错误：“无法调用初始化程序”，仅在Watch OS上执行该功能

I declared a failable initializer in my 'HealthKitService' which is, as the name says, a utility class for HealthKit. The problem is that certain HealthKit classes such as HKWorkoutSession, are available for Watch OS only, so I had to use a preprocessor directive to make a function available for Watch OS only:

我在我的'HealthKitService'中声明了一个可用的初始化程序，正如名称所示，它是HealthKit的实用程序类。问题是某些HealthKit类（如HKWorkoutSession）仅适用于Watch OS，因此我必须使用预处理程序指令才能为Watch OS提供一个函数：

#if TARGET_OS_WATCH
init?(activity:String) {
    // Here I initialize my HKWorkoutSession object
}
#endif

But if I call this initializer from the WatchKit extension app, this way:

但是，如果我从WatchKit扩展应用程序调用此初始化程序，这样：

if let service = HealthKitService(activity: activity) {
    // Do something with it
}

I receive this error:

我收到此错误：

Cannot invoke initializer for type 'HealthKitService' with an argument list of type '(activity: String)'

无法使用类型为“（activity：String）”的参数列表调用类型为“HealthKitService”的初始值设定项

PS: The deployment target is Watch OS 3.2, Swift version: 3.

PS：部署目标是Watch OS 3.2，Swift版本：3。

1 个解决方案

#1

Try #if os(watchOS) instead of #if TARGET_OS_WATCH.

尝试#if os（watchOS）而不是#if TARGET_OS_WATCH。