Mob 0.9.26 released!

Mob 0.9.26 has been released.

Added

• Mob.Keyboard.dismiss/1 — take the on-screen keyboard down from the
  BEAM. A screen had no way to dismiss the keyboard from its own handler —
  a Save button, a tap on blank space, a committed value — short of removing
  the field from the tree. The built-in exits are the return key (which the
  decimal and number keyboards don’t have, so on_submit never fires for
  them), another field taking focus, and the iOS keyboard-toolbar “Done”.
  New dismiss_keyboard/0 NIF. iOS resigns the first responder in any
  visible window and returns once the main thread has done it (IO_BOUND,
  2 s bound), so a value: assigned in the same handler reaches the field.
  Android calls MobBridge.dismissKeyboard() from the matching mob_new
  template (GenericJam/mob_new#113), which hides the soft keyboard and clears
  focus in the focused field’s own window, a sheet’s included. On a bridge
  without it the NIF returns {:error, :not_loaded} and dismiss/1 is a
  no-op.
  dismiss/1 returns the socket and is a no-op on the host. Guide:
  guides/device_capabilities.md → Keyboard. Decision:
  decisions/2026-09-24-keyboard-dismiss-is-a-device-api.md.

Changed

• Zig pin is 0.17.0. Replaces 0.17.0-dev.269+ebff43698. That nightly
  existed because 0.15.x could not link on the macOS 26 SDK; 0.17.0 is the
  stable that has the fix (build_system_migration.md). mix mob.doctor
  still requires an exact zig version match. Companion to mob_dev and
  mob_new, which move with it.

Fixed

• Android Zig sources compile on Zig 0.17.0, and still on the old
  nightly. std.fmt.bufPrintZ was removed in 0.17.0, and its replacement
  std.mem.printSentinel is missing in 0.17.0-dev.269, so the post-mortem
  marker paths in mob_nif.zig format through a local printZ on
  std.fmt.bufPrint, which both have. An app that updates mob but keeps
  mob_dev 0.7.30 (which pins the nightly) still builds for Android.
  Allocator.dupeZ was removed, so mob_stored_queue.zig’s tests use
  dupeSentinel. CI now sets up the pinned Zig from .tool-versions,
  compiles mob_nif.zig for Android and runs every Android Zig test file.
• iOS sheets take their identity from :id (115). A sheet’s
  presentation state was tied to its place in the tree, and a container’s
  child keying (MOB-127) does not reach every sheet, such as one that is the
  screen’s root. There, after the user swiped a sheet down, a sheet with a
  different :id in its place never presented, and replacing an open sheet
  kept the old presentation and lost the new sheet’s on_dismiss. An :id
  is now the sheet’s identity on iOS as on Android (mob_new #43); without
  one, identity stays positional. The replaced sheet’s late on_dismiss is
  dropped. A replacement for an open sheet also presents at its own detents:
  under a keyed container it came up full height with no drag indicator.
• A task killed from outside right after start_async/3 reports the real
  reason (MOB-500). Mob.Screen.Server could pass {:exit, :noproc} to
  handle_async/3 when the kill landed before the screen’s monitor reached
  the task’s runner, since Process.monitor/1 is asynchronous. The screen
  traps exits, so it now takes the reason from the runner’s link (:killed
  for Process.exit(pid, :kill)). Seen once in a few thousand runs of
  async_test.exs, next to a test-side race on the same signal ordering.
• Android on_blur survives a re-render in the handler that took focus
  away. The blur was resolved generation-strictly, but focus is lost on
  the UI thread after the BEAM has already committed the handler’s new tap
  table, so it carried a stale handle and was dropped: 6 of 8 blurs after
  Mob.Keyboard.dismiss/1 plus an assign, on a Moto G Power 2021. It now
  resolves by identity (same slot, pid and tag), as change events and the
  iOS final-text blur already do.

Upgrading

• Zig 0.17.0, with mob_dev and mob_new’s matching releases. In each
  app, set zig 0.17.0 in .tool-versions (mise use zig@0.17.0 installs
  it and edits the file; mise install zig@0.17.0 alone leaves the app on
  the nightly). iOS apps also need ios/build.zig and
  ios/build_device.zig off b.build_root, which 0.17.0 removed: in the
  Swift glob, replace b.build_root.handle.openDir( with
  std.Io.Dir.openDirAbsolute(, and add b.dependOnDirectoryContents(.{ .cwd_relative = b.fmt("{s}/ios", .{mob_dir}) }); before it (0.17.0
  caches the configure phase, so without it a new mob Swift file is missed).
  Or copy the block from a freshly generated app. mix mob.doctor flags
  both.
• Android: Mob.Keyboard.dismiss/1 needs MobBridge.dismissKeyboard().
  New apps from the matching mob_new have it. In an existing app, copy
  dismissKeyboard(), focusedFieldHost, the InputMethodManager and
  LocalView imports, and the hostView and focusedFieldHost lines in MobTextField
  from a freshly generated MobBridge.kt. Without the method the call leaves
  the keyboard up.

Mob Info

Classification: Hybrid Mobile Framework
Description: BEAM-on-device mobile framework for Elixir. OTP runs inside your iOS and Android apps — embedded directly in the app bundle, no server required. Screens are GenServers; the UI is rendered by Compose and SwiftUI via a thin NIF.
Forum/tag: mob

Click here to view Mob’s main announcement thread.