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iPhone App: implementation of Drag and drop images in UIView

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {

 

        NSLog(@"%f,%f", self.center.x, self.center.y);

        CGPoint newLoc = CGPointZero;

 

        newLoc = [self.mainView convertPoint:[[touches anyObject] locationInView:self.superview] toView:self.superview];

        float newX = newLoc.x + self.superview.frame.origin.x + (self.frame.size.width /2) + [[touches anyObject] locationInView:self].x ;

        float newY = newLoc.y - (((UIScrollView *)self.superview).contentOffset.y *2) ;

        NSLog(@"content offset %f", ((UIScrollView *)self.superview).contentOffset.y);

 

        self.scrollParent.scrollEnabled = NO;

        NSLog(@"%f,%f", self.center.x, self.center.y);

 

        newLoc = CGPointMake(newX, newY);

        [self.superview touchesCancelled:touches withEvent:event];                                                              

        [self removeFromSuperview];

        NSLog(@"%f,%f", self.center.x, self.center.y);

 

 

        self.center = CGPointMake(newLoc.x, newLoc.y);

        [self.mainView addSubview:self];

        NSLog(@"%f,%f", self.center.x, self.center.y);

 

        [self.mainView bringSubviewToFront:self];

        isInScrollview = NO;

}  

 

-(void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {

 

    [UIView beginAnimations:@"stalk" context:nil];

    [UIView setAnimationDuration:.001];

    [UIView setAnimationBeginsFromCurrentState:YES];

 

    UITouch *touch = [touches anyObject];

 

    self.center = [touch locationInView: self.superview];

 

    [UIView commitAnimations];

    if ((self.center.x + (self.frame.size.width / 2)) > 150 && hasExitedDrawer && !self.scrollParent.dragging ) {

        self.scrollParent.scrollEnabled = NO;

 

        [self.delegate moveItemsDownFromIndex: ((self.center.y + (self.scrollParent.contentOffset.y)) / 44) + 1 ];

        //NSLog(@"%i", ((self.center.y + (self.scrollParent.contentOffset.y *2)) / 44) + 1);

    }

 

    if (self.center.x + (self.frame.size.width / 2) < 150) {

 

        hasExitedDrawer = YES;

 

    }

 

}  

 

-(void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {

 

    if ((self.center.x + (self.frame.size.width / 2)) > 150 && hasExitedDrawer && !self.scrollParent.dragging ) {

        CGPoint newLoc = CGPointZero;

 

        newLoc = [self.scrollParent convertPoint:[[touches anyObject] locationInView:self.superview] toView:self.superview];

        float newY = newLoc.y + (self.scrollParent.contentOffset.y *2);

 

        [self.scrollParent insertSubview:self atIndex:((self.center.y + (self.scrollParent.contentOffset.y)) / 44) ];

        self.frame = CGRectMake(0, newY, self.frame.size.width, self.frame.size.height);

        isInScrollview = YES;

        hasExitedDrawer = NO;

    }

}