NSScanner中的额外字符（objective-C）

我在NSScanner中解析字符串时遇到一个小问题。我读过其他关于这方面的文章，但无法解决这个愚蠢的问题

我有这样一个字符串“第一个单词不等于第二个单词”

我的代码是：

NSString *seperator = @" =";
NSCharacterSet *newLineCharacterSet = [NSCharacterSet newlineCharacterSet];


[scanner scanUpToString:seperator intoString:&firstString];
[scanner scanString:seperator intoString:NULL];
scanPosition = [scanner scanLocation];
//scanPosition = scanPosition +2;

secondString = [[scanner string] substringFromIndex:scanPosition];

[scanner scanUpToCharactersFromSet:newLineCharacterSet intoString:&secondString];

NSLog(@"firstString: %@", firstString);
NSLog(@"secondString: %@", secondString);

问题是我将分隔符作为第二个字符串的一部分

firstString: "the first word is not"
secondString is "= to the second word"      

---

所以你想分开这些字符串？您可以使用NSString的

组件通过string

方法分离

NSArray* foo = [@"the first word is not = to the second word" componentsSeparatedByString: @"="];

NSString *firstString = foo[0]; //the first word is not 
NSString *secondString = foo[1]; // to the second word

---

如果要使用扫描仪，必须将扫描仪的位置移过分隔符，正如您在代码中注释的那样。

以下是我在Xcode中运行的内容：

NSString *seperator = @" =";
NSCharacterSet *newLineCharacterSet = [NSCharacterSet newlineCharacterSet];

NSScanner *scanner = [NSScanner localizedScannerWithString:@"the first word is not = to the second word"];

//NSString *firstString; //= @"the first word is not = to the second word";
NSString *secondString;
int scanPosition;
NSString *foundSubs;

[scanner scanUpToString:seperator intoString:&foundSubs];
//[scanner scanString:seperator intoString:NULL];
scanPosition = [scanner scanLocation];
//scanPosition = scanPosition +2;

secondString = [[scanner string] substringFromIndex:scanPosition+[seperator length]];

//[scanner scanUpToCharactersFromSet:newLineCharacterSet intoString:&secondString];

NSLog(@"firstString: %@", foundSubs);
NSLog(@"secondString: %@", secondString);

得到：

2014-08-11 11:56:10.495 tester[3068:60b] firstString: the first word is not
2014-08-11 11:56:10.496 tester[3068:60b] secondString:  to the second word

---

为了子孙后代，请检查“separator”的拼写

非常感谢，欢迎光临。非常感谢您的回答。我希望这个世界会改变separator的拼写，但我想不会的……谢谢！很高兴这有助于Hank的回答，但我想继续使用扫描仪，因为我想做更多的过滤。。。所以+1，但我给了第一次海报的结尾。。。