我正在字符串<0000000a>中获取十六进制值吗？ 如何在Objective-C中将其转换为整数？

Question

First i have to convert Hex but this <> generates an exception when i am trying to convert it to integer

NSString *steps =characteristic.value;
int value2= [steps intValue];

First i have to removce <>, then convert this hexadecimal string into integer value.

Answer 1

NSString *strVal = [[NSString alloc] initWithData:characteristic.value encoding:NSUTF8StringEncoding]; int intValue = strVal.intValue;

Answer 2

You have to prefix your string with 0x :

NSString *orig = @"000000ae";
NSString *str = [NSString stringWithFormat:@"0x%@" , orig];

to be able to use NSScanner :

unsigned int outVal;
NSScanner* scanner = [NSScanner scannerWithString:str];
[scanner scanHexInt:&outVal];

outVal holds your result now.