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下面罗列了二进制、十进制、十六进制之间相互转换的方法，有时候可能会用的到，需要的朋友可以收藏一下。
1. 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", 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. 十进制转换为十六进制
/**
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;
}
3. 二进制转换为十六进制
/**
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;
}
4. 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;
}
5. 二进制转换为十进制
/**
二进制转换为十进制
@param binary 二进制数
@return 十进制数
*/
+ (NSInteger)getDecimalByBinary:(NSString *)binary {
NSInteger decimal = 0;
for (int i=0; i<binary.length; i++) {
NSString *number = [binary substringWithRange:NSMakeRange(binary.length - i - 1, 1)];
if ([number isEqualToString:@"1"]) {
decimal += pow(2, i);
}
}
return decimal;
}
大概就这么多了，有其他需求可以补充，需要十六进制转换为十进制的话，就按上面方法将十六进制转换为二进制后再转换为十进制就行了，有需要的朋友就收藏一下吧！
