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類似Java的lastIndexOf

[@"abc def ghi abc def ghi" rangeOfString:@"abc" options:NSBackwardsSearch];

會回傳最後一個符合的NSRange

 

example:

NSString *file = @"/document/test/folder/file.txt”;

NSString *onlyPath = [file substringToIndex:[file rangeOfString:@"/" options:NSBackwardsSearch].location];

onlyPath = /document/test/folder

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