How do I write universal Swift code for both iOS and macOS. In cocoa I could use #ifdef, what do I do now?

Question

For our project we always used one source file for both platforms: iOS and macOS (previously OS X). Right now I am migrating to Swift. Unfortunately there is some files which need

import Cocoa

and on iOS

import UIKit

previously we did

#ifdef __MAC_OS_X_VERSION_MAX_ALLOWED
#import <Cocoa/Cocoa.h>
#else
#import <UIKit/UIKit.h>
#endif

How can this be done in Swift? I don't like to write each class twice just because there is no macros anymore.

score 29 · Accepted Answer · edited Sep 14 '17 at 11:12

29

Use:

#if os(OSX)
    import Cocoa
#elseif os(iOS)
    import UIKit
#endif

edited Sep 14 '17 at 11:12

David Snabel-Caunt

57,804
13
114
132

answered Oct 13 '14 at 12:12

Kirsteins

27,065
8
76
78

Does that finally mean, that there is still a preprocessor build in with swift? – JackPearse Oct 13 '14 at 12:22
2

Check out "Preprocessor directives" in the manual: https://developer.apple.com/library/ios/documentation/Swift/Conceptual/BuildingCocoaApps/InteractingWithCAPIs.html#//apple_ref/doc/uid/TP40014216-CH8-XID_20 – Kirsteins Oct 13 '14 at 12:24
Oh, I didn't see this chapter. This is quite helpful. Thanks a lot. – JackPearse Oct 13 '14 at 12:27
Is there an even better way to make it one liner? ;) – hyouuu May 10 '18 at 00:30

score 6 · Answer 2 · answered Nov 15 '20 at 12:55

6

Since os(OSX) does not work any more on Swift 5/Xcode 12 use:

#if os(macOS)
    import Cocoa
#elseif os(iOS)
    import UIKit
#endif

answered Nov 15 '20 at 12:55

gundrabur

843
10
12

How do I write universal Swift code for both iOS and macOS. In cocoa I could use #ifdef, what do I do now?

2 Answers2

Linked