NSString"预期':'之前'''令牌"错误

Question

我的方法旨在从输入字符串中提取游戏级别的信息.输入指定2D阵列播放区域的大小,以及2D阵列中的哪些点处存在的项目.

例如,"4,3.a,b,c.d,e,f.g,h,i,j,k,l"将包含4列和3行,看起来像这样(没有连字符):

一个--- --- d ---克Ĵ

B ---电Ë---高---ķ

Ç--- F --- I ---升

代码工作正常,直到最后一行,我得到错误:"预期':'之前'''令牌".

我一直试图解决这个问题,所以如果我错过了一些愚蠢的事情,我会很尴尬!任何帮助将非常感激.

-(void)readLevelDataFromString:(NSString*)inputString {
    //remove spaces from the input
    NSString *tempString = [inputString stringByReplacingOccurrencesOfString:@" " withString:@""];

    //make mutable
    NSMutableString *levelDataString = [NSMutableString stringWithString:tempString];

    //trim first 4 characters, which we don't need
    [levelDataString deleteCharactersInRange:NSMakeRange(0, 4)];

    //separate whole string into an array of strings, each of which contains information on the particular column
    NSArray *levelDataStringColumns = [levelDataString componentsSeparatedByString:@"."];

    NSAssert([levelDataStringColumns count] == numColumns, @"In the level data string, the number of columns specified did not match the number of X tiles present.");

    NSString *columnString = [[NSString alloc] initWithString:[[levelDataStringColumns] objectAtIndex:0]];
}

Answer 1

你有一套额外的[].你要:

NSString *columnString = [[NSString alloc] initWithString:[levelDataStringColumns objectAtIndex:0]];