Top "Xcode9" questions

This tag should only be used for questions specific to the usage and features of Xcode 9. Do not use this tag just because you are using Xcode to develop your app.

Swift 4 ,must be used from main thread only warning

When I using Swift4in Xcode 9 gives me UIApplication.delegate must be used from main thread only .... must be used …

appdelegate swift4 xcode9
Swift 4 - Notification Center addObserver issue

I'm crashing and getting an unrecognized selector error every time a Notification arrives and the App tries to execute its …

swift nsnotificationcenter xcode9 addobserver
Enable code-folding by default

Is there a way to tell XCode fold methods/functions by default when opening a file?

xcode xcode9 code-folding xcode10
Xcode 9: Could not attach to pid

I've been facing an issue (frequently) with the recent major release of the iOS application development tool - Xcode 9-beta. …

ios xcode xcode9
How can I delete derived data in Xcode 9?

I have installed Xcode 9 today morning. It works fine but I want to understand the way to delete the derived …

xcode xcode9
What is NSFaceIDUsageDescription - Face ID Usage Description Info.plist key?

There is a new privacy NSFaceIDUsageDescription Info.plist key in the Xcode 9 GM where a developer supplies the usage description …

ios xcode ios11 xcode9 face-id
iOS 11 Layout guidance about safe Area for iPhone x

My application already in app store, yesterday i have updated my Xcode version to 9 and works fine except iPhone x. …

ios autolayout swift4 xcode9 iphone-x
Take screenshot in iPhone Simulator in Xcode 9

How can I take screenshot of size 1242 x 2208 (required for App Store) from iPhone 8 Plus simulator in Xcode 9.0? I can't …

ios xcode ios-simulator screenshot xcode9
Xcode can only refactor C and Objective-C code. How to rename swift class name in Xcode 6?

I have created a new Single View Application Project in Xcode 6 beta version. I want to rename swift class from …

ios swift xcode xcode6 xcode9
How to use swift 4 Codable in Core Data?

Codable seems a very exciting feature. But I wonder how we can use it in Core Data? In particular, is …

swift core-data swift4 xcode9 codable