On Thu, 26 Feb 2009 08:49:57 -0600, I. Savant <idiotsavant2...@gmail.com> wrote:
- (IBAction)seek:(id)sender
{
// We have to figure out speed and direction
BOOL forward;
int factor;
// The sender (based on its tag) tells us this ...
int tag = [sender tag]; // or NSInteger tag = [sender tag];
switch (case)
{
case 1001: // seek back
forward = NO;
factor = 1;
break;
case 1002: // seek back FAST
forward = NO;
factor = 2;
break;
case 1003: // seek forward
forward = YES;
factor = 1;
break;
case 1004: // seek forward FAST
forward = YES;
factor = 2;
break;
default:
forward = YES;
factor = 1;
break;
}
// Now tell the media controller what to do
[mediaController seek:forward withFactor:factor];
// Maybe update the UI
[self updateUI];
// Maybe do some more complicated things with other arguments ...
}
Depending on your scenario, you might be able to encode the different cases
into bitfields. The above function then turns into something like this:
typedef union {
int tag;
struct {
unsigned forward:1;
unsigned factor:4;
} fields;
} MyCases;
- (IBAction)seek:(id)sender
{
MyCases cases;
cases.tag = [sender tag];
[mediaController seek:cases.fields.forward
withFactor:cases.fields.factor];
[self updateUI];
}
You have to write a small utility to figure out which tag value encodes
which field options, but that's a small price to pay. Alternatively, you
can encode bitfields manually:
#define FORWARD_FIELD_MASK 0x0010
#define FACTOR_FIELD_MASK 0x000F
And do the bit-shifting/masking yourself.
--- Peter
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