TrackAllTouches.xm

// Works on iOS 16 and later. Works by hooking backboardd.
// { Filter = { Executables = ( "backboardd" ); }; }

#import <UIKit/UIKit.h>

@interface BKTouchContact : NSObject {
    CGPoint _normalLocation;
}
@end
@interface BKTouchContactSet : NSObject {
    NSMutableArray<BKTouchContact *> *_contacts;
}
- (long long)count;
@end

%hook BKTouchContactSet

- (long long)count {
	NSMutableArray *array = MSHookIvar<NSMutableArray *>(self, "_contacts");
	if (array.count > 0) {
		// _normalLocation components range from 0 to 1
		BKTouchContact *contact = array[0];
		CGPoint point = MSHookIvar<CGPoint>(contact, "_normalLocation");
		// Use point here ...
	}
	return %orig;
}

%end