# WhiteRoomCallbackDelegate Protocol Reference (/zh-CN/api-reference/whiteboard/whiteboard-sdk/ios/protocols/white-room-callback-delegate)

> For AI agents: see the complete documentation index at [llms.txt](/llms.txt).

Whiteboard iOS SDK 2.16.147 公开接口。

@protocol WhiteRoomCallbackDelegate <NSObject>

## 成员 [#成员]

- [firePhaseChanged:](/zh-CN/api-reference/whiteboard/whiteboard-sdk/ios/protocols/white-room-callback-delegate#//api/name/firePhaseChanged:)
- [fireRoomStateChanged:](/zh-CN/api-reference/whiteboard/whiteboard-sdk/ios/protocols/white-room-callback-delegate#//api/name/fireRoomStateChanged:)
- [fireDisconnectWithError:](/zh-CN/api-reference/whiteboard/whiteboard-sdk/ios/protocols/white-room-callback-delegate#//api/name/fireDisconnectWithError:)
- [fireKickedWithReason:](/zh-CN/api-reference/whiteboard/whiteboard-sdk/ios/protocols/white-room-callback-delegate#//api/name/fireKickedWithReason:)
- [fireCatchErrorWhenAppendFrame\:error:](/zh-CN/api-reference/whiteboard/whiteboard-sdk/ios/protocols/white-room-callback-delegate#//api/name/fireCatchErrorWhenAppendFrame:error:)
- [fireCanUndoStepsUpdate:](/zh-CN/api-reference/whiteboard/whiteboard-sdk/ios/protocols/white-room-callback-delegate#//api/name/fireCanUndoStepsUpdate:)
- [fireCanRedoStepsUpdate:](/zh-CN/api-reference/whiteboard/whiteboard-sdk/ios/protocols/white-room-callback-delegate#//api/name/fireCanRedoStepsUpdate:)
- [fireMagixEvent:](/zh-CN/api-reference/whiteboard/whiteboard-sdk/ios/protocols/white-room-callback-delegate#//api/name/fireMagixEvent:)
- [fireHighFrequencyEvent:](/zh-CN/api-reference/whiteboard/whiteboard-sdk/ios/protocols/white-room-callback-delegate#//api/name/fireHighFrequencyEvent:)
- [onUnifiedPageStateChange:](/zh-CN/api-reference/whiteboard/whiteboard-sdk/ios/protocols/white-room-callback-delegate#//api/name/onUnifiedPageStateChange:)

<a id="//api/name/firePhaseChanged:"></a>


<a id="tasks"></a>

### `– firePhaseChanged:` [#-firephasechanged]

<ApiSignature>

\- (void)firePhaseChanged:(WhiteRoomPhase)phase;

</ApiSignature>

```text
房间连接状态发生变化回调。
 @param phase 房间的连接状态，详见 [WhiteRoomPhase](/zh-CN/api-reference/whiteboard/whiteboard-sdk/ios/constants/white-room-phase)。
```

Declared in Room/WhiteRoomCallbacks.h

<a id="//api/name/fireRoomStateChanged:"></a>

### `– fireRoomStateChanged:` [#-fireroomstatechanged]

<ApiSignature>

\- (void)fireRoomStateChanged:(WhiteRoomState *)modifyState;

</ApiSignature>

```text
房间状态属性发生变化回调。

 该回调仅返回发生变化的房间状态属性，未发生变化的房间状态字段，均为空。

 @param modifyState 发生变化的房间状态属性，详见 [WhiteRoomState](/zh-CN/api-reference/whiteboard/whiteboard-sdk/ios/classes/white-room-state)。
```

Declared in Room/WhiteRoomCallbacks.h

<a id="//api/name/fireDisconnectWithError:"></a>

### `– fireDisconnectWithError:` [#-firedisconnectwitherror]

<ApiSignature>

\- (void)fireDisconnectWithError:(NSString *)error;

