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iOS 二进制、十进制、十六进制之间的转化
开发过程中不免会使用到进制之间转化
首先是十进制转换为二进制
/**十进制转换为二进制@param decimal 十进制数@return 二进制数*/
+ (NSString *)getBinaryByDecimal:(NSInteger)decimal {NSString *binary = @"";while (decimal) {binary = [[NSString stringWithFormat:@"%ld", (long)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;
}
再下来就是十进制转换十六进制
/**十进制转换十六进制@param decimal 十进制数@return 十六进制数*/
+ (NSString *)getHexByDecimal:(NSInteger)decimal {NSString *hex =@"";NSString *letter;NSInteger number;for (int i = 0; i<9; i++) {number = decimal % 16;decimal = decimal / 16;switch (number) {case 10:letter =@"A"; break;case 11:letter =@"B"; break;case 12:letter =@"C"; break;case 13:letter =@"D"; break;case 14:letter =@"E"; break;case 15:letter =@"F"; break;default:letter = [NSString stringWithFormat:@"%ld", number];}hex = [letter stringByAppendingString:hex];if (decimal == 0) {break;}}return hex;
}
再下来是二进制转换成十六进制
/**二进制转换成十六进制@param binary 二进制数@return 十六进制数*/
+ (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;
}
下面是十六进制转换为二进制
/**十六进制转换为二进制@param hex 十六进制数@return 二进制数*/
+ (NSString *)getBinaryByHex:(NSString *)hex {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<[hex length]; i++) {NSString *key = [hex substringWithRange:NSMakeRange(i, 1)];NSString *value = [hexDic objectForKey:key.uppercaseString];if (value) {binary = [binary stringByAppendingString:value];}}return binary;
}
最后是二进制转换为十进制
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