> For the complete documentation index, see [llms.txt](https://docs.wepin.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.wepin.io/en/widget-integration/ios-swift-sdk/widget-library/initialization.md).

# initialization

The method for initializing the Wepin iOS Widget Library is as follows.

Before creating an instance of `WepinWidget`, please pass the App ID and App Key to the `WepinWidgetParams` object as shown below.

```swift
let initWidgetParam = WepinWidgetParams(viewController: UIViewController, appId: appId, appKey: appKey)
```

Please create a `WepinWidget` instance by passing the previously created `WepinPinParams`.

```swift
var wepinWidget = WepinWidget(initWidgetParam);
```

After creating the `WepinWidget` instance, call the `initialize` method to complete the initialization.

```swift
await wepinWidget?.initialize(attributes: attributes)
```

#### parameters

&#x20;`attributes` \<WepinWidgetAttributes>

* `defaultLanguage` \<String>\
  The default language setting for the widget screen is `'en'`. Currently supported languages are `'ko'`, `'en'`, and `'ja'`.
* `defaultCurrency` \<String>\
  The default language setting for the widget screen is `'USD'`. Currently supported languages are `'KRW'`, `'USD'`, and `'JPY'`.

#### Return value

`<Bool>`\
Returns **true** if successful, and **false** if it fails.

### Example

```swift
let appKey: String = "Wepin-App-Key"
let appId: String = "Wepin-App-ID"
var wepinWidget: WepinWidget? = nil
let initWidgetParam = WepinWidgetParams(appId: appId, appKey: appKey)
wepinWidget = WepinWidget(initWidgetParam)
// Call initialize function
let attributes = WepinWidgetAttributes(defaultLanguage: "en", defaultCurrency: "USD")
if let res = try await wepinWidget?.initialize(attributes: attributes) {
    self.tvResult.text = "Successed: \(res)"
} else {
    self.tvResult.text = "Failed: No result returned from initialization"
}
```

## isInitialized

You can use the `isInitialized` method to check if the `WepinWidget` instance has been successfully initialized.

* \<Bool>\
  Returns **true** if initialization was successful and **false** if it failed.

```swift
let result = wepinWidget!.isInitialized()
```

## changeLanguage

```swift
wepinWidget!.changeLanguage("ko", currency: "KRW")
```

Changes the language displayed on the widget screen. Currently, only `'ko'`, `'en'`, and `'ja'` are supported.<br>

**Parameters**

* &#x20;`_ language` \<String>
* `currency` \<String> *optional*

### **Return value**

* \<Void>

### Example

```swift
wepinWidget!.changeLanguage("ko", currency: "KRW")
```