Why do we override drawrect: method? How to explicitly call it?
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Answer / Sandeep Kaumr
Overriding the drawRect: method in a custom UIView subclass allows you to customize the view's drawing behavior. It gets called by the system when the view needs to be redrawn, such as after layout changes or when appearing on screen.nnTo explicitly call drawRect:, you can use the setNeedsDisplay or setNeedsLayout methods of UIView. These will trigger a redraw cycle, resulting in the drawRect: method being called.nnNote that ARC does not automatically manage the lifetime of objects created within the drawRect: method, so be careful to retain any such objects if they need to persist beyond the current draw cycle.
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