objective-c - componentsSeparatedByString 省略由分隔符包围的子字符串？

Question

我正在尝试在 componentsSeparatedByString 的帮助下划分由“-”分隔的输入

NSString *idInput = @"1-S2-1-8214685" //Actually input of a memory-rading operation

NSMutableArray *idBuf = [NSMutableArray arrayWithArray:[idInput componentsSeparatedByString:@"-"]];

但是，这似乎省略了第一个子字符串以及第三个子字符串，因为 idBuf 之后包含以下内容：

idBuf = {@"",@"S2",@"",@"8214685"}

如何获取两个丢失的子字符串？

整体功能：

+ (id) buildPlayerwithIdBuffer: (char*)idBuffer andPlayerName: (char*)playerName
{

NSString *idInput = [NSString stringWithUTF8String:idBuffer];
NSString *playerN = [NSString stringWithUTF8String:playerName];
NSString *uniqueServerId;

SFPlayer *resPlayer = [[self alloc]initWithPlayerName:playerN];

    NSMutableArray *idBuf = [NSMutableArray arrayWithArray:[idInput componentsSeparatedByString:@"-"]];
    //[idBuf removeObjectAtIndex:1];

    switch ([[idBuf objectAtIndex:0]characterAtIndex:0]) {
        case '1':
            [idBuf replaceObjectAtIndex:0 withObject:@"us"];
            break;
        case '2':
            [idBuf replaceObjectAtIndex:0 withObject:@"eu"];
            break;
        case '3':
            [idBuf replaceObjectAtIndex:0 withObject:@"kr"];
            break;
        case '6':
            [idBuf replaceObjectAtIndex:0 withObject:@"sg"];
            break;
        default:
            break;
    }

    uniqueServerId = [[idBuf objectAtIndex:2] stringByAppendingString:[idBuf lastObject]];

    [resPlayer setServer:[idBuf objectAtIndex:0]];
    [resPlayer setIdentifier:uniqueServerId];



return resPlayer;


}

编辑：我刚刚再次检查，idBuf[0] 和 idBuf[3] 包含相同的值，显示为 C 字符串是：

"@\xfffffffa\xfffffffb}\xffffffff\x7f"