iOS開發進位轉換

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1、十進位轉換為二進位

/**十進位轉換為二進位@param decimal 十進位數@return 位元*/+ (NSString *)getBinaryByDecimal:(NSInteger)decimal {　　NSString *binary = @"";　　while (decimal) {　　　　binary = [[NSString stringWithFormat:@"%ld", decimal % 2] stringByAppendingString:binary];　　　　if (decimal / 2 < 1) {　　　　　　break;　　　　}　　　　decimal = decimal / 2 ;　　　　}　　if (binary.length % 4 != 0) {　　　　NSMutableString *mStr = [[NSMutableString alloc]init];　　　　for (int i = 0; i < 4 - binary.length % 4; i++) {　　　　　　[mStr appendString:@"0"];　　　　}　　　　binary = [mStr stringByAppendingString:binary];　　}　　return binary;}

2、十進位轉換為十六進位

/**將十進位轉化為十六進位@param decimal 10進位 int類型@return 16進位*/+ (NSString*)changDecimalToHex:(NSInteger)decimal {　　NSString* intDecimalStr = [[NSString alloc] initWithFormat:@"%1lx", (long)decimal];　　NSString* hexString = [NSString stringWithFormat:@"%@", intDecimalStr];　　if (hexString.length == 5) {　　　　return [[NSString stringWithFormat:@"0%@", hexString] uppercaseString];　　} else {　　　　return [hexString uppercaseString];　　}}

3、 二進位轉換為十六進位

/** 二進位轉換成十六進位    @param binary 位元 @return 十六進位數 */+ (NSString *)getHexByBinary:(NSString *)binary {        NSMutableDictionary *binaryDic = [[NSMutableDictionary alloc] initWithCapacity:16];    [binaryDic setObject:@"0" forKey:@"0000"];    [binaryDic setObject:@"1" forKey:@"0001"];    [binaryDic setObject:@"2" forKey:@"0010"];    [binaryDic setObject:@"3" forKey:@"0011"];    [binaryDic setObject:@"4" forKey:@"0100"];    [binaryDic setObject:@"5" forKey:@"0101"];    [binaryDic setObject:@"6" forKey:@"0110"];    [binaryDic setObject:@"7" forKey:@"0111"];    [binaryDic setObject:@"8" forKey:@"1000"];    [binaryDic setObject:@"9" forKey:@"1001"];    [binaryDic setObject:@"A" forKey:@"1010"];    [binaryDic setObject:@"B" forKey:@"1011"];    [binaryDic setObject:@"C" forKey:@"1100"];    [binaryDic setObject:@"D" forKey:@"1101"];    [binaryDic setObject:@"E" forKey:@"1110"];    [binaryDic setObject:@"F" forKey:@"1111"];        if (binary.length % 4 != 0) {                NSMutableString *mStr = [[NSMutableString alloc]init];;        for (int i = 0; i < 4 - binary.length % 4; i++) {                        [mStr appendString:@"0"];        }        binary = [mStr stringByAppendingString:binary];    }    NSString *hex = @"";    for (int i=0; i<binary.length; i+=4) {                NSString *key = [binary substringWithRange:NSMakeRange(i, 4)];        NSString *value = [binaryDic objectForKey:key];        if (value) {                        hex = [hex stringByAppendingString:value];        }    }    return hex;}

4、十六進位轉二進位

/** 十六進位轉換為二進位  @param hexString 十六進位數 @return 位元 */+ (NSString *)getBinaryByHexString:(NSString *)hexString {    NSMutableDictionary *hexDic = [[NSMutableDictionary alloc] initWithCapacity:16];    [hexDic setObject:@"0000" forKey:@"0"];    [hexDic setObject:@"0001" forKey:@"1"];    [hexDic setObject:@"0010" forKey:@"2"];    [hexDic setObject:@"0011" forKey:@"3"];    [hexDic setObject:@"0100" forKey:@"4"];    [hexDic setObject:@"0101" forKey:@"5"];    [hexDic setObject:@"0110" forKey:@"6"];    [hexDic setObject:@"0111" forKey:@"7"];    [hexDic setObject:@"1000" forKey:@"8"];    [hexDic setObject:@"1001" forKey:@"9"];    [hexDic setObject:@"1010" forKey:@"A"];    [hexDic setObject:@"1011" forKey:@"B"];    [hexDic setObject:@"1100" forKey:@"C"];    [hexDic setObject:@"1101" forKey:@"D"];    [hexDic setObject:@"1110" forKey:@"E"];    [hexDic setObject:@"1111" forKey:@"F"];        NSString *binary = @"";    for (int i = 0; i < [hexString length]; i++) {                NSString *key = [hexString substringWithRange:NSMakeRange(i, 1)];        NSString *value = [hexDic objectForKey:key.uppercaseString];        if (value) {                        binary = [binary stringByAppendingString:value];        }    }    return binary;}

5、十六進位轉十進位

/** 將十六進位轉化為十進位  @param hexString 16進位 nsstring類型 @return 10進位 */+ (NSInteger)changHexToDecimal:(NSString*)hexString {    NSString* temp10 = [NSString stringWithFormat:@"%lu", strtoul([hexString UTF8String], 0, 16)];    int cycleNumber = [temp10 intValue];    return cycleNumber;}

iOS開發進位轉換