How to add images while moving finger across UIView? - objective-c

Question

I am having issues adding an image across a view while moving finger across the screen.
Currently it is adding the image multiple times but squeezing them too close together and not really following my touch.
EDIT:
What I want:
After taking or choosing an image, the user can then select another image from a list. I want the user to touch and move their finger across the view and the selected image will appear where they drag their finger, without overlapping, in each location.
This works:
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
currentTouch = [touch locationInView:self.view];
CGRect myImageRect = CGRectMake(currentTouch.x, currentTouch.y, 80.0f, 80.0f);
myImage = [[UIImageView alloc] initWithFrame:myImageRect];
[myImage setImage:[UIImage imageNamed:#"dot.png"]];
[self.view addSubview:myImage];
[myImage release];
}
New Question: How do I add spaces in this so that the image isn't so snug when drawing it on the view?

Answer 1

You might want to explain your question more, what exactly are you trying to achieve! If you dont want the images to overlap than you can try this!
UITouch * touch = [touches anyObject];
touchPoint = [touch locationInView:imageView];
prev_touchPoint = [touch previousLocationInView:imageView];
if (ABS(touchPoint.x - prev_touchPoint.x) > 80
|| ABS(touchPoint.y - prev_touchPoint.y) > 80) {
_aImageView = [[UIImageView alloc] initWithImage:aImage];
_aImageView.multipleTouchEnabled = YES;
_aImageView.userInteractionEnabled = YES;
[_aImageView setFrame:CGRectMake(touchPoint.x, touchPoint.y, 80.0, 80.0)];
[imageView addSubview:_aImageView];
[_aImageView release];
}

Answer 2

I'm sorry because I'm in company and I can't post too big data(the code). The squeezing is because you have not checked the touch point's distance with last touch point. Check a point whether it's in a view:bool CGRectContainsPoint (CGRect rect,CGPoint point);I mean remember a touch point in touchesBegan:. Update it if the new touches in touchesMomved: is bigger than image's width or left. And put the add image view in a method and call it use - (void)performSelectorInBackground:(SEL)aSelector withObject:(id)arg.

Answer 3

you can also use UISwipeGestureRecognizer as below instead of touchesMoved method,while swiping across the screen.in viewDidload:method,
UISwipeGestureRecognizer *swipeup = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:#selector(swipedone:)];
swipeup.direction = UISwipeGestureRecognizerDirectionUp;
swipeup.numberOfTouchesRequired=1;
[self.view addGestureRecognizer:swipeup];
method definition:
-(IBAction)swipedone:(UISwipeGestureRecognizer*)recognizer
{
NSLog(#"swiped");
UIImageView* _aImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"1.png"]];
_aImageView.frame = CGRectMake(10, 10, 100, 100);
_aImageView.multipleTouchEnabled = YES;
_aImageView.userInteractionEnabled = YES;
CGPoint point = [recognizer locationInView:recognizer.view];
[_aImageView setFrame:CGRectMake(point.x, point.y, 80.0, 80.0)];
[self.view addSubview:_aImageView];
[_aImageView release];
}
currently i am using this code for swipe up.i think it will works fine.once try it.