达尔文在这里描述了一切。TargetConditionals: https://github.com/apple/swift-corelibs-foundation/blob/master/CoreFoundation/Base.subproj/SwiftRuntime/TargetConditionals.h

TARGET_OS_SIMULATOR—生成的代码将在模拟器下运行

更新信息截至2018年2月20日

看起来@russbishop有一个权威的答案，使这个答案“不正确”-即使它似乎工作了很长一段时间。

检测应用程序是否正在构建的设备或模拟器在Swift

以前的回答

基于@WZW的回答和@Pang的评论，我创建了一个简单的实用结构。这个解决方案避免了@WZW的答案产生的警告。

import Foundation

struct Platform {

    static var isSimulator: Bool {
        return TARGET_OS_SIMULATOR != 0
    }

}

使用示例:

if Platform.isSimulator {
    print("Running on Simulator")
}

TARGET_IPHONE_SIMULATOR在iOS 9中已弃用。TARGET_OS_SIMULATOR是替换。TARGET_OS_EMBEDDED也是可用的。

从targetconditions .h:

#如果定义(__GNUC__) & &(定义(__APPLE_CPP__) | |定义(__APPLE_CC__) | | (__MACOS_CLASSIC__)定义) …… #定义TARGET_OS_SIMULATOR 0 #定义TARGET_OS_EMBEDDED #定义TARGET_IPHONE_SIMULATOR TARGET_OS_SIMULATOR /* deprecated */ #定义TARGET_OS_NANO TARGET_OS_WATCH

在现代系统中:

#if targetEnvironment(simulator)
    // sim
#else
    // device
#endif

就是这么简单。

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

斯威夫特5.2.4 Xcode 11.7

 #if targetEnvironment(simulator)

 #endif