iOS 超简单的进制转换

1. 十六进制转十进制

NSString*hex2 =@"A3";

QLog(@"%lu",strtoul(hex2.UTF8String,0,16));

2. 十进制转十六进制

NSString*hex = [NSStringstringWithFormat:@"%x",tmpid];

while(hex.length%2!=0){

    hex = [NSStringstringWithFormat:@"0%@",hex];

}

NSLog(@"%@",hex);