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swift 2.1 基本：文字列と文字
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| //## 文字列 ##### | |
| //## 長さ | |
| "abcde".characters.count //5 | |
| "アイウエオ".characters.count //5 |
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| //## 文字列の結合 | |
| let l結合文字列 = "aa" + "bb" + "cc" //"aabbcc" | |
| //## 配列に分割 | |
| //(--- Swift3 ---) update 16/06/15 | |
| //let l文字列配列1 = "aa bb cc".componentsSeparatedByString(" ") //["aa", "bb", "cc"] | |
| let l文字列配列1 = "aa bb cc".components(separatedBy: " ") //["aa", "bb", "cc"] | |
| //## 配列を結合して文字列にする | |
| //# メソッドを使用 | |
| //(--- Swift3 ---) update 16/06/15 | |
| //let l結合文字列2 = ["aa", "bb", "cc"].joinWithSeparator(" ") //"aa bb cc" | |
| let l結合文字列2 = ["aa", "bb", "cc"].joined(separator: " ") //"aa bb cc" | |
| //# クロージャによる方法 | |
| let l結合文字列3 = ["aa","bb","cc"].reduce("") { | |
| // x が "" の時は xi を、それ以外は x + xi を次の x として返す | |
| if $0 == "" { | |
| return $1 | |
| } else { | |
| return $0 + $1 | |
| } | |
| } | |
| print(l結合文字列3) //"aabbcc" | |
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| //## 文字列の置換 | |
| //(--- Swift3 ---) update 16/06/15 | |
| //let l置換文字列1 = "aa bb cc".stringByReplacingOccurrencesOfString( | |
| // "bb", withString: "BB") //"aa BB cc" | |
| let l置換文字列1 = "aa bb cc".replacingOccurrences(of: "bb", with: "BB") //"aa BB cc" | |
| //# 正規表現 | |
| //(--- Swift3 ---) update 16/06/15 | |
| //let l置換文字列2 = "abcde[2000]fg".stringByReplacingOccurrencesOfString( | |
| // "\\[\\d{4}\\]", withString: "--", | |
| // options:NSStringCompareOptions.RegularExpressionSearch, | |
| // range: nil) //"abcde--fg" | |
| let l置換文字列2 = "abcde[2000]fg".replacingOccurrences( | |
| of: "\\[\\d{4}\\]", with: "--", | |
| options:NSString.CompareOptions.regularExpressionSearch, | |
| range: nil) //"abcde--fg" | |
| //# 範囲指定 | |
| var vStr = "abcde" | |
| //(--- Swift3 ---) update 16/06/15 | |
| //vStr.replaceRange(vStr.startIndex.advancedBy(1)..<vStr.startIndex.advancedBy(4), with: "xyz") //axyze | |
| let idx1 = vStr.index(vStr.startIndex, offsetBy: 1) | |
| let idx4 = vStr.index(vStr.startIndex, offsetBy: 4) | |
| vStr.replaceSubrange(idx1..<idx4, with: "xyz") //axyze |
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| //## 文字列の削除 | |
| //(--- Swift3 ---) update 16/06/15 | |
| //vStr.removeRange(vStr.startIndex.advancedBy(1)..<vStr.startIndex.advancedBy(3)) //aze | |
| let idx3 = vStr.index(vStr.startIndex, offsetBy: 3) | |
| vStr.removeSubrange(idx1..<idx3) //aze |
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| //## 部分文字列 | |
| //(--- Swift3 ---) update 16/06/15 | |
| //let l部分3から最後 = "abcdefg".substringFromIndex(3) //"defg" | |
| //(--- Swift3 beta6 ---) update 16/08/19 | |
| //let l部分3から最後 = "abcdefg".substring(from: 3) //"defg" | |
| let index3 = "abcdefg".index("abcdefg".startIndex, offsetBy: 3) | |
| let l部分3から最後 = "abcdefg".substring(from: index3) //"defg" | |
| //(--- Swift3 ---) update 16/06/15 | |
| //let l部分先頭から3 = "abcdefg".substringToInde(3) //"abc" | |
| //(--- Swift3 beta6 ---) update 16/08/19 | |
| //let l部分先頭から3 = "abcdefg".substring(to: 3) //"abc" | |
