> 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. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation by asking a question. Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters: ``` GET https://docs.apryse.com/ios/annotation/tool-manager-events.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.