> For the complete documentation index, see [llms.txt](https://lochiwei.gitbook.io/ios/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://lochiwei.gitbook.io/ios/swiftui/view/environment.md).

# view environment

[SwiftUI](/ios/swiftui.md) ⟩ [view](/ios/swiftui/view.md) ⟩ environment

{% hint style="success" %}
A <mark style="color:purple;">view's environment</mark> provides access to the view's [environment values](https://developer.apple.com/documentation/swiftui/environmentvalues).&#x20;
{% endhint %}

A view <mark style="color:yellow;">inherits</mark> its <mark style="color:purple;">environment</mark> from its [container view](/ios/swiftui/view/hierarchy/container.md)：&#x20;

* subject to <mark style="color:yellow;">explicit changes</mark> from an [`environment(_:_:)`](https://developer.apple.com/documentation/swiftui/view/environment\(_:_:\)) view modifier,&#x20;
* or by <mark style="color:red;">implicit changes</mark> from one of the many [modifiers](/ios/swiftui/view/modifier.md) that operate on [environment values](/ios/swiftui/view/environment/value.md).&#x20;

As a result, you can <mark style="color:yellow;">configure a entire hierarchy of views</mark> by <mark style="color:yellow;">modifying</mark> the <mark style="color:purple;">environment</mark> of the group’s [container](/ios/swiftui/view/hierarchy/container.md).

```swift
// read values from environment
@Environment(\.colorScheme) var colorScheme: ColorScheme
```

{% tabs %}
{% tab title="🔴 主題" %}

* [@StateObject](/ios/swiftui/view/state/object/stateobject.md)：declare & init a [state object](/ios/swiftui/view/state/object.md)
* [@Environment](/ios/swiftui/view/environment/environment.md)：read an [environment value](/ios/swiftui/view/environment/value.md)&#x20;
* view[.environmentObject(\_:)](https://developer.apple.com/documentation/swiftui/scene/environmentobject\(_:\))：put an [environment object](/ios/swiftui/view/environment/object.md)&#x20;
* [@EnvironmentObject](/ios/swiftui/view/environment/environmentobject.md)：read an [environment object](/ios/swiftui/view/environment/object.md)&#x20;
  {% endtab %}

{% tab title="📘 手冊" %}

* [SwiftUI](https://developer.apple.com/documentation/swiftui) ⟩ [Environment values](https://developer.apple.com/documentation/swiftui/environment-values)
  {% endtab %}
  {% endtabs %}


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