# Handle multiple screen shares

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By default, a session allows one screen share at a time. The host can allow several users to share simultaneously, after which each viewer chooses which share to render. For details about this feature, see [Sharing multiple screens simultaneously](https://support.zoom.com/hc/en/article?id=zm_kb&sysparm_article=KB0064237).

## Limitations

-   Multiple people can share their screens at the same time, but only one screen can be rendered at a time.
-   The person currently sharing their screen cannot see another person's screen share stream.

## Host: enable multi-share

To let several participants share at the same time, the host enables simultaneous sharing with `enableMultiShare`. Any user can check the current state with `isMultiShareEnabled`.

```swift
let shareHelper = ZMVideoSDK.shared()?.getShareHelper()

// Host: allow multiple users to share at the same time.
shareHelper?.enableMultiShare(true)

// Anyone: check whether multi-share is currently allowed.
let multiShareEnabled = shareHelper?.isMultiShareEnabled()
```

```objectivec
ZMVideoSDKShareHelper *shareHelper = [[ZMVideoSDK sharedVideoSDK] getShareHelper];

// Host: allow multiple users to share at the same time.
[shareHelper enableMultiShare:YES];

// Anyone: check whether multi-share is currently allowed.
BOOL multiShareEnabled = [shareHelper isMultiShareEnabled];
```

## Host: lock sharing

To prevent other participants from starting a share, the host locks sharing with `lockShare`. While share is locked, only the host can initiate a share. Check `isShareLocked` to drive the UI for non-host users.

```swift
let shareHelper = ZMVideoSDK.shared()?.getShareHelper()

// Host: lock screen sharing for everyone else.
shareHelper?.lockShare(true)

// Anyone: check the current state.
let shareLocked = shareHelper?.isShareLocked()
```

```objectivec
ZMVideoSDKShareHelper *shareHelper = [[ZMVideoSDK sharedVideoSDK] getShareHelper];

// Host: lock screen sharing for everyone else.
[shareHelper lockShare:YES];

// Anyone: check the current state.
BOOL shareLocked = [shareHelper isShareLocked];
```

## Choose which view to display

If the local user would like to subscribe to a specific view instead of the latest view shared from the delegate callback `onUserShareStatusChanged`, identify the user to subscribe to, retrieve the user's share action list, and subscribe to the selected share action.

```swift
let user: ZMVideoSDKUser  // The user whose screen share you want to subscribe to.
let shareActionList = user.getShareActionList()

// The shareActionList can contain 0 to multiple shares coming from the selected user.
if let shareActionList = shareActionList, shareActionList.count > 0 {
    // Get the share you want to subscribe to — for example, the first share.
    let shareAction = shareActionList[0]

    shareAction.getShareCanvas()?.subscribe(with: yourView, aspectMode: .original, resolution: .auto)
}
```

```objectivec
ZMVideoSDKUser* user; // The user whose screen share you want to subscribe to.
NSArray* shareActionList = [user getShareActionList];

// The shareActionList can contain 0 to multiple shares coming from the selected user.
if (shareActionList.count > 0) {
   // Get the share you want to subscribe to — for example, the first share.
   ZMVideoSDKShareAction* shareAction = [shareActionList objectAtIndex:0];

   [[shareAction getShareCanvas] subscribeWithView:yourView aspectMode:ZMVideoSDKVideoAspect_Original resolution:ZMVideoSDKResolution_Auto];
}
```