Type Property
平台-platform
运行提供者的平台。
必需 提供的默认执行。
The platform on which to run the provider.
Required.Default implementation provided.
说明-Declaration
static var platform: PreviewPlatform? { get }
讨论-Discussion
如果预览提供者对这个属性返回nil，Xcode会根据定义了PreviewProvider的文件来推断平台。只有当文件在一个支持多个平台的目标中时，才返回nil。
If the preview provider returns
nilfor this property, Xcode infers the platform based on the file in which thePreviewProvideris defined. Returnnilonly when the file is in a target that supports multiple platforms.
默认实现-Default Implementations
- PreviewProvider实现-
static var platform: PreviewPlatform?
运行供应商的平台。
The platform on which to run the provider.
平台- platform
运行提供者的平台。
The platform on which to run the provider.
说明-Declaration
static var platform: PreviewPlatform? { get }
讨论-Discussion
如果预览提供者对这个属性返回nil，Xcode会根据定义了PreviewProvider的文件来推断平台。只有当文件在一个支持多个平台的目标中时，才返回nil。
If the preview provider returns
nilfor this property, Xcode infers the platform based on the file in which thePreviewProvideris defined. Returnnilonly when the file is in a target that supports multiple platforms.