iPhone says that the charger accessory may not be supported.

So I am using a charger that is not from apple, and it is not super layered and stuff, I have been using it for half a year and it worked fine. Until last night I went to charge my iPhone as it was at 15%, it said that this accessory may not be supported. It has not happened before and I don't know why. I don't have another charger and tried restarting and changing the adapter which is from apple. Nothing worked and my iPhone is just dead. Please help?!?

[Re-Titled by Moderator]