UITouch object behaving oddly - iphone

Question

I wanted to get points where user is touching on the screen therefore I wrote following code which will fire when user will touch somewhere on the screen
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
[super touchesBegan:touches withEvent:event];
UITouch *touch = [[UITouch alloc] init];
touch = [touches anyObject];
CGPoint point = [touch locationInView:self];
if (CGRectContainsPoint([dob frame], point)) {
[self showDatePickerforDOB:YES];
}
}
but this code is giving run time error. Upon debugging it was revealed that locationInView is not recognized as a function of touch object on the other hand it is documented in iphone class reference documentation. When I changed code to exclude alloc i.e
UITouch *touch;
touch = [touches anyObject];
then locationInView is perfectly working fine. Any ideas why UITouch *touch = [[UITouch alloc] init]; is giving runtime error.

Answer 1

I think you should not alloc and init the touch pointer, the correct code should be:
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
[super touchesBegan:touches withEvent:event];
UITouch *touch = [touches anyObject];
CGPoint point = [touch locationInView:self];
if (CGRectContainsPoint([dob frame], point)) {
[self showDatePickerforDOB:YES];
}
}
[touches anyObject] will return an autorelease object so you don't need to alloc and init the touch pointer.

Answer 2

I got the reason why there was an error. It was because of line
CGPoint point = [touch locationInView:self];
when I changed it to CGPoint point = [touch locationInView:self.view]; runtime error was removed. The reason is that locationInView function takes UIView as its parameter and on the other hand i was giving it a delegate i.e 'self'.
so self.view solved the issue