在Swift中处理UnsafePointer的EXC_BAD_ACCESS

Question

我如何处理EXC_BAD_ACCES。

这是我的代码：

func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {
    if characteristic.uuid.uuidString == "9953240D-41CF-4F4E-8C82-EE75E6D43B6B" {
        let value = characteristic.value!.withUnsafeBytes { (pointer: UnsafePointer<Int>) -> Int in
            return pointer.pointee
    }
    print ("VALUE 1: \(value)")
}

  

线程1：EXC_BAD_ACCESS（代码= 1，地址= 0xbad0）在行＆＃34;返回pointer.pointee＆＃34;