NSLog allows you to print messanges and values to the
'Console" (the Run Log). It is similar to:
printf()
It takes a format string and a comma-separated list
of variables to be substituted into the format string. When displaying
the string, NSLog prefixes the generated string with the name of the
application and a time stamp.
Here is a list of all the tokens recognized by NSLog:
| Symbol |
Displays |
| %@ |
id |
| %d, %D, %i |
long |
| %u, %U |
unsigned long |
| %hi |
short |
| %hu |
unsigned short |
| %qi |
long long |
| %qu |
unsigned long long |
| %x, %X |
unsigned long printed as hexidecimal |
| %o, %O |
unsigned long printed as octal |
| %f, %e, %E, %g, %G |
double |
| %c |
unsigned char as ASCII character |
| %s |
char * (a null-terminated C string of ASCII characters) |
| %S |
unichar * (a null-terminated C string of Unicode characters) |
| %p |
void * (an address printed in hexidecimal with a leading 0x |
| % % |
A % character |
| |
|
| @"Any text you want" |
prints some message you define |
Examples:
Printing the value of a slider using NSLog:
- (IBAction)setMetTempo:(id)sender
{
myValue = [sender intValue];
myOtherValue = myValue*2;
if (myOtherValue< 20) {
myOtherValue = 20;
}
NSLog(@"My message, myOtherValue = %d",
myOtherValue);
[myField setIntValue:myOtherValue];
}
