> For the complete documentation index, see [llms.txt](https://docs.apryse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.apryse.com/ios/annotation/tool-manager-events.md).

# Get notified of events fired from ToolManager on iOS

Discover how the ToolManagerDelegate in ToolManager can enhance your app's functionality with delegate methods for event notifications and tool behavior modifications. Learn more about these essential

The [`ToolManager`](https://sdk.apryse.com/api/ios/Classes/PTToolManager.html)['s](https://sdk.apryse.com/api/ios/Classes/PTToolManager.html)[`ToolManagerDelegate`](https://sdk.apryse.com/api/ios/Protocols/PTToolManagerDelegate.html) exposes a number of delegate methods to allow a subscriber to be notified of events that are managed by the tools framework. There are [a number of methods](/ios/annotation/customization.md) that allow you to modify the behaviour of the tools themselves. The methods discussed here are simple notifications, so that the app may coordinate as necessary.

1. [`-toolManagerToolChanged:`](https://sdk.apryse.com/api/ios/Protocols/PTToolManagerDelegate.html#/c:objc\(pl\)PTToolManagerDelegate\(im\)toolManagerToolChanged:) This method is called when the tool changes, for example changing the "active" tool in a toolbar.
2. [`-toolManager:annotationAdded:onPageNumber:`](https://sdk.apryse.com/api/ios/Protocols/PTToolManagerDelegate.html#/c:objc\(pl\)PTToolManagerDelegate\(im\)toolManager:annotationAdded:onPageNumber:) [`-toolManager:annotationModified:onPageNumber:`](https://sdk.apryse.com/api/ios/Protocols/PTToolManagerDelegate.html#/c:objc\(pl\)PTToolManagerDelegate\(im\)toolManager:annotationModified:onPageNumber:) [`-toolManager:annotationRemoved:onPageNumber:`](https://sdk.apryse.com/api/ios/Protocols/PTToolManagerDelegate.html#/c:objc\(pl\)PTToolManagerDelegate\(im\)toolManager:annotationRemoved:onPageNumber:) These methods are called just after an annotation is added, modified or deleted.


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