16进制转化成二进制

在程序中需要把16进制的数字转化成二进制的数据进行输出，写了一个不是很好的方法，记录下，以备后用。 

 

//在.h 头文件中定义16进制与二进制的转化数组

NSMutableDictionary * imgDic;

//16进制转化成二进制的方法

-(NSString *)getBinaryByhex:(NSString *)hex

{

NSMutableString *binaryString=[[NSMutableString alloc] init];

for (int i=0; i<[hex length]; i++) {

NSRange rage;

rage.length = 1;

rage.location = i;

NSString *key = [hex substringWithRange:rage];

//NSLog(@"%@",[NSString stringWithFormat:@"%@",[hexDic objectForKey:key]]);

binaryString = [NSString stringWithFormat:@"%@%@",binaryString,[NSString stringWithFormat:@"%@",[hexDic objectForKey:key]]];

}

//NSLog(@"转化后的二进制为:%@",binaryString);

return binaryString;

}

//在.m 文件的初始化如viewdidLoad 方法中初始化 转化字典

imgDic = [[NSMutableDictionary alloc] init];

[imgDic retain];

    

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"];

//在需要的地方调用16进制转化成二进制的方法

NSString *hexString = [self getBinaryByhex:@"2AF5"];//获取出来的hexString 即为需要的16进制数据2AF5 转化成二进制后的数据