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How to kill/exit iOS application on a button click programmatically

I had been practising below code to kill an iOS application.exit(0);But last week, my application was rejected by app store due to following reason:

We found that your app includes a UI control for quitting the app. This is not in compliance with the iOS Human Interface Guidelines, as required by the App Store Review Guidelines.

To avoid any such rebuff, suspend the application using following code snippet.
UIApplication.shared.perform(#selector(NSXPCConnection.suspend))
Good news is that now my application is passed the iOS Human Interface Guidelines and live on app store.

How to speed up Xcode build time

Building time for My iOS app takes around 3-4 minutes when building the application from a clean state. A developer builds and runs the app many times per day to check his expressions, types, and syntax accumulating a lot of lost time waiting for the build to be finished by the end of the day.
In order to solve this issue, it is imperative to refactor the complex expressions that are taking too long to compile into more simple ones. To do this do the following steps: Enable -Xfrontend -warn-long-expression-type-checking=50 in Other Swift flags. This flag will issue a warning for every expression that takes more than 50ms to compile. Refer below Xcode screenshot for where to make changes in Xcode.Refactor the highlighted expressions that took more than 50ms to build. You can see the highlighted expressions in Issue navigator section.Enjoy faster build time. 

iOS accessibility issue - focus goes to a random position

Recently, I faced an issue where the Accessibility(ADD) control goes to random position after selecting a table section/row. On one screen where I worked, there was requirement of collapsing and expanding table header. When user tried to collapse/expand the header, the ADD control goes to random position.  Initially, I tried to post the accessibility notification to set the ADD control to specific section, but it didn't work. (Generally, In most of the cases it works) UIAccessibility.post(notification: .layoutChanged, argument: sectionInstance) Secondly, I tried to use the below method. By using this method, I get a callback when an element has ADD focus. When I get a callback, I scrolled the table to the desired position and then post notification, but sadly it didn't work too. override func accessibilityElementDidBecomeFocused() Finally, I used the default scroll method (scrollViewDidScroll) where I got the regular callbacks when table scrolls. When a section is collapsed/exp…