iOS 9 App freeze with console log “BKSendHIDEvent”

Question

After app launched for a long time, there are some logs in console while touching the screen:

BKSendHIDEvent: IOHIDEventSystemConnectionDispatchEvent error:0xE

Answer 1

I have got fix for that... In My case using swift, with Xcode 7.2. I have used custom label, and func layoutSubviews() call infinite time and console is showing BKSendHIDEvent: IOHIDEventSystemConnectionDispatchEvent

below is fix for same:

class CustomLabel: UILabel {

 var isSubLayoutSet: Bool = false

    override internal init(frame: CGRect) {
        super.init(frame: frame)

    }
    required internal init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }

    override func layoutSubviews() {
        super.layoutSubviews()

        if isSubLayoutSet == false
        {
            //--- do your stuff related to set font or any operation...
            ///---
            isSubLayoutSet = true
        }
    }

Answer 2

I have the same problem.

In My case it happends after switch off wifi in iPad (OS 9.1). Application is unresponsive. In console I can see the same errors.

After switch wifi on, application is again responsive and I can continue.

Answer 3

fyi, i'm seeing the same console output "unknown event dropped" after updating to iOS 9.3. I'm not sure if it's the OS, or a specific app running a background process, but I see it in many different apps including the home screen as well as immediately on restarting, so I think it's a bug in the latest 9.3 update.