</ApiSignature>

```text
白板 SDK 与白板服务器连接中断回调。

 @param error 错误信息。
```

Declared in Room/WhiteRoomCallbacks.h

<a id="//api/name/fireKickedWithReason:"></a>

### `– fireKickedWithReason:` [#-firekickedwithreason]

<ApiSignature>

\- (void)fireKickedWithReason:(NSString *)reason;

</ApiSignature>

```text
用户被服务器移出房间回调。

 @param reason 用户被移除房间的原因。
```

Declared in Room/WhiteRoomCallbacks.h

<a id="//api/name/fireCatchErrorWhenAppendFrame:error:"></a>

### `– fireCatchErrorWhenAppendFrame:error:` [#-firecatcherrorwhenappendframeerror]

<ApiSignature>

\- (void)fireCatchErrorWhenAppendFrame:(NSUInteger)userId error:(NSString *)error;

</ApiSignature>

```text
同步用户行为发生错误回调。

*Note:** 该回调通常是可以忽略的，你可以根据业务情况自行决定是否监听。

 @param userId 用户 ID。
 @param error 错误原因。
```

Declared in Room/WhiteRoomCallbacks.h

<a id="//api/name/fireCanUndoStepsUpdate:"></a>

### `– fireCanUndoStepsUpdate:` [#-firecanundostepsupdate]

<ApiSignature>

\- (void)fireCanUndoStepsUpdate:(NSInteger)canUndoSteps;

</ApiSignature>

```text
可撤销次数发生变化回调。

 当本地用户调用 [undo](/zh-CN/api-reference/whiteboard/whiteboard-sdk/ios/classes/white-room#//api/name/undo) 撤销上一步操作时，会触发该回调，报告剩余的可撤销次数。

 @param canUndoSteps 剩余的可撤销次数。
```

Declared in Room/WhiteRoomCallbacks.h

<a id="//api/name/fireCanRedoStepsUpdate:"></a>

### `– fireCanRedoStepsUpdate:` [#-firecanredostepsupdate]

<ApiSignature>

\- (void)fireCanRedoStepsUpdate:(NSInteger)canRedoSteps;

</ApiSignature>

```text
可重做次数发生变化回调。

 当本地用户调用 [redo](/zh-CN/api-reference/whiteboard/whiteboard-sdk/ios/classes/white-room#//api/name/redo) 重做上一步操作时，会触发该回调，报告剩余的可重做次数。

 @param canRedoSteps 剩余的可重做次数。
```

Declared in Room/WhiteRoomCallbacks.h

<a id="//api/name/fireMagixEvent:"></a>

### `– fireMagixEvent:` [#-firemagixevent]

<ApiSignature>

\- (void)fireMagixEvent:(WhiteEvent *)event;

</ApiSignature>

```text
白板自定义事件回调。

 @param event 自定义事件。详见 [WhiteEvent](/zh-CN/api-reference/whiteboard/whiteboard-sdk/ios/classes/white-event)。
```

Declared in Room/WhiteRoomCallbacks.h

<a id="//api/name/fireHighFrequencyEvent:"></a>

### `– fireHighFrequencyEvent:` [#-firehighfrequencyevent]

<ApiSignature>

\- (void)fireHighFrequencyEvent:(NSArray&lt;WhiteEvent *&gt;*)events;

</ApiSignature>

```text
高频自定义事件一次性回调。

 @param events 高频自定义事件。详见 [WhiteEvent](/zh-CN/api-reference/whiteboard/whiteboard-sdk/ios/classes/white-event)。
```

Declared in Room/WhiteRoomCallbacks.h

<a id="//api/name/onUnifiedPageStateChange:"></a>

### `– onUnifiedPageStateChange:` [#-onunifiedpagestatechange]

<ApiSignature>

\- (void)onUnifiedPageStateChange:(WhiteUnifiedPageStateChange *)state;

</ApiSignature>

```text
MainView、DocsViewer、Slide 或 Presentation 的统一页面/缩放状态变化。
```

Declared in Room/WhiteRoomCallbacks.h