setNeedsLayout and setNeedsDisplay

StackOverflow https://stackoverflow.com/questions/14506968

  •  17-01-2022
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Question

What is the real difference between UIView methods setNeedsLayout and setNeedsDisplay?

As usual documentation is foggy about this.

Was it helpful?

Solution

Actually the documentation is pretty clear about this:

  • setNeedsLayout will layout subviews

    Call this method on your application’s main thread when you want to adjust the layout of a view’s subviews.

  • setNeedsDisplay will call for a redraw of your view (drawRect:, etc).

    You can use this method or the setNeedsDisplayInRect: to notify the system that your view’s contents need to be redrawn.

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