通过Swift中的Multipeer Connectivity临时同步两个iOS设备

Question

I would like to temporally synchronize two iOS devices using Multipeer Connectivity (so it should work for both WIFI and Bluetooth) in Swift.

Ideally, I would need a synchronisation within 0.03 ms, but 0.3 ms would be acceptable.

So far, I am playing a sound from device 1 and record it with device 2, measuring the time from the moment when the devices are connected with each other over Multipeer Connectivity.

Unfortunately, this does not provide the accurate temporal synchronization needed for my application.

Answer 1

Just send the current time from one device and then compare it on the other side when the message is received.

Preparing message:

// this is the value to send    
let date = NSDate()

On the message received code:

let interval = NSDate.timeIntervalSinceDate(theDate)

That interval is the time passed since the initial date was created on the other device.