objective-c - ios NSString字符串转换为16进制字符串，如何转换？

Answer 1

- (NSData *)hexToBytes:(NSString *)str
{
NSMutableData* data = [NSMutableData data];
int idx;
for (idx = 0; idx+2 <= str.length; idx+=2) {
    NSRange range = NSMakeRange(idx, 2);
    NSString* hexStr = [str substringWithRange:range];
    NSScanner* scanner = [NSScanner scannerWithString:hexStr];
    unsigned int intValue;
    [scanner scanHexInt:&intValue];
    [data appendBytes:&intValue length:1];
}
return data;
}
可以把@"3C2B89"转成<3c2b89>

Answer 2

转成char ，再把char 转成unsigned char (Byte )就行了

Answer 3

ios 的与JavaScript的思路也差不了多少？