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iOS 跨平台代码 - 条件编译

  • 2026-02-02 16:16:48
iOS 跨平台代码 - 条件编译

在 iOS 开发中,跨平台代码的条件编译是构建通用框架和组件的常见需求。当你需要针对不同的 Apple 系统平台进行代码适配时,#if canImport(UIKit) && !os(watchOS) 和 #if os(iOS) 这两种条件编译写法各有适用场景。本文将深入解析它们的本质区别,并提供清晰的选用指南。

背景:Apple 生态中的 UI 框架分布

要理解这两种写法的区别,首先需要了解 Apple 各系统中 UI 框架的分布:

系统平台
原生 UI 框架
UIKit 支持情况
编译条件
iOS (iPhone)
UIKit
原生支持
os(iOS)
iPadOS
UIKit
原生支持
os(iOS)
 (编译时与 iOS 相同)
tvOS
UIKit
原生支持
os(tvOS)
macOS
AppKit
通过 Catalyst (Mac Catalyst) 支持
os(macOS)
 或 targetEnvironment(macCatalyst)
watchOS
WatchKit
不支持 UIKit
os(watchOS)

关键点

  1. 虽然 iPadOS 是独立的操作系统,但在编译时仍使用 os(iOS) 宏
  2. UIKit 是 iOS、iPadOS、tvOS 的原生框架,但通过 Mac Catalyst 也可以在 macOS 上运行
  3. watchOS 完全不支持 UIKit

两种写法的本质逻辑分析

#if os(iOS):基于系统类型的精确判断

这种写法检查编译目标是否为 iOS 系统(包含 iPhone 和 iPad)。

#if os(iOS)// 这里的代码会在 iOS 和 iPadOS 设备上编译#endif

优点:

  • 逻辑简单直观,可读性高
  • 对于 iOS/iPadOS 平台的功能非常合适

缺点:

  • 不包含 tvOS(尽管 tvOS 也支持 UIKit)
  • 不包含 macOS Catalyst(它支持 UIKit 但系统不是 iOS)

#if canImport(UIKit) && !os(watchOS):基于框架可用性的智能适配

这种写法首先检查能否导入 UIKit 框架,然后主动排除 watchOS。

#if canImport(UIKit) && !os(watchOS)// 这里的代码会在所有支持 UIKit 的平台上编译// 包括:iOS、iPadOS、tvOS、macOS Catalyst#endif

优点:

  1. 最大兼容性:覆盖所有支持 UIKit 的系统(iOS、iPadOS、tvOS、macOS Catalyst)
  2. 面向未来:如果 Apple 推出新系统支持 UIKit,此条件自动适配
  3. 明确排除!os(watchOS) 让意图更清晰,即使 canImport(UIKit) 在 watchOS 上已经返回 false

缺点:

  • 比 os(iOS) 稍复杂,但可读性依然优秀

实际代码示例

通用 UIKit 扩展(推荐使用 canImport 写法)

// 适配所有支持 UIKit 的平台,排除 watchOS#if canImport(UIKit) && !os(watchOS)import UIKit// 这是一个所有 UIKit 平台都能用的通用扩展extensionUIViewController{funcshowAlert(title: String, message: String) {let alert = UIAlertController(            title: title,            message: message,            preferredStyle: .alert        )        alert.addAction(UIAlertAction(title: "OK", style: .default))        present(alert, animated: true)    }}#endif

iOS/iPadOS 专属功能(使用 os(iOS) 写法)

// 仅针对 iOS 和 iPadOS 系统#if os(iOS)import UIKit// 适用于 iOS/iPadOS 的功能extensionUIDevice{var isPhone: Bool {return userInterfaceIdiom == .phone    }var isPad: Bool {return userInterfaceIdiom == .pad    }functriggerHapticFeedback(style: UIImpactFeedbackGenerator.FeedbackStyle) {let generator = UIImpactFeedbackGenerator(style: style)        generator.impactOccurred()    }}#endif

运行时设备类型判断

由于编译时无法通过 os(iPadOS) 判断,需要在运行时区分设备类型:

#if os(iOS)import UIKit// 运行时判断设备类型funcdeviceSpecificBehavior() {switchUIDevice.current.userInterfaceIdiom {case .phone:// iPhone 专属逻辑print("Running on iPhone")case .pad:// iPad 专属逻辑print("Running on iPad")default:break    }}#endif

总结

掌握这两种条件编译写法的适用场景,能帮助你编写更清晰、更健壮的跨平台代码,提升代码的可维护性和可读性。如果考虑未来兼容性,使用基于框架可用性的判断(canImport)比基于系统版本的判断(os())更具前瞻性。未来 Apple 推出新系统但支持 UIKit,代码无需修改就能适配。

About the Author

龚阳 /Gong Yang

Gong Yang is an experienced MBaaS iOS technologist specializing in mobile development. He is proficient in Swift and Objective-C programming languages and their ecological frameworks, and familiar with various software design patterns and architectures. With rich hands-on experience, he is especially good at functional programming, SwiftUI and cross-platform technology development.

Copyright

This article was originally written by Klilala Group and its affiliates and is copyrighted by Klilala Group. Anyone wishing to reproduce, abstract or otherwise quote the contents of this article must obtain the express authorization and written permission of Klilala Group, and indicate the source of reproduction when doing so. Any unauthorized reproduction or use of this article will result in legal liability.

For authorization, please contact us at

group@klilala-inc.com

028-67876790

Thank you for your understanding and support!

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  1. CONNECT:[ UseTime:0.000804s ] mysql:host=127.0.0.1;port=3306;dbname=c_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001660s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000710s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000692s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001524s ]
  6. SELECT * FROM `set` [ RunTime:0.000647s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001679s ]
  8. SELECT * FROM `article` WHERE `id` = 462383 LIMIT 1 [ RunTime:0.001015s ]
  9. UPDATE `article` SET `lasttime` = 1770241570 WHERE `id` = 462383 [ RunTime:0.011342s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000692s ]
  11. SELECT * FROM `article` WHERE `id` < 462383 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001116s ]
  12. SELECT * FROM `article` WHERE `id` > 462383 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001084s ]
  13. SELECT * FROM `article` WHERE `id` < 462383 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.011204s ]
  14. SELECT * FROM `article` WHERE `id` < 462383 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003580s ]
  15. SELECT * FROM `article` WHERE `id` < 462383 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001529s ]
0.201896s