【iOS】String转化为Array，Array转化为Stri

将string字符串转换为array数组，断开分隔符为-

 NSArray  *array = [str componentsSeparatedByString:@"-"];

将array数组转换为string字符串，拼接分隔符为-

 NSString *str = [array componentsJoinedByString:@"-"];