The run loop passes touch events to the UIApplication object, which converts them into UIEvents and dispatches them via sendEvent(_:) to the relevant UIWindow for the active scene. The window, in turn, dispatches the event to a UIView, determining the target via hit testing. The UIWindow forwards the UIEvent to the target view, firing the touchesBegan(_:with:) method, or other appropriate UIResponder method. Now that we’re no longer mucking about inside subterranean system internals, we might as well demonstrate with a nice visual example to make the most of the light of day. Let’s create a custom skeuomorphic 3D button by subclassing UIView, complete with the aforementioned UIResponder methods:  When a user touches down, it presses in. Just like a real button should. No liquid glass nonsense here. The full pipeline just ran before your eyes. Back up. To understand what happens after your tap event is registered, we should clarify that UIViews in UIKit are ultimately backed by Core Animation CALayers. Read Touch to Pixels: UI Pipeline Internals on iOS right here ⚙️ blog.jacobstechtavern.com/p/…

The UI pipeline is a complex beast, orchestrating across several lightly-documented systems. It’s tough to find a throughline that can explain it all. Today we’re tracking the journey of a touch event: from sensors, to your code, and back up to pixels, through every system along the way: - Your finger taps the capacitive touch sensor. - The kernel creates a touch event via hardware drivers. - backboardd handles the event and forwards it to your app process. - Your app’s run loop passes a UIEvent to the relevant view. - Your code performs a CATransaction to update its layer tree. - The UIWindow’s CAContext bridges to the render server via IPC. - The render server rasterises and composites layers across each process. - It then issues drawing commands to the GPU for compositing and animation. - A frame buffer of pixels is generated and sent to the display hardware. Read Touch to Pixels: UI Pipeline Internals on iOS right here ⚙️ blog.jacobstechtavern.com/p/…

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モバチキ 〜Mobile Tips 共有会〜 #5 Modeling UiEvent 本日の発表資料です speakerdeck.com/mikanichinos… #mobatiki

UiEventについてお話しようと思います karabiner.connpass.com/event… #mobatiki

I wonder how many times touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) has been called since then…

🤮 Just get rid of all lamdas and use a common lamda dispatchEvent(event: UIEvent) with different events.

Avspänning nyckeln till att kunna upprätta relation mellan Sverige och Nordkorea konstaterar UI:s forskare på #uievent.

Not an a11y person per se but all my works gets professionally tested for accessibility. I would actually argue 'button.' It's an HTMLElement and there is a UIEvent on it that makes something happen. Also has a 'pressed' state.

``` val eventsChannel = Channel<UiEvent>(BUFFERED) lateinit var events : Flow<UiEvent> val job = launch { events = eventsChannel.consumeAsFlow().shareIn(this, SharingStarted.Lazily) } ``` sigh