How to know which view the user touches on screen - ios

Question

If there is a uiscrollview and and multiple sub view on the uiscrollview. how to know where the user touches i.e on specific view or scrollview(blank space)

Answer 1

Use this approach:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
NSLog(#"View touched: %#", touch.view);
}
This method is called every time your finger touches the screen, and the touch knows which view it touched.
Edit: It won't work on a UIScrollView because the scroll view gets the touch itself, check this:
touchesBegan method not called when scrolling in UIScrollView
How to enable touch began in UIScrollView?

Answer 2

You have 2 possibilities for detect the touch with - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event; in a scrollView:
first, implement this method in your viewController, and add the scrollview on this viewController.
second, which I recommend: make a custom class which is inherited from UIScrollView like this:
.h:
#interface CustomScrollView : UIScrollView
#end
.m:
#import "CustomScrollView.h"
#implementation CustomScrollView
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
[self.nextResponder touchesBegan:touches withEvent:event];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
if(!self.dragging){
[self.nextResponder touchesMoved:touches withEvent:event];
}
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
[self.nextResponder touchesEnded:touches withEvent:event];
}
#end
in your vc make:
...
CustomScrollView* customScrollView = [[CustomScrollView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)];
...
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
NSLog(#"View touched: %#", touch.view);
}