iOS-获得目录下的所有文件名并进行文件替换

for (Book *book in postilBooksArr) {  //待操作的文件
   NSString *path = [NSString stringWithFormat:@"%@%ld/",kBookFilePath,book.sid];  //文件所在路径
   NSFileManager *fileManager = [NSFileManager defaultManager];
   NSDirectoryEnumerator *enumerator = [fileManager enumeratorAtPath:path];  // 划重点
   for (NSString *fileName in enumerator) { //  fileName 就是遍历到的每一个文件文件名
        if ([fileName hasPrefix:@"zztemp_"]) {
           NSString *moveFileName = [fileName stringByReplacingOccurrencesOfString:@"temp_" withString:@""];
           NSString *moveToPath = [path stringByAppendingPathComponent:[NSString stringWithFormat:@"%@",moveFileName]];  // 替换的文件的终极路径
           [fileManager removeItemAtPath:moveToPath error:nil]; // 将终极路径的文件删除
           NSString *filePath = [path stringByAppendingPathComponent:[NSString stringWithFormat:@"%@",fileName]]; //用于替换的文件的路径
           [fileManager moveItemAtPath:filePath toPath:moveToPath error:nil]; // 替换
         }
    }
}