ios - CFStreamCreateBoundPair 不能释放

Question

我使用 CFStreamCreateBoundPair创建一对流以上传大文件。代码如下。

let readStreamPointer = UnsafeMutablePointer<Unmanaged<CFReadStream>?>.alloc(1)
let writeStreamPointer = UnsafeMutablePointer<Unmanaged<CFWriteStream>?>.alloc(1)
let bufferSize = 1024*1024 //1M buffer size
CFStreamCreateBoundPair(kCFAllocatorDefault, readStreamPointer,writeStreamPointer, Int(bufferSize) as CFIndex)
if let rStream = readStreamPointer.memory?.takeRetainedValue(),writeStream = writeStreamPointer.memory?.takeRetainedValue() {

}

除内存问题外一切顺利。我使用 Instruments 检查并找出 CFStreamCreateBoundPair在 CFReadStream 之后无法释放缓冲区大小的内存，在本例中为 1M和 CFWriteStream已关闭。我也有屏幕截图。

我对 swift 中的 Core Foundation 框架不太熟悉，不知道为什么不能自动发布。

Answer 1

这是我的做法:

class func createBound(inputStream: inout InputStream?, outputStream: inout OutputStream?, bufferSize: UInt) {
    var readStream: Unmanaged<CFReadStream>?
    var writeStream: Unmanaged<CFWriteStream>?
    CFStreamCreateBoundPair(nil, &readStream, &writeStream, CFIndex(bufferSize))
    if inputStream != nil {
        inputStream = readStream!.takeUnretainedValue()
    }
    if outputStream != nil {
        outputStream = writeStream!.takeUnretainedValue()
    }
}