ios - Swift:传递 C 函数 (SCNetworkReachabilityCallBack)

Question

我正在尝试调用 SCNetworkReachabilitySetCallback其中第二个参数为SCNetworkReachabilityCallBack

在 Swiftified 中 SCNetworkReachability.h ，这被定义为:

typealias SCNetworkReachabilityCallBack = CFunctionPointer<((SCNetworkReachability!, SCNetworkReachabilityFlags, UnsafeMutablePointer<Void>) -> Void)>

在 Objective-C 中，我将声明如下函数:

static void MYReachabilityCallback(SCNetworkReachabilityRef target, SCNetworkReachabilityFlags flags, void* info) {
    // do something
}

并将其作为参数传递。我是 Swift，看来我应该传递一个带有 SCNetworkReachabilityCallBack 中定义的签名的闭包，像这样:

let callback = { (target: SCNetworkReachability!, flags: SCNetworkReachabilityFlags, info: UnsafeMutablePointer<Void>) in
    // Do something
}

但这给出了错误:

Cannot convert the expression's type '(SCNetworkReachability!, SCNetworkReachabilityFlags, UnsafeMutablePointer) -> (SCNetworkReachability!, SCNetworkReachabilityFlags, UnsafeMutablePointer) -> $T0' to type '(SCNetworkReachability!, SCNetworkReachabilityFlags, UnsafeMutablePointer) -> (SCNetworkReachability!, SCNetworkReachabilityFlags, UnsafeMutablePointer) -> $T0'

这有点令人费解!

有没有其他人遇到过这个问题或有解决方案？

Answer 1

static void MYReachabilityCallback(SCNetworkReachabilityRef target, SCNetworkReachabilityFlags flags, void* info) {
        // do something
}