IOS:主目录错误

Question

我有这个代码

NSString *nextSequentialFile =
    [filePath stringByReplacingOccurrencesOfString:photoNumber
    withString:[NSString stringWithFormat:@"%d", (index + 1)]
    options:NSBackwardsSearch
    range:[filePath rangeOfString:photoNumber options:NSBackwardsSearch]];

但是我有这个错误，我不明白，因为它发生了。

Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[NSCFString replaceOccurrencesOfString:withString:options:range:]: Range or index out of bounds'

Answer 1

尝试:

NSString *nextSequentialFile =
[filePath stringByReplacingOccurrencesOfString:photoNumber
withString:[NSString stringWithFormat:@"%d", (index + 1)]
options:NSBackwardsSearch
range:NSMakeRange(0, filePath.length)];