touchesbegan, touchesmoved, touchesended issue - iphone

Question

For various reasons, I've moved these methods from a UIView subclass to my viewcontroller. And I finally got it working, except for one thing. Not only am I able to drag the UIImageviews I've programmatically created, but the actual view controllers view is draggable too. Creating this much undesired effect. I guess it's the fact that it's touches anyobject, and the background itself is an object. I'm just not sure how exclude the background. I would think that it would need the "UserInteraction enabled", but I guess not? I only want it to make UIImageViews draggable. Please forgive my noobness. I'm still learning.
I have all the imageviews i'd want "touchable" in an NSMutableDictionary called "letterDictionary". Would it be possible to only have touch apply to what's in the dictionary?
http://imgur.com/W08dI
- (void) touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event {
UITouch *touch = [touches anyObject];
touchPoint = [touch locationInView:self.view];
movingLetter = [touch view];
CGPoint pointInside = [touch locationInView:[touch view]];
if ([movingLetter pointInside:pointInside withEvent:event]) touchedInside = YES;
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
if (touchedInside) {
UITouch *touch = [touches anyObject];
CGPoint newPoint = [touch locationInView:self.view]; // get the new touch location
movingLetter.center = CGPointMake(movingLetter.center.x + newPoint.x - touchPoint.x, movingLetter.center.y + newPoint.y - touchPoint.y);
touchPoint = newPoint;
}
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
if (touchedInside) {
UITouch *touch = [touches anyObject];
CGPoint newPoint = [touch locationInView:self.view];
movingLetter.center = CGPointMake(movingLetter.center.x + newPoint.x - touchPoint.x, movingLetter.center.y + newPoint.y - touchPoint.y);
if (CGRectIntersectsRect([movingLetter frame], [placeHolder frame]))
{
movingLetter.center = placeHolder.center;
}
}
touchedInside = NO;
}
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {
touchedInside = NO;
}

Answer 1

You have the view that was touched,
UITouch *touch = [touches anyObject];
touchPoint = [touch locationInView:self.view];
movingLetter = [touch view];
just test to see if it is the class you are looking for (e.g. a UIImageView) then return
UITouch *touch = [touches anyObject];
if (![[touch view] isKindOfClass:[UIImageView class]])
{
return;
}

Answer 2

In this touchesBegen Method :
-(void)touchesBegan:(NSSet* )touches withEvent:(UIEvent *)event
{
[self.view endEditing:YES];
UITouch *touch = [touches anyObject];
_previousPoint1 = [touch previousLocationInView:self.main_uiview];
_previousPoint2 = [touch previousLocationInView:self.main_uiview];
_currentPoint = [touch locationInView:self.main_uiview];
[self touchesMoved:touches withEvent:event];
self.bezierPath = [UIBezierPath bezierPath];
[self.bezierPath moveToPoint:_currentPoint];
}
TouchesMove Method
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent* )event
{
UITouch *touch = [touches anyObject];
_previousPoint2 = _previousPoint1;
_previousPoint1 = [touch previousLocationInView:self.main_uiview];
_currentPoint = [touch locationInView:self.main_uiview];
lastPoint = _currentPoint;
[_bezierPath addLineToPoint:lastPoint];
// calculate mid point
CGPoint mid1 = midPoint4(_previousPoint1, _previousPoint2);
CGPoint mid2 = midPoint4(_currentPoint, _previousPoint1);
UIGraphicsBeginImageContextWithOptions(self.bg_imageview.frame.size, NO, 0.0);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetLineWidth(context,brush);
CGContextSetLineCap(context, kCGLineCapRound);
CGContextSetLineJoin(context,kCGLineJoinRound);
[self.bg_imageview.image drawInRect:CGRectMake(0, 0, self.bg_imageview.frame.size.width, self.bg_imageview.frame.size.height)];
CGContextMoveToPoint(context, mid1.x, mid1.y);
// Use QuadCurve is the key
CGContextAddQuadCurveToPoint(context, _previousPoint1.x, _previousPoint1.y, mid2.x, mid2.y);
CGContextSetLineCap(context, kCGLineCapRound);
CGContextSetStrokeColorWithColor(context,[UIColor blackColor].CGColor);
CGContextSetLineWidth(context, 3.0);
CGContextStrokePath(context);
self.bg_imageview.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();}