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A Summary of the WWDC25 Group Lab

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Reply to Foundation Models performance reality check - anyone else finding it slow?
You can probably start with profiling your app with Instruments.app, as discussed in the WWDC25 code along session (starting at 24:32). How to set up the Foundation Models instrument is detailed here. The Foundation Models instrument provides the token numbers the models generate. From there, you can calculate how many tokens per second. The number can vary a lot, but if it is consistently much worse than 20~30/s, I'd suggest that you file a feedback report and share your report ID here. The WWDC25 session also discusses how to use prewarm and includesSchemaInInstructions to improve performance in cases that are appropriate. You can check if that can be applied to your app. Best, —— Ziqiao Chen  Worldwide Developer Relations.
Jul ’25
Switching subscription groups
I have an app where fans can subscribe to multiple content creators and this is implemented using a sub group for each creator. I want to add a new all access subscription that gets them access to everything. We are treating this as an upgrade from the individual sub. Is there a way to cancel (or swap) the individual sub when they subscribe to the bundled sub? I know within a sub group it is possible to go between sub levels, but not sure about across sub groups.
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Apr ’24
Reply to Does AU Lab support AU v3?
AU Lab does not currently open audio unit extensions. I suggest filing a bug if having audio unit extension support in AU Lab is important to you. What makes the conversation interesting is then deciding how to provide a comparable iOS solution.
Topic: Media Technologies SubTopic: Audio Tags:
Oct ’16
Notes from Security lab (Wednesday, June 9th 2021)
Question: As of macOS Big Sur, it is not required for an installer package to be signed or notarized in order for it to be installed via Installer.app or the installer command line tool. Is this still the case on macOS Monterey? If it is not, what requirements have changed? Answer: Restrictions are the same as on macOS Big Sur for installer packages with regards to notarization. Question: Is there any additional guidance from Apple on the installation and use of multiple solutions using System Extensions and/or Network Extensions when it comes to co-habitation? For example, is it supported by Apple to have two Network Filters (each managed by a separate application) installed and active? Answer: Having multiple network system extensions installed is supported by Apple. Multiple content filters are supported on iOS and macOS: iOS: 2 filters maximum macOS: 8 filters maximum Question: As of macOS Big Sur, it is not required for an application to be signed or notarized in order for it to be installed or run on an
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Jun ’21
Group Notifications
HiIm surprised that were now on iOS 12 Beta 6 that Group Notifications still doesn't work properly :-( I don't mean 3rd part Apps, I mean Apple Stock Apps like Mail and Messages. Sometimes it can be hit or miss, it will work one day and not another.Anyone else noticing the same?
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Aug ’18
AppGroups - com.apple.security.application-groups
Hello, Could you please explain to me what the difference between using app groups with a secure key (com.apple.security.application-groups) inside entitlements is? I haven't found any relevant source on the internet. Does it have any connection with the team? It the access to App Groups with this key restricted only for a specific developer team or app bundle id? Thank you for your time :)
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Sep ’20
how to show picture in summary page of macOS installer
Hi, I added one QR Code in conclusion.html in macOS installer, after the installation complete, the summary page cannot show the picture. I have tried with base64 embeded picture, local picture and load picture from internet, all are not useful. Please let me know how to show the picture in summary page of macOS installer. I used productbuild to build my macOS application. Below is the Distribution.xml language ?xml version=1.0 encoding=utf-8 standalone=no? installer-script minSpecVersion=1.000000 title__PRODUCT__/title background mime-type=image/png file=banner.png scaling=proportional/ welcome file=welcome.html mime-type=text/html / conclusion file=conclusion.html mime-type=text/html / license file=LICENSE.txt/ options customize=never allow-external-scripts=no/ domains enable_localSystem=true / installation-check script=installCheck();/ script function installCheck() { if(!(system.compareVersions(system.version.ProductVersion, '10.6.0') = 0)) { my.result.title = 'Unable to install'; my.res
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Mar ’21
How to Group UI aspects?
I'm new to programming on XCode and I'm currently messing with the UI trying to setup the program similar to a worksheet I have in real life. The worksheet has several boxes around the paper that are grouped so that statistics can be recorded and found easily. I would love to have my program look more like this, with grouped sets of statistics, but I've no idea how to do it. I would like to have a slighly shaded box that would have input fields in it. I hope that makes sense.My main concern is that currently Stack View really messes up my formatting but does in some way actually group toegther the 24 text fields I have. I'd also like it if this grouping allowed me to resize everything inside of it at the same time.I know its truly a noob situation but I've only been playing with this for 2 days.
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Apr ’17
10.13.4 - Supressing 32-bit notices on lab machines?
Has anyone found a preference/MDM payload for suppressing the 32-bit app nags in 10.13.4? On lab machines which have profiles regularly wiped, this effectively means every user sees these at every login. There's nothing end users (or we) can do about various apps until vendors update them -- all this does is scare users and generate unecessary support calls.<rant> Introducing behavior like this in a patch (as opposed to a major version upgrade) is also very uncool. We have not started deploying 10.13 yet and continuing surprises like this (and user approved enrollment in 10.13.2) in a minor point release have us considering skipping 10.13 altogether (even if it means holding up new hardware purhases)... </rant>
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Jan ’18
ManagedSettingStore limits and groups
So what's the point of being able to block unto 50 apps per ManagedSettingStore via store.application.blockedApplications (which works fine) until removing the blocked apps or clearing the store. Where the following occurs if you have a social networking group with more than 9 apps only 9 apps will go back into the group and all the others will go onto the springboard all jumbled if you end up with an empty group then tap into the group, it is removed then during the reset all apps are placed back on to the springboard
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Jan ’25
Reply to RealityKit Mesh with USDZ 3D Model
@lijiaxu Adding to what Greg said, I recommend reviewing the section Prepare assets for gameplay for our WWDC25 sample Petite Asteroids. This article describes the process of loading complex geometry and using it to generate a collision mesh. Thank you for your question!
Topic: Spatial Computing SubTopic: General Tags:
Jul ’25
Developer tools group
Hi,Every time I restart my computer and reopen Xcode, a message shows up wich tells to enter the credencials of a member of the Developer tools group in order to enable the Debugging features.My question is where I can add users to this group, so that not-admin-users also can enable it.Thank you in advance,logic3
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Apr ’16
Favorite Athlete Lab - Cell reuse identifier not found in scope
I'm working on the Favorite Athlete Lab - trying to complete it while accepting I don't understand everything it is teaching yet. I've encountered many challenges with the Lab but the current on is: I've set the cell reuse identifier of my cell to 'drinkCell' in the attributes inspector - but when I use it in the scenes ViewController, I get the error can not find 'drinkCell' in scope. I can see from the teacher resources how this has been solved there, but as far as I can tell, this solution has not be taught at any point so far, and isn't even mention in the subsequent section on cell dequeuing. let cell = tableView.dequeueReusableCell(withIdentifier: drinkCell, for: indexPath) Any help understanding this much appreciated.
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Jan ’23