NSRangeException与NSArray objectAtIndex，索引超出范围

Question

谁能告诉我以下错误在iOS Objective-C中的含义：

Terminating app due to uncaught exception 'NSRangeException', reason: '-[NSCFArray objectAtIndex:]: index (13) beyond bounds (13)'

Answer 1

It means that your index is not within the valid range for your array. Your array has 13 elements and you are trying to access the 14th element. In C, indexes start at 0, so arrays have indexes that are valid from 0 to length - 1.

This is typically caused by an off by one error .