Zooming the screen programmatically - objective-c

I'm looking for some code which can programmatically zoom the screen in OSX. Similar to the way you can use Accessibility controls to zoom the screen using keyboard shortcuts (e.g. Option-Command-Plus Sign to zoom in). But I'd like to enlarge a pre-defined part of the screen.

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Continuity camera contextual menu issue

The contextual menu in one NSTextView in my app does work and imports a sketch made on my iPad / iPhone.
My problem is that when another of my app's windows is visible, the contextual menu in its NSTextView does not connect to the iOS device.
Also, when this second window is visible, the menu no longer works in the other window.
I posted a screen recording to YouTube here: https://youtu.be/qWMUGdL7O8g
I tried changing firstresponder to no avail.

Interactive tap-and-hold modal like Instagram? in react native

Instagram has a really cool interaction where you can tap-and-hold, aka longPress, on an image and an interactive pop-up appears. Once it appears you can drag your finger to one of the action buttons and removing your finger applies the action and closes the pop-up.
Like this effect
How can I achieve this.

How can I set background image when half of app screen slides down for the behavior double tap the home button?

I'm finding a way to set a background image when half of app screen slides down. for the behaviour double tap the home button. Can anybody give me some help for this?
That area is not part of the application, but rather a view placed by the operating system.
Think of the double tap as a mechanism for the OS to "shift" your app down for easier access.

How to maintain background screen at same position when pop up window gets added?

I am developing a windows phone app, and I have added a popup control in it, its working fine
Problem: When popup window comes on screen the background screen changes its position and go to bottom.
How to fix this issue? How to maintain position of background screen while using a popup?

Finger scrollable UIWebView when the keyboard is up

In an application that I'm writing I have a UIWebview up top and some UITextFields at the bottom that I want the user to be able to type in depending on what's in the webview. But when they touch the Text Field and the keyboard pops up, the user loses the ability to manipulate the web page to see different parts.
Is there a way to keep the keyboard up and still be able to manipulate the UIWebView?
No I believe the Keyboard is modal so you can't access the form underneath it.
You can respond to the
- (void)keyboardWillShow:(NSNotification*)aNotification;
- (void)keyboardWillHidde:(NSNotification*)aNotification;
notifications and scroll the View up or down when the keyboard is shown...
Example here