iosobjective-cuitableviewcgaffinetransformscale

iOS CGAffineTransformScale keep left anchor

I am using CGAffineTransformScale to scale down my UITableView, it is scaling it down correctly but i can't seem to set the anchor point correctly. 

self.myTableView.transform = CGAffineTransformScale(CGAffineTransformIdentity, 0.8, 0.8);

If I don't set the anchor point it scales it down from the center but as my requirement I need to keep the left top corner point fixed. For this I've used this 

self.myTableView.layer.anchorPoint = CGPointMake(0, 0);
self.myTableView.transform = CGAffineTransformScale(CGAffineTransformIdentity, 0.8, 0.8);

But this doesn't set the anchor correctly.. One more thing I haven't used AutoLayout

Please can anyone help me out on this…? thanks in advance..

Solution

  • Try this

    [self setAnchorPoint:CGPointMake(0, 0.5) forView:recognizer.view]; // for left anchor point

    and here setAnchorPoint

    -(void)setAnchorPoint:(CGPoint)anchorPoint forView:(UIView *)view
{
CGPoint newPoint = CGPointMake(view.bounds.size.width * anchorPoint.x,
                               view.bounds.size.height * anchorPoint.y);
CGPoint oldPoint = CGPointMake(view.bounds.size.width * view.layer.anchorPoint.x,
                               view.bounds.size.height * view.layer.anchorPoint.y);

newPoint = CGPointApplyAffineTransform(newPoint, view.transform);
oldPoint = CGPointApplyAffineTransform(oldPoint, view.transform);

CGPoint position = view.layer.position;

position.x -= oldPoint.x;
position.x += newPoint.x;

position.y -= oldPoint.y;
position.y += newPoint.y;

view.layer.position = position;
view.layer.anchorPoint = anchorPoint;
}