iphone sdk: finding the direction of scrolling in UIScrollView
- by Alex1987
I have a UIScrollView with only horizontal scrolling allowed, and I would like to know which direction (left, right) the user scrolls. What I did was to subclass the UIScrollView and override the touchesMoved method:
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
[super touchesMoved:touches withEvent:event];
UITouch *touch = [touches anyObject];
float now = [touch locationInView:self].x;
float before = [touch previousLocationInView:self].x;
NSLog(@"%f %f", before, now);
if (now > before){
right = NO;
NSLog(@"LEFT");
}
else{
right = YES;
NSLog(@"RIGHT");
}
}
But this method sometimes doesn't get called at all when I move. What do you think?
