UIPickerView: CALayer boundaries contain NaN: [0 nan; 200,291]

Question

I have one question about UIPickerView when I write

[self.pickView selectRow:[[FCUserInfo teachYears] integerValue]-1 inComponent:0 animated:NO]; 

He crashed like this:

CALayer boundaries contain NaN: [0 nan; 200,291]

This happens sometimes, I don’t know what to do, so thanks ereryone who can help me!