诀窍是使用bindMemory函数：
func write(_ data: Data) -> Int {
return data.withUnsafeBytes({ (rawBufferPointer: UnsafeRawBufferPointer) -> Int in
let bufferPointer = rawBufferPointer.bindMemory(to: UInt8.self)
return self.write(bufferPointer.baseAddress!, maxLength: data.count)
})
}
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