Not able to preview on iPhone device

Question

pramestihattak OP

Created Dec ’23

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Hi,

I just learn swiftUI and trying to preview it on my device (iPhone 15 Pro Max), however the app is failed to launch on my device. I haven't change anything on the code yet.

Here's the error message from diagnostic

== PREVIEW UPDATE ERROR:

    FailedToLaunchAppError: Failed to launch swplayground.MQ
    
    ==================================
    
    |  MessageError: Connection interrupted
    |  
    |  ==================================
    |  
    |  |  MessageSendFailure: Message send failure for <ServiceMessage 28: relaunch>

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Answer 1

Developer Tools Engineer OP

Apple

Dec ’23

Hi,

Sorry to hear you are having problems getting previews working. This error can often indicate a crash in your application when it launches, or a problem with the simulator. If you look into the folder ~/Library/Logs/DiagnosticReports, do you see any crash reports for your app?

If not, the best next step will be to file a feedback with diagnostics so we can take a look.

Steps to generate helpful diagnostics:

Download and install the logging profile on all devices involved. Instructions and profiles are available here: https://developer.apple.com/bug-reporting/profiles-and-logs/?name=swift
Reproduce the issue
Click the "Diagnostics" button in the error banner in Previews' Canvas area (or if the banner is missing you can use the menu: Editor > Canvas > Diagnostics)
In the sheet that appears, click "Generate Report" in the bottom left of the sheet
Attach (or make from the folder) the resulting zip file to the bug (will be named something like previews-diagnostics-0123456789.zip)
Generate the sysdiagnose(s) and attach those too

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