# iOS 動態通知 (Live Actiivty) 的挑戰與機會
{%hackmd @mopcon/rkdTi5NTR %}
> 從這開始

## Content

- Live Activity
- Implementation
- Case Study

## Live Activity

### Intro.
- apple 在 iOS16 的新功能
- 會出現在上面
- demo
- IG限時動態
- LinePay
- UberEat
### Device Support
Smart Stack / Locj Screen / Dynamic Islabd
- iOS 16: iPhone
- iOS 17: iPad
- iOS 18: Apple Watch

### Restrictions

- can not access network, location
- at most 5 live activities on a device
- 8+4 hrs, lifetime
- 啟動後8hr內可更新
- 8+4 lifetime
- Payload 4KB
- (unknown,官方文件沒有提供) 更新頻率

> create -> Update -> End
- Local: 都可以
- Remote
- create
- push notification permission needed
- PushToStartToken needed
- IOS 17.2+
- Update
- Push Notification permission needed
- PushToken needed
- End
- Push Notification permission needed
- PushToken needed

### Activity State

- Active -> 直接滑掉 -> Dismissed (Invisible, can not update)
- Ended: Visible, can not update

## UI Presentation

> - 動態島
> - 鎖定螢幕
> - 手錶

### Dynamic Island

3 presentation mode
- Compact Mode
- Minimal
- Expanded
- 長按動態島
- four views: leading, center, bottom, trailing
- iOS 17+ 手機橫放

### Content (Medium)
- alert: 自動展開通知
- Permission Request UI
- 是否authorize該App live activitiy

### Apple Watch

- iOS 18+
- View: Leading, Trailing

### Recap

(table)

## Implementation

### Define Live Activity

- declare `ActivityAttributes`
- needs to be included by both app and its extensions

### Define Live Activity UI

- All presentations (content, dynamic island) should be defined
- 可以給空的view, 建議不要

### Activity Families
- get state -> return different UI
- iOS 18才有支援，如何同時支援iOS 18之前&之後
- provide 2 activity configurations
- Apple Watch?
- 把該部分的抽出來

### Remote Operations
- iOS 17.2+
- push notification permission required
- keey file required
- call APNs API
- 保護好key
- PRIORITY
- 1~10，只適用於自己的app中的優先級
- ACTIVITY_PUSH_TOKEN

:::success
### Remote Start Flow
- get `pushToStartToken`, 涉及到網路連線
- 存到 server
- 組出request
- 推播到裝置, live activity
- local or remote 啟動後 -> upload `pushToken` to server
- If user doesn't clikc the activity
- Solution: ??反正要想辦法拿到
:::

## Case Study

> Line 購物
> get line points
> time limited line points activity -> Line designed a live activity

### Live Activity: time limited

- 商家icon
- store them!
- 放到4KB的那裏面
- push tokens upload fails
- Plan and Design in advance
- Can NOT request new live activity if it reaches the limit
- Checks status when possible Manage it remotely and locally
- 想辦法讓他點進App -> clear some notifications

:::info
## Live Activity
- new entrance to app
- limitations
- variants
:::