iOS: Permissions.RequestAsync is getting main thread warnings #29172
Description
From @mmiller-d8 on Mon, 21 Apr 2025 20:13:00 GMT
Type: Bug
This is on iOS.
When calling Permissions.RequestAsync<Premissions.LocationWhenInUse> it prints out three instances of a warning saying that performance may be impacted when running on the main thread. Of course, you must call RequestAsync on the main thread because it can show a dialog. If you don't, an exception is thrown.
I have not tried to look at the source, but it looks like that method is doing other stuff that shouldn't be done on the UI thread. I might also assume that it is just running on whatever thread it's called from, especially since it doesn't work if you don't explicitly call it on the main thread.
My Maui extension is out of date because, well, I don't have a full day to update it. Every time I end up having to upgrade other things.
Here's the code I'm calling:
Debug.WriteLine($"Is MainThread: {MainThread.IsMainThread}");
PermissionStatus status = await Permissions.CheckStatusAsync<Permissions.LocationWhenInUse>();
await MainThread.InvokeOnMainThreadAsync(async () => {
Debug.WriteLine("Requesting access");
if (status != PermissionStatus.Granted)
status = await Permissions.RequestAsync<Permissions.LocationWhenInUse>();
Debug.WriteLine("Requested access");
});
And here is the debug output:
Is MainThread: False
Checking status
Requesting access
2025-04-21 15:18:19.987018-0500 D8.Mobile[61036:115145116] [CoreLocation] __delegate_identifier__:Performance Diagnostics__:::____message__: This method can cause UI unresponsiveness if invoked on the main thread. Instead, consider waiting for the `-locationManagerDidChangeAuthorization:` callback and checking `authorizationStatus` first.
2025-04-21 15:18:19.988760-0500 D8.Mobile[61036:115145116] [CoreLocation] __delegate_identifier__:Performance Diagnostics__:::____message__: This method can cause UI unresponsiveness if invoked on the main thread. Instead, consider waiting for the `-locationManagerDidChangeAuthorization:` callback and checking `authorizationStatus` first.
2025-04-21 15:18:19.992727-0500 D8.Mobile[61036:115145116] [CoreLocation] __delegate_identifier__:Performance Diagnostics__:::____message__: This method can cause UI unresponsiveness if invoked on the main thread. Instead, consider waiting for the `-locationManagerDidChangeAuthorization:` callback and checking `authorizationStatus` first.
Requested access
Extension version: 1.8.9
VS Code version: Code 1.99.2 (4949701c880d4bdb949e3c0e6b400288da7f474b, 2025-04-10T01:21:25.295Z)
OS version: Darwin arm64 24.3.0
Modes:
System Info
| Item | Value |
|---|---|
| CPUs | Apple M3 Max (14 x 2400) |
| GPU Status | 2d_canvas: enabled canvas_oop_rasterization: enabled_on direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: disabled_off video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off |
| Load (avg) | 5, 5, 5 |
| Memory (System) | 96.00GB (0.43GB free) |
| Process Argv | --crash-reporter-id 1618046c-b005-4c1a-89ae-cb627902572c |
| Screen Reader | no |
| VM | 0% |
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Copied from original issue microsoft/vscode-dotnettools#1950