this is what i have so far, but i have no idea how to write the
touchesEnded method so that the appropriate label will clear. so if 3
fingers are touching the screen and displaying their different
coordinates, if the 2nd finger that was pressed ends its touch, the
2nd label will clear ("Touch 2: {0, 0}") while the 1st and 3rd
continue to track. clearly i'm lost, i apologize.
- (void)viewDidLoad
{
labelsArray = [[NSArray alloc] initWithObjects:touchLabe1,
touchLabe2, touchLabe3, nil];
touchesArray = [[NSMutableArray alloc] initWithCapacity:3];
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
for (UITouch *touch in touches)
[touchesArray addObject:touch];
for (NSUInteger i = 0; i < 3; i++)
{
UILabel *aLabel = [labelsArray objectAtIndex:i];
if (i < [touchesArray count])
{
UITouch *touch = [touchesArray objectAtIndex:i];
NSString *point = NSStringFromCGPoint([touch
locationInView:self.view]);
aLabel.text = [NSString
stringWithFormat:@"Title %i:\n%@", i+1, point];
}
}
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
for (NSUInteger i = 0; i < 3; i++)
{
UILabel *aLabel = [labelsArray objectAtIndex:i];
if (i < [touchesArray count])
{
UITouch *touch = [touchesArray objectAtIndex:i];
NSString *point = NSStringFromCGPoint([touch
locationInView:self.view]);
aLabel.text = [NSString
stringWithFormat:@"Title %i:\n%@", i+1, point];
}
}
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
//??
}
On Tue, Dec 8, 2009 at 11:01 AM, mmalc Crawford <mmalc_li...@me.com> wrote:
>
> On Dec 8, 2009, at 3:49 am, Chunk 1978 wrote:
>
>> i meant that i find it complicated compared to basic single touches or
>> gestures.
>>
> It's not clear what's complicated.
>
> You typically want to know when touches began, moved, and ended, and there
> are methods to inform you when each of these things happen (and another to
> let you know that they've been interrupted).
>
> This is a multi-touch system, so just because one touch began it doesn't mean
> all did. So in some cases at least (including, it seems, yours) you need a
> means to get information about other touches. The methods therefore all tell
> you: "Here are the touches that have just entered the phase you're interested
> in in this method, and here's a data structure (the UIEvent object) that
> gives you a way to get information about all the current touches".
>
> It's difficult to see how this could be simpler. About the only
> simplification could be that the methods could take a single parameter...
> there are a couple of scenarios for this. The methods could just pass the
> UIEvent object -- but then you'd have to iterate through its touches to find
> the ones that are in the phase you're interested in. Or you could have two
> (or three) methods per phase, e.g. touchesBegan: and touchesBeganInEvent:
> (and maybe again touchesBegan:withEvent:), but then you're making things more
> complicated again with multiple override points.
>
> mmalc
>
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