ios - 我从 NSString 的 'componentsSeparatedByString' 方法得到了奇怪的输出

Question

我想将 NSDictionary 数组存储到一个文件中。所以我写了一个函数来将 NSArray 转换为 NSString。但是我遇到了一个非常奇怪的问题。这是我的代码。

+ (NSArray *)arrayForString:(NSString*)dataString
{
    NSArray* stringArray = [dataString componentsSeparatedByString:ROW_SEPARATOR];
    NSLog(@"%@", stringArray);
    NSMutableArray* dictionaryArray = [[NSMutableArray alloc] initWithCapacity:0];
    for (int i = 0; i < [stringArray count]; i++)
    {
        NSString* string = [stringArray objectAtIndex:i];
        NSLog(@"%@", string);
        NSArray* subStrings = [string componentsSeparatedByString:COLUMN_SEPARATOR];
        NSDictionary* dic = [[NSDictionary alloc] initWithObjectsAndKeys:[subStrings objectAtIndex:0], PHOTO_NAME, [NSNumber numberWithUnsignedInt:[[subStrings objectAtIndex:1] unsignedIntValue]], PHOTO_SEQ_NO, nil];
        [dictionaryArray addObject:dic];
    }
    return dictionaryArray;
}

这是日志:

2012-05-05 23:57:35.113 SoundRecognizer[147:707] (
    "new Photo/0",
    "new Photo/1"
)
2012-05-05 23:57:35.118 SoundRecognizer[147:707] new Photo/0
2012-05-05 23:57:35.123 SoundRecognizer[147:707] -[__NSCFString unsignedIntValue]: unrecognized selector sent to instance 0x1d18c0

如何从下面的数组中获取@"-"？!

2012-05-05 23:57:35.113 SoundRecognizer[147:707] (
    "new Photo/0",
    "new Photo/1"
)

Answer 1

NSString 没有 unsignedIntValue 方法。请改用 intValue。但我不确定这一切的意义所在——无论如何，您都可以使用 writeToFile: atomically: 将字典数组直接写入文件(只要它们只包含属性列表类型)。