Never experienced this myself, but my opinion, based on what I've read here on FlyerTalk is thus:

1) Never put sensitive information directly on your device when you travel. Use cloud storage only. This gives you the option to actually divulge the pin or password for your device without actually compromising your data. Hint: If you use a cloud service, don't put the icon for it prominently on your home screen/desktop. In fact, you can uninstall the app prior to approaching customs (they're easy to uninstall and reinstall later), and their cursory examination of the device will show them nothing. Same goes for social media apps.

2) If at all possible, use throw-away devices when you travel, so you won't lose your primary devices if you're robbed, caught in a disaster, or have devices confiscated or compromised by authorities.

3) If your devices are confiscated by authorities, write them off. When they're returned to you, they will be security compromised and can never be trusted again. Run over them with a truck and recycle the remains.

4) From what I've read here on FT, if you refuse to divulge your pins and passwords, you can expect not only to have your devices confiscated, but to endure threats, coercion, lengthy delays re-entering the country, and extensive retaliatory screening and interviews. Be prepared.