touchesBegan and touchesMoved stuck - iphone

Question

i am using this code in my app to recognize touch and drag on specific UIView,
now i have a problem that if i make the touch and immediate make a drag the touchesMoved called only 3-4 times and stop and then the touchesCancelled called, but if i touch the screen wait a second and then make a drag it call touchesMoved every time the finger move.
Edit
Ijust tested it on iphone 4s and with this device it work perfect,in ipod4 it still have the problem. both device are with 5.01 .
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
NSArray* touchArray = [touches allObjects];
UITouch* touch = [touchArray objectAtIndex:0];
CGPoint point = [touch locationInView:self.view];
UIView *tmp = [self.view hitTest:point withEvent:event];
if (tmp == volumeViewBackground) {
//do something
}else {
NSLog(#"err");
}
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
NSArray* touchArray = [touches allObjects];
UITouch* touch = [touchArray objectAtIndex:0];
CGPoint point = [touch locationInView:self.view];
UIView *tmp = [self.view hitTest:point withEvent:event];
if (tmp == volumeViewBackground) {
//do something
}else {
NSLog(#"err");
}
}
-(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event{
NSLog(#"error");
}

Answer 1

Try calling super according to UIResponder Class Reference.
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
[super touchesBegan: touches withEvent: event];
NSArray* touchArray = [touches allObjects];
UITouch* touch = [touchArray objectAtIndex:0];
CGPoint point = [touch locationInView:self.view];
UIView *tmp = [self.view hitTest:point withEvent:event];
if (tmp == volumeViewBackground) {
//do something
}else {
NSLog(#"err");
}
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
[super touchesMoved: touches withEvent: event];
NSArray* touchArray = [touches allObjects];
UITouch* touch = [touchArray objectAtIndex:0];
CGPoint point = [touch locationInView:self.view];
UIView *tmp = [self.view hitTest:point withEvent:event];
if (tmp == volumeViewBackground) {
//do something
}else {
NSLog(#"err");
}
}
-(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event{
[super touchesCancelled: touches withEvent: event];
NSLog(#"error");
}