NSString/NSMutableString関連のメモ

NSString

    // 文字列の連結.
    NSString *str1 = @"文字列1";
    NSString *str2 = @"文字列2";
    NSString *str3 = [str1 stringByAppendingString:str2];
    NSLog(@"str1[%@] str2[%@] str3[%@]", str1, str2, str3);
    
    // 文字数の取得(lengthはメソッドだけどプロパティのように書ける).
    NSLog(@"str1[%d] str2[%d] str3[%d]", [str1 length], str2.length, str3.length);
    
    // 文字列の一部を取り出す.
    NSLog(@"%@", [str3 substringFromIndex:4]);
    NSLog(@"%@", [str3 substringToIndex:4]);
    NSLog(@"%@", [str3 substringWithRange:NSMakeRange(2, 4)]);
    
    // 文字列の検索.
    NSString *target = @"1";
    NSRange range = [str3 rangeOfString:target];
    if (range.location == NSNotFound) {
        NSLog(@"%@は見つかりませんでした", target);
    }
    else {
        NSLog(@"%@は%d文字目にありました", target, range.location+1);
    }
    
    // 文字列の比較.
    if ([str1 isEqualToString:str2]) {
//    if ([[str1 lowercaseString] isEqualToString:[str2 lowercaseString]]) {
        NSLog(@"同じです");
    }
    else {
        NSLog(@"違います");
    }
    
    // 文字列の置換.
    range = NSMakeRange(2, 4);
    NSString *rep = [str3 stringByReplacingCharactersInRange:range withString:@"あいうえお"];
    NSLog(@"[%@]=>[%@]", str3, rep);
    rep = [str3 stringByReplacingOccurrencesOfString:@"列" withString:@"数"];
    NSLog(@"[%@]=>[%@]", str3, rep);
    
    // 文字列を数値やBOOL値に変換.
    NSString *strNum = @"123456789";
    NSLog(@"%d", [strNum integerValue]);
    NSString *y = @"y";
    NSString *T = @"T";
    NSLog(@"y[%@] strNum[%@] T[%@]", ([y boolValue]?@"YES":@"NO"), ([strNum boolValue]?@"YES":@"NO"), ([T boolValue]?@"YES":@"NO"));
    
    // 編集可能な文字列.
    NSMutableString *mstr = [NSMutableString stringWithCapacity:8];
    NSLog(@"%@ len[%d]", mstr, mstr.length);
    [mstr appendString:@"12345"];
    NSLog(@"%@ len[%d]", mstr, mstr.length);
    [mstr appendString:@"67890"];
    NSLog(@"%@ len[%d]", mstr, mstr.length);
    mstr = [NSMutableString string];
    NSLog(@"%@ len[%d]", mstr, mstr.length);
    [mstr setString:@"ABCDEFGHIJKLMNOPQRSTUVWXYZ"];
    NSLog(@"%@ len[%d]", mstr, mstr.length);
    [mstr deleteCharactersInRange:NSMakeRange(5, 3)];
    NSLog(@"%@ len[%d]", mstr, mstr.length);
    [mstr insertString:@"fgh" atIndex:5];
    NSLog(@"%@ len[%d]", mstr, mstr.length);