If you exceed the monthly quota in your WeatherKit plan what happens when you make an API call (Swift SDK), does it just error out? Will Apple give you some grace period to upgrade your quota to a larger value before stopping you from being able to make queries?

After updating our app some of our users are seeing that their widget has gone blank, the whole widget it just white. The only way to make the widget render again is to reboot the phone. This seems to be happening randomly and mainly on iOS17. Looking on the web, seems like other people are also having this issue so hopefully Apple will make a fix at some point but I'm wondering if other people have had this issue and figured out a workaround to stop it happening? Thanks.

I'm not sure which combination of iOS/XCode/Mac OS is causing this issue, but all of a sudden when I try to run our SceneKit app and the "Scheme -> Diagnostics -> Metal -> API Validation" setting is turned off the scene won't render and the console is just full of the following errors: Execution of the command buffer was aborted due to an error during execution. Invalid Resource (00000009:kIOGPUCommandBufferCallbackErrorInvalidResource) [SceneKit] Error: Main command buffer execution failed with status 5, error: Error Domain=MTLCommandBufferErrorDomain Code=9 "Invalid Resource (00000009:kIOGPUCommandBufferCallbackErrorInvalidResource)"  ) If you run the app outside of xcode it's fine, also enabling the "API Validation" option stops the issue. One of my schemes has this option disabled since the project began and never had an issue before. Just throwing this out there incase someone else has spent hours of their life trying to figure out why this is not working for them. Also you can just create a new SceneKit project and turn that diagnostic option off and the app won't render anything.

The documentation lists the number of calls per month you can make for the different pricing tiers here: https://developer.apple.com/weatherkit/get-started/ but are there going to be any per second/minute/hour rate limits on calls to the API like with other weather service APIs. For example maybe you get 1,000,000 calls per month but there is some limit like 5 calls per second or 10,000 calls per hour imposed by the APIs? Also what happens if you go over your allowed call limit for the month, will the API just return an error like HTTP 402 or you will get a warning for a period of time? Would you be able to buy extra calls for the month without having to upgrade to a new tier, assuming maybe you are experiencing a temporary increase in traffic.

When I run my widget from xcode I see getTimeline is called twice for some reason. It's called the first time, then after it returns a timeline it's called again. The logs have the following message: "-[EXSwiftUI_Subsystem beginUsing:withBundle:] unexpectedly called multiple times." It takes about 0.5 seconds for the first getTimeline call to return so it doesn't seem like the OS should try to call this method again so quickly (my timeline entries all have times in the future so they shouldn't request the widget to load immediately) Is this a bug, or expected? Seems to happen every time I run the widget.

Hi - I don't see anything in the documentation about which regions of the world the API will support e.g. US, Europe. I see there is an /api/v1/availability you can call but is there some rough guidelines around what areas are supported and which aren't. Thanks Mark.

If you use the iOS16 Swift WeatherKit API you can get the weather data attribution logo doing something like: // Skipping full syntax for example let attribution = WeatherService.shared.attribution // A URL to an image you can show along with the weather data attribution.combinedMarkLightURL What about if you are not using the iOS16 WeatherKit wrappers e.g. you are using the REST API on your own server to return data. The API docs show a providerLogo/providerName parameter in the metadata returned from the service, but they don't seem to be populated right now. Is it ok just to use a unicode Apple logo to make a string instead like:  Weather Also in the API there is a metadata object returned in each dataset e.g. current, daily, hourly which each has an attributionURL field, will all those values always be the same or we might have to display multiple URLs for data sources, the Swift example seems to just have one attribution object.

Is it possible to retrieve the sleep schedule wakeup and bedtime times using HealthKit? I can retrieve sleep analysis values, but I don't want the detailed data just the wake up and bedtime times the user has possibly specified in the health app, I can't see any way to retrieve those values. Thanks.

