iosuiviewdrawrectlayoutsubviews

How to invoke drawRect: when layoutSubviews invokes in ios

I am using drawRect: to draw shapes. I have to invoke this method and redraw the shapes when orientation changes, so i thought if there is a way to invoke drawRect: automatically when layoutSubviews() been called.

Thank you.

Solution

  • You can set the view's contentMode to .redraw.

    This will invoke setNeedsDisplay (and therefore drawRect) whenever the view's bounds change, and will therefore also be invoked upon rotation (provided you've setup your autoresizingMask so that the view's bounds change on rotation).