Does 都成麻将 work on iPhone Duo?
It works, but with black bars. 都成麻将 1.0.4 is built with the iOS 16.4 SDK, so iPhone Duo runs it in a phone-sized window on the inner display.
At a glance
- Inner display (7.6″)
- Black bars
- Outer display (5.4″)
- Works normally
- Built with
- iOS 16.4 SDK
- Version 1.0.4, read Nov 4, 2026
- iPad version
- Yes
- Layout already handles big screens
- Latest version
- v1.0.4
- Oct 25, 2023
- Duo in release notes
- Not yet
About 都成麻将
都成麻将 is made by Chengdu Licheng Xiangfei Network Technology Co., Ltd and first came out on the App Store in July 2023. It's only on the China App Store, where it has 18 ratings. Version 1.0.4 came out on Oct 25, 2023 and needs iOS 11.0 or later. It's free to download.
From its App Store listing:
正宗的广西麻将玩法，清晰地画面，畅爽游戏。包含广西地区主流的防城港麻将，北海麻将，红中麻将等玩法。独特的锄大地玩法，给您带来不一样的全新体验。 都成麻将以简单易懂的操作方式和精美的界面设计为特点，满足年轻用户群体的同时也充分考虑到了中老年用户的操作习惯，提示清晰，支持点击出牌和拖动出牌，在这里玩家可以通过不断的练习，提升自己的技能水平，挑战更高的场次和更强的对手。 高手在线，极速匹配 众多高手在线，极速匹配，对局无需等待 呼朋引伴，好友对战 创建房间，邀请好友，天南地北，随时约局 都成麻将是一款充满地方特色和乐趣的游戏，无论是对于广西本地的玩家还是其他地区的麻将爱好者都是一款值的尝试的游戏，立即下载，开启休闲之旅吧！
On the inner display
Apps built with older SDKs are placed in a phone-sized safe area on a black background. Everything works; you just don't get the bigger screen.
In Split View
iPhone Duo is the first iPhone that can show two apps side by side, and every app takes part — including 都成麻将. Open it on the inner display, then add a second app next to it. You can save the pair and come back to it later.
Duo-specific features
None confirmed yet. Duo-specific features include side toolbars, layouts that react to the fold, and content on the outer display while the app is open inside.
Evidence & history
App build,
Version 1.0.4 is built with the iOS 16.4 SDK
Apple runs apps built with the iOS 26 SDK or earlier in a phone-sized window on the inner display.
- : Not confirmed yet → Black bars — built with the iOS 16.4 SDK
Latest release notes
Version 1.0.4 · Oct 25, 2023
更新内容： 优化玩法。
Questions
Does 都成麻将 work on iPhone Duo?
It works, but with black bars. 都成麻将 1.0.4 is built with the iOS 16.4 SDK, so iPhone Duo runs it in a phone-sized window on the inner display.
Does 都成麻将 work on the outer display?
Yes. iPhone Duo's 5.4-inch outer display behaves like a regular iPhone screen, so every iPhone app works there as usual.
Can I use 都成麻将 in Split View on iPhone Duo?
Yes. On iPhone Duo every app can be placed side by side with another app on the inner display — developers don't need to opt in. How comfortable it feels at half width depends on the app's layout.
Why does 都成麻将 have black bars on iPhone Duo?
Apps built with the iOS 26 SDK or earlier run in a phone-sized window on the inner display, and iOS 27 builds can still leave some space empty. The bars disappear once the developer rebuilds the app with the iOS 27.1 SDK — you only need to update the app.
When will 都成麻将 fill iPhone Duo's inner display?
When its developer releases an update built with the iOS 27.1 SDK or later. We read the SDK of every new version of 都成麻将 within about a day of its release and update this page.
What can I do about the black bars until then?
Use 都成麻将 on the outer display, where it works like on any iPhone, or put it in Split View next to another app on the inner display so less of the screen goes unused.