斯威夫特5.2.4 Xcode 11.7

 #if targetEnvironment(simulator)

 #endif

从Swift 1.0开始，对我来说有用的是检查除了arm之外的架构:

#if arch(i386) || arch(x86_64)

     //simulator
#else 
     //device

#endif

swift 4.1已过时。请改用#if targetEnvironment(模拟器)。源

要检测Swift中的模拟器，您可以使用构建配置:

在Swift Compiler中定义此配置- d IOS_SIMULATOR - Custom Flags >其他Swift Flags 在下拉菜单中选择Any iOS Simulator SDK

现在你可以使用这个语句来检测模拟器:

#if IOS_SIMULATOR
    print("It's an iOS Simulator")
#else
    print("It's a device")
#endif

你也可以扩展UIDevice类:

extension UIDevice {
    var isSimulator: Bool {
        #if IOS_SIMULATOR
            return true
        #else
            return false
        #endif
    }
}
// Example of usage: UIDevice.current.isSimulator

我在Swift 3中使用了下面的代码

if TARGET_IPHONE_SIMULATOR == 1 {
    //simulator
} else {
    //device
}

来自Xcode 9.3

#if targetEnvironment(simulator)

Swift supports a new platform condition targetEnvironment with a single valid argument simulator. Conditional compilation of the form '#if targetEnvironment(simulator)' can now be used to detect when the build target is a simulator. The Swift compiler will attempt to detect, warn, and suggest the use of targetEnvironment(simulator) when evaluating platform conditions that appear to be testing for simulator environments indirectly, via the existing os() and arch() platform conditions. (SE-0190)

iOS 9+：

extension UIDevice {
    static var isSimulator: Bool {
        return NSProcessInfo.processInfo().environment["SIMULATOR_DEVICE_NAME"] != nil
    }
}

斯威夫特3:

extension UIDevice {
    static var isSimulator: Bool {
        return ProcessInfo.processInfo.environment["SIMULATOR_DEVICE_NAME"] != nil
    }
}

iOS 9之前:

extension UIDevice {
    static var isSimulator: Bool {
        return UIDevice.currentDevice().model == "iPhone Simulator"
    }
}

objective - c:

@interface UIDevice (Additions)
- (BOOL)isSimulator;
@end

@implementation UIDevice (Additions)

- (BOOL)isSimulator {
    if([[NSProcessInfo processInfo] isOperatingSystemAtLeastVersion:(NSOperatingSystemVersion){9, 0, 0}]) {
        return [NSProcessInfo processInfo].environment[@"SIMULATOR_DEVICE_NAME"] != nil;
    } else {
        return [[self model] isEqualToString:@"iPhone Simulator"];
    }
}

@end

下面是一个基于HotJard上面的精彩答案的Xcode 11 Swift示例，这也添加了一个isDevice Bool，并使用SIMULATOR_UDID而不是name。变量赋值是在每一行上完成的，这样你就可以更容易地在调试器中检查它们。

import Foundation

// Extensions to UIDevice based on ProcessInfo.processInfo.environment keys
// to determine if the app is running on an actual device or the Simulator.

@objc extension UIDevice {
    static var isSimulator: Bool {
        let environment = ProcessInfo.processInfo.environment
        let isSimulator = environment["SIMULATOR_UDID"] != nil
        return isSimulator
    }

    static var isDevice: Bool {
        let environment = ProcessInfo.processInfo.environment
        let isDevice = environment["SIMULATOR_UDID"] == nil
        return isDevice
    }
}

还有DTPlatformName的字典条目，它应该包含模拟器。