What's wrong with my #if TARGET_OS_SIMULATOR code for Realm path definition?

Question

I have this code

 #if TARGET_OS_SIMULATOR
let device = false
let RealmDB = try! Realm(path: "/Users/Admin/Desktop/realm/Realm.realm")
#else
let device = true
let RealmDB = try! Realm()
#endif

device bool works fine, yet RealmDB works only for else condition.

score 44 · Answer 1 · edited Jan 20 '20 at 15:27

As of Xcode 9.3+ Swift now supports #if targetEnvironment(simulator) to check if you're building for Simulator.

Please stop using architecture as a shortcut for simulator. Both macOS and the Simulator are x86_64 which might not be what you want.

// ObjC/C:
#if TARGET_OS_SIMULATOR
    // for sim only
#else
    // for device
#endif


// Swift:
#if targetEnvironment(simulator)
    // for sim only
#else
    // for device
#endif

score 11 · Accepted Answer · answered Mar 24 '16 at 14:09

11

TARGET_IPHONE_SIMULATOR macro doesn't work in Swift. What you want to do is like the following, right?

#if arch(i386) || arch(x86_64)
let device = false
let RealmDB = try! Realm(path: "/Users/Admin/Desktop/realm/Realm.realm")
#else
let device = true
let RealmDB = try! Realm()
#endif

answered Mar 24 '16 at 14:09

kishikawa katsumi

10,193
1
40
51

Please don't use architecture as a shortcut for simulator. – russbishop Sep 26 '17 at 22:56
1

Swift has targetEnvironment. This is no longer the correct way to define the simulator. – Eric Dec 03 '18 at 18:56

score 6 · Answer 3 · answered Nov 08 '17 at 17:00

Please see this post. This is the correct way to do it and it's well explained

https://samsymons.com/blog/detecting-simulator-builds-in-swift/

Basically define a variable named as you like (maybe 'SIMULATOR') to be set during run in simulator. Set it in Build Settings of Target, under Active Compilation Conditions- > Debug then (+) then choose Any iOS Simulator SDK in the dropdown list, then add the variable.

Then in your code

var isSimulated = false
#if SIMULATOR
  isSimulated = true // or your code
#endif

score 0 · Answer 4 · edited May 22 '19 at 02:04

0

More explanation about this issue is here. I am using this approach:

struct Platform {
        static let isSimulator: Bool = {
            var isSim = false
            #if arch(i386) || arch(x86_64)
                isSim = true
            #endif
            return isSim
        }()
    }

    // Elsewhere...

    if Platform.isSimulator {
        // Do one thing
    }
    else {
        // Do the other
    }

Or create a utility class:

class SimulatorUtility
{

    class var isRunningSimulator: Bool
    {
        get
        {
             return TARGET_OS_SIMULATOR != 0// for Xcode 7
        }
    }
}

edited May 22 '19 at 02:04

donjuedo

2,437
16
27

answered Mar 23 '16 at 14:20

Oleg Gordiichuk

14,647
5
57
94

thank you for reply! the thing is that i can put that "if Platform.isSimulator" inside some class, yet i need to set that constant "let RealmDB..." on the top level right after "import RealmSwift". – alexey Mar 23 '16 at 14:45
Please do NOT use architecture as a shortcut for simulator. – russbishop Sep 26 '17 at 22:56

What's wrong with my #if TARGET_OS_SIMULATOR code for Realm path definition?

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