I'm trying to update my projects to use Swift6, if I change the project settings to use Swift6 then my app crashes when I add a closure to the SCNAnimation animationDidStop property. The error is inside the SceneKit renderingQueue and indicates that the callback is being called on the wring queue. Maybe I need to do something in the code to fix this but I can't seem to make it work, maybe a SceneKit bug? If you create a new game template in Xcode using SceneKit and replace the contents of GameViewController.swift with the following you will see the app crash after it is launched. import UIKit import SceneKit class GameViewController: UIViewController { let player: SCNAnimationPlayer = { let a = CABasicAnimation(keyPath: "opacity") return SCNAnimationPlayer(animation: SCNAnimation(caAnimation: a)) }() override func viewDidLoad() { super.viewDidLoad() let scnView = self.view as! SCNView scnView.scene = SCNScene() // Change the project settings to use Swift6 // Setting this closure will then cause a _dispatch_assert_queue_fail // EXC_BREAKPOINT error in the scenekit.renderingQueue.SCNView queue, // the only thing on the stack is: // "%sBlock was %sexpected to execute on queue [%s (%p)]" player.animation.animationDidStop = { (a: SCNAnimation, b: SCNAnimatable, c: Bool) in print("stopped") } scnView.scene?.rootNode.addAnimationPlayer(player, forKey: nil) player.play() } }

In this WWDC talk about liquid glass https://developer.apple.com/videos/play/wwdc2025/219/ they mention that there are two variants of liquid glass, regular and clear. I don't see any way to try the clear variant using the .glassEffect() APIs, they only expose regular, is there some other way to try the clear variant?

I'm trying to render a large number of entities, it looks like each ModelEntity causes a draw call, even if you share the ModelComponent so each Entity shares the mesh and materials. I tried to use the MeshInstanceCollection inside MeshResource to generate a large number of objects in the scene, the code works and draws many objects but the draw count is still one call per instance, this seems strange I would assume it should only be one draw call for the single entity since I have specified to use instancing in the resource. Has anybody else successfully used instancing in RealityKit to draw a large number go Entities (maybe around 10,000) or drawn this amount of items successfully with 60fps any other way? Here is some sample code that draws 100 cubes using instancing but still causes 100 draw calls. func instanceTest(scene: RealityKit.Scene) { var resource = MeshResource.generateBox(size: 0.2) var contents = MeshResource.Contents() contents.models = resource.contents.models var arr: [MeshResource.Instance] = [] var matrix = matrix_identity_float4x4 matrix[3, 0] = 0.5 for i in 0..<100 { let inst = MeshResource.Instance(id: "\(i)", model: "MeshModel", at: matrix) arr.append(inst) } contents.instances = MeshInstanceCollection(arr) let updatedResource = try? MeshResource.generate(from: contents) let unlitMaterial = UnlitMaterial(color: .red) let modelEntity = ModelEntity( mesh: updatedResource!, materials: [unlitMaterial] ) let anchor = AnchorEntity() anchor.addChild(modelEntity) scene.addAnchor(anchor) }

In the iOS Photos app there is a caption field the user can write to. How can you write to this value from Swift when creating a photo? I see apps that do this, but there doesn't seem to be any official way to do this using the Photo library through PHAssetCreationRequest or PHAssetResourceCreationOptions or setting EXIF values, I tried settings a bunch of values there including IPTC values but nothing appears in the caption field in the iOS photos app. There must be some way to do it since I see other apps setting that value somehow after capturing a photo.

How do you change the monthly plan? I don't see anywhere in the developer accounts pages to do it or in app store connect. The only things I see in developer accounts is a services list with a weatherkit item, but it just shows usage numbers, no option to upgrade to a different plan.

Do you have to compile your apps with Swift6 enabled to ship a production app when iOS18 is released?

In SwiftUI sliders now have tick marks by default on iOS26, how do you turn them off or hide them? This WWDC talk had some sample code on how to set the tick marks but it doesn't compile for me: https://developer.apple.com/videos/play/wwdc2025/323/ I don't see any available methods or initializers to turn them off.