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NSStringの前後の空白をトリミングする際、全角スペースはそのままにしとく

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文字列の前後に存在する空白文字・改行コードを取り除くには、NSCharacterSetのwhitespaceAndNewlineCharacterSetが便利。

NSCharacterSet *whitespaceAndNewLineSet = [NSCharacterSet whitespaceAndNewlineCharacterSet];

NSString *originalString = @" 文字列 "; // 全角空白を前後に持つ文字列
NSString *trimedString = [originalString stringByTrimmingCharactersInSet:whitespaceAndNewLineSet]; // "文字列"になる

このcharacterSetには全角スペースも含まれるが、Mutableにすれば除外する文字を指定することもできる。

NSMutableCharacterSet *whitespaceAndNewLineSet = [NSMutableCharacterSet whitespaceAndNewlineCharacterSet];
[whitespaceAndNewLineSet removeCharactersInString:@" "];

NSString *originalString = @" 文字列 ";
NSString *trimedString = [originalString stringByTrimmingCharactersInSet:whitespaceAndNewLineSet]; // " 文字列 "のまま

とても単純だが、なかなか情報が見つけられなかった。

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