---
title: "application(_:open:options:)"
framework: uikit
role: symbol
role_heading: Instance Method
path: "uikit/uiapplicationdelegate/application(_:open:options:)"
---

# application(_:open:options:)

Asks the delegate to open a resource specified by a URL, and provides a dictionary of launch options.

## Declaration

```swift
optional func application(_ app: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey : Any] = [:]) -> Bool
```

## Parameters

- `app`: Your singleton app object.
- `url`: The URL resource to open. This resource can be a network resource or a file. For information about the Apple-registered URL schemes, see https://developer.apple.com/library/archive/featuredarticles/iPhoneURLScheme_Reference/Introduction/Introduction.html#//apple_ref/doc/uid/TP40007899.
- `options`: A dictionary of URL handling options. For information about the possible keys in this dictionary and how to handle them, see UIApplicationOpenURLOptionsKey. By default, the value of this parameter is an empty dictionary.

## Mentioned in

Enabling document sharing

## Return Value

Return Value true if the delegate successfully handled the request or false if the attempt to open the URL resource failed.

## Discussion

Discussion This method is not called if your implementations return false from both the application(_:willFinishLaunchingWithOptions:) and application(_:didFinishLaunchingWithOptions:) methods. (If only one of the two methods is implemented, its return value determines whether this method is called.) If your app implements the applicationDidFinishLaunching(_:) method instead of application(_:didFinishLaunchingWithOptions:), this method is called to open the specified URL after the app has been initialized. If a URL arrives while your app is suspended or running in the background, the system moves your app to the foreground prior to calling this method. There is no equivalent notification for this delegation method.

## See Also

### Opening a URL-specified resource

- [UIApplication.OpenURLOptionsKey](uikit/uiapplication/openurloptionskey.md)