无法将类型'Int'的值转换为预期的参数类型'（inout UnsafeMutableBufferPointer <_>，inout Int）throws-> Void'

Question

此行var machine = [CChar](_unsafeUninitializedCapacity: size, initializingWith: 0)抛出错误。

错误消息：

  

无法将类型'Int'的值转换为预期的参数类型'（inout UnsafeMutableBufferPointer <_>，inout Int）throws-> Void'

这是我的代码：

struct MailTemplate {
    let destination = "test@gmail.com"
    let subject = "Test"
    let body:String

    init(){
        let appVersion: String! = Bundle.main.object(forInfoDictionaryKey: "CFBundleShortVersionString") as? String
        var platform: String {
            var size: Int = 0
            sysctlbyname("hw.machine", nil, &size, nil, 0)
            var machine = [CChar](_unsafeUninitializedCapacity: size, initializingWith: 0)
            sysctlbyname("hw.machine", &machine, &size, nil, 0)
            return String.fromCString(machine)!
        }
        body = "Email Body"
    }
} 

Answer 1

inout参数是将要由我们传递给它的函数修改的参数。因此，您需要将其作为&size传递。

Answer 2

我得到了答案

initializingWith: {_,_ in}

喜欢：

var machine = [CChar](_unsafeUninitializedCapacity: size, initializingWith: {_,_ in})