Drawing currency symbol
How to draw a currency symbol in a custom label using CGContextShowTextAtPoint method in draw rect开发者_如何学Go. Here the symbol is in string format.
Any help!! Thanks
You have to resort to C
style strings, since this is what CGContextShowTextAtPoint()
requires. In order to correctly handle the locale (the currency symbol changes with the locale) you must use setlocale()
, then you format your string using strfmon()
and finally you pass the string created with strfmon(
) to CGContextShowTextAtPoint()
.
Documentation is available as follows from the terminal:
man 3 setlocale
man 3 strfmon
EDIT/UPDATE: For your information, strfmon()
internally uses struct lconv
. The structure can be retrieved with the function localeconv()
. See man 3 localeconv
for a detailed description of the fields available in the structure.
for instance, try the following simple C program setting different locales
#include <stdio.h>
#include <locale.h>
#include <monetary.h>
int main(void)
{
char buf[BUFSIZ];
double val = 1234.567;
/* use your current locale */
setlocale(LC_ALL, "");
/* uncomment the next line and try this to use italian locale */
/* setlocale(LC_ALL, "it_IT"); */
strfmon(buf, sizeof buf, "You owe me %n (%i)\n", val, val);
fputs(buf, stdout);
return 0;
}
The following uses localeconv()
:
#include <stdio.h>
#include <limits.h>
#include <locale.h>
int main(void)
{
struct lconv l;
int i;
setlocale(LC_ALL, "");
l = *localeconv();
printf("decimal_point = [%s]\n", l.decimal_point);
printf("thousands_sep = [%s]\n", l.thousands_sep);
for (i = 0; l.grouping[i] != 0 && l.grouping[i] != CHAR_MAX; i++)
printf("grouping[%d] = [%d]\n", i, l.grouping[i]);
printf("int_curr_symbol = [%s]\n", l.int_curr_symbol);
printf("currency_symbol = [%s]\n", l.currency_symbol);
printf("mon_decimal_point = [%s]\n", l.mon_decimal_point);
printf("mon_thousands_sep = [%s]\n", l.mon_thousands_sep);
printf("positive_sign = [%s]\n", l.positive_sign);
printf("negative_sign = [%s]\n", l.negative_sign);
}
I don't really get what you're asking, checking the documentation, the method would look something like that:
CGContextRef ctx = UIGraphicsGetCurrentContext();
const char *string = "$";
CGContextShowTextAtPoint (ctx, 160, 240, string, 1);
Haven't tested it, but this should draw $ in the center of the screen.
BTW, why not use images?
~ Natanavra.
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