| let l部分先頭から3 = "abcdefg".substring(to: index3) //"abc" | |
| //(--- Swift3 ---) update 16/06/15 | |
| //let l部分3から5 = "abcdefg".substringWithRange(NSRange(location: 3, length: 2)) //"de" | |
| //(--- Swift3 beta6 ---) update 16/08/19 | |
| //let l部分3から5 = "abcdefg".substring(with: NSRange(location: 3, length: 2)) //"de" | |
| let index5 = "abcdefg".index("abcdefg".startIndex, offsetBy: 5) | |
| let l部分3から5 = "abcdefg".substring(with: index3..<index5) //"de" |
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| //## トリミング | |
| //(--- Swift3 ---) update 16/06/15 | |
| //let l先頭と末尾の空白を除去 = " abcdefg ".stringByTrimmingCharactersInSet( | |
| // NSCharacterSet.whitespaceCharacterSet()) //"abcdefg" | |
| let l先頭と末尾の空白を除去 = " abcdefg ".trimmingCharacters( | |
| in: NSCharacterSet.whitespaces()) //"abcdefg" |
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| //## サブスクリプト | |
| let lStr = "abcdefg" | |
| let l先頭 = lStr[lStr.startIndex] //a | |
| //(--- Swift3 ---) update 16/06/15 | |
| let l先頭の次 = lStr[lStr.index(lStr.startIndex, offsetBy: 1)] //b | |
| //(--- Swift3 ---) update 16/06/15 | |
| //let l3文字目 = lStr[lStr.startIndex.advancedBy(2)] //c | |
| let l3文字目 = lStr[lStr.index(vStr.startIndex, offsetBy: 2)] //c | |
| let l先頭から最後 = lStr[lStr.startIndex ..< lStr.endIndex] //abcdefg |
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| //## URL の検査 | |
| let l検査文字列 = "この文から URL http://www.google.com を取り出す" | |
| //(--- Swift3 ---) update 16/06/15 | |
| //let l検査 = try! NSDataDetector(types: NSTextCheckingType.Link.rawValue) | |
| //(--- Swift3 beta6 ---) update 16/08/19 | |
| //let l検査 = try! NSDataDetector(types: TextCheckingResult.CheckingType.link.rawValue) | |
| let l検査 = try! NSDataDetector(types: NSTextCheckingResult.CheckingType.link.rawValue) | |
| //(--- Swift3 ---) update 16/06/15 | |
| //let matches = l検査.matchesInString(l検査文字列, options: [], range: NSMakeRange(0, l検査文字列.characters.count)) | |
| let matches = l検査.matches(in: l検査文字列, options: [], range: NSMakeRange(0, l検査文字列.characters.count)) | |
| for match in matches { | |
| //(--- Swift3 ---) update 16/06/15 | |
| //let url = (l検査文字列 as NSString).substringWithRange(match.range) | |
| let url = (l検査文字列 as NSString).substring(with: match.range) | |
| print(url) | |
| } | |
| //結果： "http://www.google.com" |
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| //## 書式設定 | |
| //# 日付 | |
| //(--- Swift3 ---) update 16/06/15 | |
| //let df:NSDateFormatter = NSDateFormatter() | |
| let df:DateFormatter = DateFormatter() | |
| df.dateFormat = "yyyy年MM月dd日" | |
| //(--- Swift3 ---) update 16/06/15 | |
| //print("日付：\(df.stringFromDate(NSDate()))") | |
| print("日付：\(df.string(from: NSDate() as Date))") | |
| //結果："日付：2016年03月01日" (実行した日付による） | |
| //# 数値 | |
| let num1 = String(format: "%1.2f", 55.3) | |
| let num2 = String(format: "%1.2f", 55.345) | |
| let num3 = String(format: "%4d", 55) | |
| let num4 = String(format: "%04d", 55) | |
| print("f1:\(num1) f2:\(num2) i1:\(num3) i2:\(num4)") | |
| //結果："f1:55.30 f2:55.34 i1: 55 i2:0055" |
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