IoT_iOS source code issue

I'm building a new project with Swift 4, with reference to the source code.
I came across with a section that is written in Objective C.
Would like to know how to write that part in terms of Swift. Any help would be greatly appreciated.

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Source code (in GyroscopeSensorViewController.m)
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(void) parseData:(NSData*)data {
UInt8 reportID, sensorState, sensorEvent;
[[data subdataWithRange:NSMakeRange(0, 1)] getBytes:&reportID length:1];
[[data subdataWithRange:NSMakeRange(1, 1)] getBytes:&sensorState length:1];
[[data subdataWithRange:NSMakeRange(2, 1)] getBytes:&sensorEvent length:1];

int16_t x, y, z;
[[data subdataWithRange:NSMakeRange(3, 2)] getBytes:&x length:2];
[[data subdataWithRange:NSMakeRange(5, 2)] getBytes:&y length:2];
[[data subdataWithRange:NSMakeRange(7, 2)] getBytes:&z length:2];

float _x, _y, _z;
_x = (float) x / 16.4f;
_y = (float) y / 16.4f;
_z = (float) z / 16.4f;

lastValueX = _x;
lastValueY = _y;
lastValueZ = _z;

rotateX += (lastValueX) / self.gyroscopeRate;
rotateY += (lastValueY) / self.gyroscopeRate;
rotateZ += (lastValueZ) / self.gyroscopeRate;

//NSLog(@"ROT %.2f %.2f %.2f => %.2f %.2f %.2f (%d)", lastValueX, lastValueY, lastValueZ, rotateX, rotateY, rotateZ, self.gyroscopeRate);

FLog(@"GYR\t%.2fdeg\t%.2fdeg\t%.2fdeg", _x/self.gyroscopeRate, _y/self.gyroscopeRate, _z/self.gyroscopeRate);

isDirty = TRUE;
}