夫特：使C函數（SCNetworkReachabilityCallBack）

Question

我試圖調用SCNetworkReachabilitySetCallback所述第二參數，其中是SCNetworkReachabilityCallBack

在Swiftified SCNetworkReachability.h，這被定義爲：

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

在Objective-C，我會聲明一個函數，如：

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

並將其作爲參數傳遞。 I'n斯威夫特似乎我應該通過與簽名封閉在SCNetworkReachabilityCallBack定義是這樣的：

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

但是這給了錯誤：

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

這是有點令人費解！

是否有其他人遇到此問題或有解決方案？

Answer 1

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