Using drawRect, setNeedsDisplay and layoutSubViews

Question

Is there any basic rule for using methods like drawRect, setNeedsDisplay, and layoutSubViews? I believe that they negatively affect application performance. Are there any preferred alternatives for these posts?

Answer 1

While this is not an exact duplicate of this question , I believe my answer there still applies.

Thus, it -drawRect:will redraw the content in the view, which is an expensive operation. Avoid redrawing, if you can, by breaking up the contents and moving or hiding these layers as needed.

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