# setURLSchemeHandler(_:forURLScheme:) Registers an object to load resources associated with the specified URL scheme. ``` func setURLSchemeHandler(_ urlSchemeHandler: (any WKURLSchemeHandler)?, forURLScheme urlScheme: String) ``` ## Parameters `urlSchemeHandler` The object to handle the URL scheme. This object must adopt the [`WKURLSchemeHandler`](/documentation/WebKit/WKURLSchemeHandler) protocol. `urlScheme` The URL scheme to handle. Scheme names are case sensitive, must start with an ASCII letter, and may contain only ASCII letters, numbers, the “`+`” character, the “`-`” character, and the “`.`” character. This method raises an if the scheme name is an empty string or contains any other characters. It is a programmer error to register a handler for a scheme WebKit already handles, such as `https` , and this method raises an if you try to do so. To determine whether WebKit handles a specific scheme, call the [`handlesURLScheme(_:)`](/documentation/WebKit/WKWebView/handlesURLScheme(_:)) class method of [`WKWebView`](/documentation/WebKit/WKWebView) . ## Discussion Use this method to register any custom resource types that your web content uses. For example, you might register a custom URL scheme for resources that you provide programmatically from your app. It is a programmer error to call this method more than once for the same scheme. > Tip: > To prevent future conflicts with WebKit, include the name of your app or company in any custom scheme names. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)