ch20.txt

chapter: Touch Screens
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- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch* touch = [[event touchesForView:self] anyObject];
    firstTouch = [touch locationInView:self];
    self.status = YES;
    [self trigger];
}
    
    
====================================
- (void)storeTouchPoints:(NSSet *)touches{
    if ([touches count] > 0) {
        for (UITouch *touch in touches) {
            CGPoint *point = (CGPoint                 
            *)CFDictionaryGetValue(touchBeginPoints, touch);
            if (point == NULL) {
                point = (CGPoint *)malloc(sizeof(CGPoint));
                CFDictionarySetValue(touchBeginPoints, touch, point);
            }
            *point = [touch locationInView:view.superview];
        }
    }
    
    
==================