Yuka(Osaka School)'s Calculator program that can trim appropriate strings.

DMCheckString

#pragma mark - Check String (まっすーアルゴリズム)

- (NSString *)checkString:(NSString *)string
{
    NSRange searchResult = [string rangeOfString:@"="];
    NSString *numberString;
    
    NSLog(@"string is %@", string);
    
    if(searchResult.location == NSNotFound){
        // みつからない場合の処理
        NSLog(@"NOT FOUND");
        return string;
    }else{
        // みつかった場合の処理
        NSLog(@"FIND");
        
        //スペースをトリミングする(うまくいってないかもw)
        NSString *stringWithTrimmed = [string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
        NSLog(@"stringWithTrimmed is %@", stringWithTrimmed);
        
        //文字数を数える
        int numberOfCharacter = [stringWithTrimmed length];
        NSLog(@"numberOfCharacter is %d", numberOfCharacter);
        
        //「=」の位置を計算して、=よりあとの文字を切り出す。
        numberString = [stringWithTrimmed substringWithRange:NSMakeRange(searchResult.location, numberOfCharacter - searchResult.location)];
        
        NSLog(@"numberString is %@", numberString);
        
        return numberString;
    }
    return nil;
}