Detect touch in scrollview - tutorial

[anuragphadke]

no difference. I have a NSLog statement at touchesShouldCancelInContentView, but that NSLog never gets printed suggesting that the method isn't getting accessed. Can you elaborate more on the handling of touches not within ScrollView but within content?

[dennisolly]

Originally Posted by slahteine

What result do you get if you return NO from touchesShouldCancelInContentView?

Also, you shouldn't be handling any touches in the ScrollView itself, only in the content views within it.

@slahteine

Man, you rule! They should call you a Programming Wizard. oh wait...

Seriously, thanks for those tips! I now have UIScrollView that scrolls like it should and can be swiped away (or whatever response you like) with a single swipe.

Dennis

[kum]

Great tutorial. However I still have some issues.

I enabled paging so that I could scroll through different views. The problem is that only the first view is able to detect touches and the others can't. Why is this?

[michael.liebwein]

Originally Posted by kum

Great tutorial. However I still have some issues.

I enabled paging so that I could scroll through different views. The problem is that only the first view is able to detect touches and the others can't. Why is this?

This might be the case, when you have not set the size of the scroll view's content view correctly. So if you have a scrollView and a contentView as it's child (containing your different views), you should be doing something along the lines:

CGRect contentFrame = contentView.frame;
contentFrame.size.width = newWidth; // set new width here
contentFrame.size.height = newHeight; // set new height here
contentView.frame = contentFrame;

scrollView.contentSize = contentView.frame.size;

[cvcs1]

Great Tutorial! Really helpful.

I have one question though, How do I check WHERE it is touched? I have this code in my "myImageView"

-(void) touchesBegan: (NSSet *) touches withEvent: (UIEvent *) event
{	
	UITouch *touch = [touches anyObject];
	CGPoint touchPoint = [touch locationInView:self];
	NSLog(@"Touch detected at: X = %d, Y = %d", touchPoint.x, touchPoint.y);
}

But that returns this in the log:

2011-03-11 07:05:56.969 Us![3428:207] Touch detected at: X = 0, Y = 1085492480
2011-03-11 07:05:57.322 Us![3428:207] Touch detected at: X = 0, Y = 1085492480
2011-03-11 07:05:57.529 Us![3428:207] Touch detected at: X = 0, Y = 1085492480

And that is DEFINITELY not where I touched it, and I moved quite a lot to try and get something else. Thanks!

EDIT: Nevermind... I was logging it incorrectly. :P

[Smith01]

Cool posts indeed.
Please carry on guys with more cool tutorials.

[Jasika8745]

A very good work done by you.