如何从ios Objective-c中未格式化的字符串中获取值？

编辑答案：

好的 - 所以你想要每一行的“最后一句话”。

但是 ---- 我们假设您想忽略最后没有“值”的行。所以：

• 将字符串拆分为“行”数组
• 创建要忽略的行列表
• 循环遍历行数组
• 如果该行在忽略列表中，则忽略它
• 否则，获取最后一个单词并将其添加到我们的“last words”数组中

所以...

NSString *searchedString = @"KANE458 SW19392 V1.13\n\nSERIAL No.    12345\n\nLOG No.               0002\n\nDATE          23/02/18  \nTIME          17:43:16\n\n------------------------\nNEXT CAL      11/12/18\n------------------------\n\nCOMMISSION TEST\n------------------------\n\nANALYSER ZERO\n-------------\nCO2             %  -0.00\n\nCO            ppm      0\n\nFLUE INTEGRITY\n--------------\n\nCO2             %   0.00\n\nMAX GAS FLOW\n------------\nCO2             %  -0.00\nCO            ppm      0\nCO/CO2            0.0000\n\nMIN GAS FLOW\n------------\nCO2             %  -0.00\n\nCO            ppm      0\n\nCO/CO2            0.0000\n\nFLOW & RETURN\n-------------\nT1               (null)C  -N\F-\n\nT2             (null)C  -N\F-\n\nDELTA          (null)C  -N\F-\n";

// lines to ignore, because they have no "values"
NSString *ignoreLines = @"COMMISSION TEST,ANALYSER ZERO,FLUE INTEGRITY,MAX GAS FLOW,MIN GAS FLOW,FLOW & RETURN";

// initialize an array for the last "word" from each line
NSMutableArray *arrayOfLastWords = [NSMutableArray array];

// split string into an array of "lines"
NSArray *arrayOfLines = [searchedString componentsSeparatedByString:@"\n"];

// for each "line"
for (NSString *s in arrayOfLines) {

    // see if this line is listed as one of the lines to ignore
    NSRange ignoreRange = [ignoreLines rangeOfString:s];

    // if not found, then we want to get the last "word"
    if (ignoreRange.location == NSNotFound) {

        // find last space character
        NSRange range = [s rangeOfString:@" " options:NSBackwardsSearch];

        // if the line has a space
        if (range.location != NSNotFound) {

            // gett the last "word" - everything after the last space
            NSString *result = [s substringFromIndex:range.location+1];

            // append it to our array of last words
            [arrayOfLastWords addObject:result];

        }
    }

}

NSLog(@"\n%@", arrayOfLastWords);

给出一个结果数组：

(
    "V1.13",
    12345,
    0002,
    "",
    "17:43:16",
    "11/12/18",
    "-0.00",
    0,
    "0.00",
    "-0.00",
    0,
    "0.0000",
    "-0.00",
    0,
    "0.0000",
    "-NF-",
    "-NF-",
    "-NF-"
)

如果您不想要第一行中的“V1.13”，只需跳过处理第一行。

如果您不知道字符串将使用 newLine 分隔符返回，或者如果您不知道将返回哪些字符串需要忽略，那么您需要编写一些额外的代码来将字符串拆分为各种分隔符，并提出构成“价值线”的标准。

原答案：

你可以用“蛮力”方法来做到这一点：

• 将字符串拆分为“行”数组
• 循环线
• 检查每行中的第一个“单词”
• 如果它匹配“CO2”或“T1”，则获取该行的其余部分（跳过空格）并将其添加到数组中

或者，您可以使用正则表达式。这是部分方法：

NSString *searchedString = @"KANE458 SW19392 V1.13\n\nSERIAL No.    12345\n\nLOG No.               0002\n\nDATE          23/02/18  \nTIME          17:43:16\n\n------------------------\nNEXT CAL      11/12/18\n------------------------\n\nCOMMISSION TEST\n------------------------\n\nANALYSER ZERO\n-------------\nCO2             %  -0.00\n\nCO            ppm      0\n\nFLUE INTEGRITY\n--------------\n\nCO2             %   0.00\n\nMAX GAS FLOW\n------------\nCO2             %  -0.00\nCO            ppm      0\nCO/CO2            0.0000\n\nMIN GAS FLOW\n------------\nCO2             %  -0.00\n\nCO            ppm      0\n\nCO/CO2            0.0000\n\nFLOW & RETURN\n-------------\nT1               (null)C  -N\F-\n\nT2             (null)C  -N\F-\n\nDELTA          (null)C  -N\F-\n";

NSError  *error = nil;  
NSRange   searchedRange = NSMakeRange(0, [searchedString length]);

// search for "CO2" at the start of a line, and capture everything to the end of the line
NSString *pattern = @"\\nCO2\\s*([^\\n\\r]*)";

NSRegularExpression* regex = [NSRegularExpression regularExpressionWithPattern: pattern options:0 error:&error];
NSArray* matches = [regex matchesInString:searchedString options:0 range: searchedRange];

// for each found match, skip spaces and save the rest of the line
for (NSTextCheckingResult* match in matches) {
    NSString* matchText = [searchedString substringWithRange:[match range]];
    NSRange group1 = [match rangeAtIndex:1];
    [arrayOfCO2 addObject:[searchedString substringWithRange:group1]];
}

// search for "T1" at the start of a line, and capture everything to the end of the line
pattern = @"\\nT1\\s*([^\\n\\r]*)";

regex = [NSRegularExpression regularExpressionWithPattern: pattern options:0 error:&error];
matches = [regex matchesInString:searchedString options:0 range: searchedRange];

// for each found match, skip spaces and save the rest of the line
for (NSTextCheckingResult* match in matches) {
    NSString* matchText = [searchedString substringWithRange:[match range]];
    NSRange group1 = [match rangeAtIndex:1];
    [arrayOfT1 addObject:[searchedString substringWithRange:group1]];
}

NSLog(@"");

NSLog(@"CO2:");

NSLog(@"%@", arrayOfCO2);

NSLog(@"");

NSLog(@"T1:");

NSLog(@"%@", arrayOfT1);

这是您发布的示例字符串的结果：

CO2:
(
    "%  -0.00",
    "%   0.00",
    "%  -0.00",
    "%  -0.00"
)

T1:
(
    "(null)C  -NF-"
)