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I'm trying to create dynamically resizing table view cells. I accomplished the resizing by using this answer, which is very detailed and helpful.

However, the maximum width for the label is not being calculated correctly inheightForRowAtIndexPath.

My cell currently only has one label in itscontentView, with constraints set to pin all the label edges to thecontentView edges. Here's what I have in IB enter image description here

The cell size is being calculated with an offscreen cell inheightForRowAtIndexPath using 

CGSize size = [cell.contentView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize];

During this process, it seems like it's honoring the constraints, and the label.preferredMaxLayoutWidth property is being set to 320, but when the label actually gets rendered, there is still padding.

enter image description here

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The paddings is layout margins. You have to be beware of Constrain to margins option.

Constrain to margins is Enabled: enter image description here

Constrain to margins is Disabled: enter image description here

How to disable it?

  1. You can double-click the one of constrains and unchecking the Relative to margin option:

enter image description here
enter image description here

  1. Unchecking the Constrain to margins while creating the constraints of the label:

enter image description here

Related link:
What is "Constrain to margin" in Storyboard in Xcode 6

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Thank you so much! I've been searching for this for hours

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