在 Swift 中使用 UI_USER_INTERFACE_IDIOM() 检测当前设备 [英] Detect current device with UI_USER_INTERFACE_IDIOM() in Swift

问题描述

Swift 中 UI_USER_INTERFACE_IDIOM() 在 iPhone 和 iPad 之间检测的等价物是什么?

What is the equivalent of UI_USER_INTERFACE_IDIOM() in Swift to detect between iPhone and iPad?

在 Swift 中编译时出现 Use of unresolved identifier 错误.

I get an Use of unresolved identifier error when compiling in Swift.

推荐答案

使用 Swift 时，可以使用 enum UIUserInterfaceIdiom，定义为:

When working with Swift, you can use the enum UIUserInterfaceIdiom, defined as:

enum UIUserInterfaceIdiom : Int {
    case unspecified
    
    case phone // iPhone and iPod touch style UI
    case pad   // iPad style UI (also includes macOS Catalyst)
}

因此您可以将其用作:

UIDevice.current.userInterfaceIdiom == .pad
UIDevice.current.userInterfaceIdiom == .phone
UIDevice.current.userInterfaceIdiom == .unspecified

或者使用 Switch 语句:

Or with a Switch statement:

    switch UIDevice.current.userInterfaceIdiom {
    case .phone:
        // It's an iPhone
    case .pad:
        // It's an iPad (or macOS Catalyst)

     @unknown default:
        // Uh, oh! What could it be?
    }

UI_USER_INTERFACE_IDIOM() 是一个 Objective-C 宏，定义为:

UI_USER_INTERFACE_IDIOM() is an Objective-C macro, which is defined as:

#define UI_USER_INTERFACE_IDIOM()  ([[UIDevice currentDevice] respondsToSelector:@selector(userInterfaceIdiom)] ?  [[UIDevice currentDevice] userInterfaceIdiom] :  UIUserInterfaceIdiomPhone)

另外，请注意，即使在使用 Objective-C 时，UI_USER_INTERFACE_IDIOM() 宏也仅在面向 iOS 3.2 及更低版本时才需要.部署到 iOS 3.2 及更高版本时，您可以直接使用 [UIDevice userInterfaceIdiom].

Also, note that even when working with Objective-C, the UI_USER_INTERFACE_IDIOM() macro is only required when targeting iOS 3.2 and below. When deploying to iOS 3.2 and up, you can use [UIDevice userInterfaceIdiom] directly.

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