" Screen iPhone 4

I have developed my App on XCODE 8 which by default removes iPhone 4 emulator and I didn't notice that until I finished my app, and I used Auto layout to make the UI fits all iPhone screens and that what happened (the layout was good on iPhone 7,6,5) the problem is when I additionally installed iPhone 4 emulator I found that the layout is totally missed up and unreadable/usable.
So what options do I have to solve this and make it fit the iPhone 4 screen too with Auto-Layout with missing up the other sizes ?
Here is screen shot of my Login screen on iPhone 6 (4.7") vs iPhone 4 (3.5")
You must always give constraints with respect to other alternative buttons or a view, it should not be hard coded. Try making views programatically, it will be more easy and helpful to you.
It seems like your constraint is set to have a fixed distance related to the top of your screen. So when the screen height get smaller, your views are pushed out of the screen. So to better adjust views position, you can have your views to be related to vertical center. Say your login box is in both horizontal and vertical center, not metter you are using iphone 6 or 4, you should always see your login box.

How to efficiently use Autolayut and Auto-Resizing in same target?

I have one target. It's a login based application. Because of legacy code, I am forced to use Auto-Resizing in some View Controllers whereas I have updated newer UI using Auto-Layout.
If the Autolayout has to work on iPhone 6 and 7 (4.7"/5.5" screens) I have to add the launch images for these.
PROBLEM:
All my screen that are not using auto layout gets disturbed when I add the Launch image.
If I don't use the launch screen images, all the View that use auto layout are scaled up and appears slightly bigger than expected.
I do not have the luxury to update the legacy code to use auto layout.
Can someone please give me an alternative or a work around.?
If I don't use the launch screen images, all the View that use auto layout are scaled up and appears slightly bigger than expected
Correct. This is because, without the launch screen, your app is no longer compatible with devices like the iPhone 6 and 6 Plus. To compensate, the app is treated as if this were an iPhone 5 and is shown in zoomed mode.
So if you want to run at native resolution / size on iPhone 6 and later, you must have the launch screen. That being so, setting up your interface to deal with the larger size is up to you. You do not have to adopt auto layout; autoresizing still works fine. (However, using auto layout would be better.)

ImageView Scaling for iPhone 6 and 6+

So Im making a game without the use of auto-layout. I have used constraints to scale everything and it worked perfectly. However, there are 12 image views that scroll down. 6 on the right a 6 on the left.
This is done based on a code i've written and places the images via arc4random.
The images on the left are completely fine and scroll down so that there is no gap between the side of the screen and the image. As do the images on the right when using the iphone 4s and 5.
HOWEVER.. when it comes to trying this on the iphone 6 and 6+, alot of the times, there is a gap between the image and the side of the screen on the RIGHT. the LEFT is fine. I want to know how I could solve this issue. This is more of a general problem so dont need to include code.
You can try disabling iPhone6 and iPhone6 Plus support for the app so that they work fine on the new devices (via scaling)
Remove "Launch Screen File" from Target General Settings and if you are using Asset Catalogs for Launch images, under right panel for the asset catalog under Launch Images-> remove launch images for iPhone Portrait and Landscape for the category 'iOS 8.0 and later'
This is a workaround that makes iPhone6 and iPhone6Plus to scale views according to the screen size.

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Auto-layout works perfectly when I'm testing on ios8 devices, it the view scales as needed.
However, things get a little crazy with ios7.
When I test my app on an ios7 iPhone 5 simulator, the app doesn't scale-up to the larger screen,
but only shows the 3.5 inch view, leaving black bars on the top and bottom of the screen.
I am using a tableView controller.
How do I scale the tableViewController up so that it fits on a larger screen in ios7?
(Like I've said, my app fits perfectly in ios8, on all screen sizes, but not in ios7.
Also, it scales fine on an ios7 ipad.)
thanks.
The Xcode (6) IDE should give a warning about this, that may not be so clear:
"Applications using Launch Screen Files and targetting iOS 7.1 and earlier
need to also include a Launch Image in an Asset Catalog."
This means you need to have the proper Launch-Images for the "Retina 4" screen,
which is 640 × 1136 pixels, and it should be configured in the assets-catalog,
just like your Application-Icons ("AppIcon"), but under "LaunchImage" there.
Once you add this 4-inch-compatible Launch-Image to your application,
iOS-7 will assume you are properly supporting the "Retina 4" screen,
and will launch the application in 4-inch mode.

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