arrays - 数组创建导致 'Type of expression is ambiguous without more context'

Question

我对 Swift 很陌生。如果我的问题听起来很愚蠢，请原谅。

我声明了一个结构如下:

struct RecorderState 
{
    var setupComplete: Bool
    var dataFormat: AudioStreamBasicDescription
    var queue: UnsafeMutablePointer<AudioQueueRef>
    var buffers: [AudioQueueBufferRef]
    var recordFile: AudioFileID
    var bufferByteSize: UInt32
    var currentPacket: Int64
    var isRunning: Bool
    var recordPacket: Int64
    var errorHandler: ((NSError) -> Void)?
}

现在我需要编写类的 init 方法来初始化其中的结构。

class SimplePCMRecorder : NSObject
{
    private var recorderState: RecorderState

    init(numberBuffers: Int)
    {
        self.recorderState = RecorderState(
            setupComplete: false,
            dataFormat: AudioStreamBasicDescription(),
            queue: UnsafeMutablePointer<AudioQueueRef>.alloc(1),
            buffers: Array<AudioQueueBufferRef>(repeating: 0, count: numberBuffers),
            recordFile:AudioFileID(),
            bufferByteSize: 0,
            currentPacket: 0,
            isRunning: false,
            recordPacket: 0,
            errorHandler: nil
        )
    }
}

问题是，错误“表达式类型在没有更多上下文的情况下不明确”继续显示在 buffers: Array<AudioQueueBufferRef>(repeating: 0, count: numberBuffers) 行上。

我尝试了其他方法，但还是一样。

从我在这里读到的内容 Error: 'Type of expression is ambiguous without more context'是编译器不知道对象的类型，因此它显示错误。但在这里，我已经声明了。

我尝试通过在构造函数方法后面添加 as 来再次转换它，但仍然不起作用。

我不明白为什么。我已将缓冲区变量的类型声明为 Array包含AudioQueueBufferRef 。但为什么编译器仍然无法检测到这一点？

Answer 1

由于 Martin R's上面评论。

class SimplePCMRecorder : NSObject
{
    private var recorderState: RecorderState
    init(numberBuffers: Int)
    {

        self.recorderState = RecorderState(
            setupComplete: false,
            dataFormat: AudioStreamBasicDescription(),
            queue: UnsafeMutablePointer<AudioQueueRef>.allocate(capacity: 1),
            buffers: Array<UnsafeMutablePointer<AudioQueueBuffer>>(repeating: UnsafeMutablePointer<AudioQueueBuffer>(bitPattern: 0)! , count: numberBuffers),
            recordFile:AudioFileID(bitPattern: 0)!,
            bufferByteSize: 0,
            currentPacket: 0,
            isRunning: false,
            recordPacket: 0,
            errorHandler: nil
        )
    }
}