Xcode Previews

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Create an app UI and configure almost everything your users see using Xcode Previews.

Xcode Previews Documentation

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Xcode 13 preview failed - The project does not contain a preview provider named "ContentView_Previews_", etc.

Hi folks, I downloaded the Xcode 13 and created a new project, named 2021107. After launching the program and without writing any code, the preview failed in the very beginning as shown in fig1.png. The error message shows the project '20211007' does not contain a preview provider named "ContentView_Previews_". It asks me to check the build settings to ensure the preview provider is compiled to the product. Since I'm a beginner in the Xcode, I'm sorry I'm not sure where the settings are and what to do to fix it. I click on the 'Try Again' to rebuild the preview and it failed again. I used to use the Xcode 12 to study the Swift language and I remember the Preview showed the 'Hello world' after launching the program. It seems the Xcode 13 is different. I'd be much obliged if anyone would help me with the problem. Thanks in advance! Additional information: [1] When I clicked on 'build', it succeeded. The simulator was launched without any error. [2] Fig2 shows the message when I clicked on 'Diagnostics' next to the 'Try Again' on the preview panel.
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by decus_sc.
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Previews Locale - not working

Try to modify Locale in previews, to see how it looks but it didn't work, Code: import SwiftUI struct SettingsView: View {     var body: some View {         VStack {             Text("Current Locale : (Locale.current.identifier)")             Text("Hoy es: (dateToString(Date()))")         }     } } struct SettingsView_Previews: PreviewProvider {     static var previews: some View {             SettingsView()                 .environment(.locale, Locale(identifier: "es_AR"))             SettingsView()                 .environment(.locale, Locale(identifier: "fr"))     } }
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by gmolluso.
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Xcode 12 Beta "Cannot preview in this file"

Hi there! I've been messing around in Xcode 12 Beta with SwiftUI and a Core Data Model, and for some reason my ContentView preview in Xcode is failing to load. Here's the error: "Cannot preview in this file — Connection interrupted: send message to agent" I've made sure all my target memberships are synchronized, given Xcode 12 Command Line Tools in Preferences>Locations, and tried every other solution I can find out there. Any ideas?
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by nlweeks.
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SwiftUI Preview: Updating took more than 5 seconds for non-main target (framework target)

While selecting a framework rather than the executable as the active scheme, SwiftUI preview cannot use: Updating took more than 5 seconds. However, while selecting the main app target, it can work perfectly. Repro steps: git clone https://github.com/imWildCat/NonExecutableTargetCannotUseSwiftUIPreviewDemo cd NonExecutableTargetCannotUseSwiftUIPreviewDemo xed NonExecutableTargetCannotUseSwiftUIPreviewDemo.xcworkspace Select the “SharedUI” target as the active scheme Open the WebImage.swift source file Run the SwiftUI preview Please note that, if you use the main app target (executable rather than the frame), it can be previewed.
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by WildCat.
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Re-Add iPhone X/XS/11 Pro "View As" for Xcode 12.5

Xcode 12.5 seemed to have removed the "View As" option for iPhones X, XS, 11. I have an iPhone X that I use as a test device for my apps and there is no equivalent preview size in Storyboards. This is so annoying! Anyone know a way to add an additional View size?
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Xcode and App Signer Issue

My Xcode seems to be working properly. However, when I am running IOS App Signer to convert my *.deb file to an *ipa file there are issues. Issue 1: IOS App Signer does not see a Signing Certificate Issue 2: IOS App Signer "Provisioning Profile" sees my IOS Team Provisioning Profile but the numbers in Parentheses does not match my Xcode Team Provisioning Profile in Parentheses. The 10 digit numbers are different in Xcode and IOS App Signer. The numbers beside my Profile in Xcode match my Keychain. But for some reason IOS App Signer does not see the correct profile and new numbers in parentheses. Also, I have a free account. Any help would be appreciated
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Debug Previews

I used to be able to "right click" on the play button for a preview, but in Beta 1 and 2 of Xcode 13 that isn't working (neither is control clicking). Any ideas how to debug a preview short of running app in the simulator?
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Canvas overload cpu - Xcode 13

Hello, canvas uses my cpu (kernal_task 100 %) on iMac 2017 too much and can not display preview of some of my views. On my MacBook Pro everting is running well. Are there some solutions for this? Like setup new my iMac2017 ...etc. Thanks for help!
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by Rob85.
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SwiftUI Preview fail with Core Data: "Error Domain=NSCocoaErrorDomain Code=516"

Hello, Since I added Core Data to my SwiftUI project, preview canva is no more working, showing an error explaining that the update took more than 5 seconds (the app is working correctly in simulator). I opened the preview diagnostic report folder, and found a file named SerializationErrors.txt, with the following message: Error Domain=NSCocoaErrorDomain Code=516 "“SizeModel+CoreDataClass.swift” couldn’t be linked to “Intermediates” because an item with the same name already exists." I feel like there is a problem of refreshing the class generated for my Core data model. I tried to follow some recommendations found on this website, deleting the Library/Developer/Xcode/UserData/Previews/Simulator Devices/, or also Library/Developer/Xcode/DerivedData, and cleaning/closing Xcode, but none of them had any effect on the problem. Doing so, I noticed that in the Previews folder, two Simulator Devices were generated (one empty "Simulator Devices", and one filled "Simulator%20Devices"), and regenerated even if I clear them. I don't know if it could be related, but I don't know anymore where to search...
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by Ezeta.
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Xcode 13 - make system run out of application memory

After I upgrade to Xcode - 13 I have this problem, every time I try to generate preview in any file, Xcode take more than a minute and the system runs out off application memory: then system become unstable and never recover even closing Xcode, I try restarting but the system hangs and need to make a force shutdown. I reinstalled Xcode more than once and still have the issue. Im running on intel MacBook Pro 2020 BigSur 11.6
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by gmolluso.
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Can't Delete/Uninstall Xcode Previews iPhone App

Not only does the Xcode Previews app not stay in the App Library, showing up on the home screen on startup, but I'm also having trouble finding a way to delete it. Is there a profile somewhere I'm meant to uninstall or some other way to delete the app? Can this only be done through Xcode on the Mac?
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Preview keeps crashing

My Xcode preview keeps crashing and doesn't preview my project. But I have another project that previews perfectly fine. So if anybody knows how to fix this I would gladly appreciate it
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XCODE SwiftUI Preview

I'm trying to preview the SwiftUI screens from my Mac app on the canvas in XCODE 13. In live operation, the model on my app connects to an external device via TCP over the network. I have a an initializer (init()) for my model that initializes the model without network access and I use this in the PreviewProvider in my view file. However, the preview fails to load unless the external device is available on the network. The preview says it is unable to connect to the main application, which makes sense as the main app won't run without the device present. Why does XCODE have to run the app? and if so, what is the purpose of the PreviewProvider in the view file?
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Xcode 13.0 can't control Apple TV device on SwiftUI preview.

Hi there, If I open the preview with an iOS device while developing a screen, I can control it with the mouse and I can do actions such as scrolling and clicking. But if I preview a tvOS device, I can't control it with keyboard, or mouse. Can't we test the tvos devices in preview and try the focus actions? Thanks,
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