Question

因为我将我的代码转换为Swift 3，所以会发生错误。

'init is unavailable: use 'withMemoryRebound(to:capacity:_)' to temporarily view memory as another layout-compatible type.

这是我的代码：

func parseHRMData(data : NSData!)
{
    var flags : UInt8
    var count : Int = 1
    var zw = [UInt8](count: 2, repeatedValue: 0)

    flags = bytes[0]
    /*----------------FLAGS----------------*/
        //Heart Rate Value Format Bit
        if([flags & 0x01] == [0 & 0x01])
        {
            //Data Format is set to UINT8
            //convert UINT8 to UINT16
            zw[0] = bytes[count]
            zw[1] = 0
            bpm = UnsafePointer<UInt16>(zw).memory

            print("HRMLatitude.parseData Puls(UINT8): \(bpm)BPM")

            //count field index
            count = count + 1
        }

如何解决此错误？

提前致谢！

Answer 1

zw是UInt8的数组。重新解释指向元素的指针存储作为指向UInt16的指针，withMemoryRebound()必须是在Swift 3中调用。在你的情况下：

var zw = [UInt8](repeating: 0, count: 2)
// Alternatively:
var zw: [UInt8] = [0, 0]

// ...

let bpm = UnsafePointer(zw).withMemoryRebound(to: UInt16.self, capacity: 1) {
    $0.pointee
}

另一种解决方案是

let bpm = zw.withUnsafeBytes {
    $0.load(fromByteOffset: 0, as: UInt16.self)
}

请参阅SE-0107 UnsafeRawPointer API 有关原始指针，类型指针和重新绑定的更多信息。

'init不可用：使用'withMemoryRebound（to：capacity：_）'临时查看内存作为另一种布局兼容类型

1 个答案: