我正在尝试检查用户是否有互联网连接,并且该过程的一部分涉及调用withUnsafePointer
. 在 Swift 1.x 中,我可以使用:
var zeroAddress = sockaddr_in(sin_len: 0, sin_family: 0, sin_port: 0, sin_addr: in_addr(s_addr: 0), sin_zero: (0, 0, 0, 0, 0, 0, 0, 0))
zeroAddress.sin_len = UInt8(sizeofValue(zeroAddress))
zeroAddress.sin_family = sa_family_t(AF_INET)
let defaultRouteReachability = withUnsafePointer(&zeroAddress){
SCNetworkReachabilityCreateWithAddress(nil, UnsafePointer($0)).takeRetainedValue()
}
但是现在使用 Swift 2,我收到一条错误消息
无法使用类型为“(inout sockaddr_in,(_)-> _)”的参数列表调用“withUnsafePointer”
我查看了Xcode的用法,即:
所以我尝试使用
withUnsafePointer(&zeroAddress) {(pointer: UnsafePointer<sockaddr_in>) -> sockaddr_in in
SCNetworkReachabilityCreateWithAddress(nil, pointer).takeRetainedValue()
}
也
withUnsafePointer(&zeroAddress) {(pointer: UnsafePointer<sockaddr_in>) -> AnyObject in
SCNetworkReachabilityCreateWithAddress(nil, pointer).takeRetainedValue()
}
他们都给出了cannot invoke...
编译时错误。withUnsafePointer
在 Swift 2.x中使用的正确方法是什么?