使用渐变缩放UIView

Question

I'm developing an animated column bar chart and i having some trouble. The bars show up with an scale animation. At the beginning all columns have 1 point size and will scale till a predefined height.

The point is: I want to draw a gradient into the columns (They are subclasses of UIView) and want the scale animation to recalculate the gradient.

Until now, i have drawn the gradient, but when the column scale, the gradient does not scale with it. As the view have 1 point height, the gradient is show as 1 color only.

Can someone give me a north to solve this issue?

Answer 1

Solved the problem!

i was using scale instead of changing the view's bounds.. Was

view.transform = CGAffineTransformMakeScale(1.0, scaleY.floatValue);

Must be

view.bounds = CGRectMake(view.bounds.origin.x, view.bounds.origin.y * scaleY.floatValue, view.bounds.size.width, view.bounds.size.height * scaleY.floatValue);

Where scaleY was calculated before and is a NSNumber that contains the Y scale factor. It's not necessary to set

 view.contentMode = UIViewContentModeRedraw;

Thank you DarkDusk for the help.

Answer 2

Try setting the contentMode :

myView.contentMode = UIViewContentModeRedraw;

This will force a redraw on every size change.