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I tried to create a custom freefrom view with interface builder. I have a UIView which is containing a UIImageView and UILabel. I set the constraints to adjusting the Label according to the Image etc and a margin to the superview.
Now I want the superview to exactly fit the subviews. But when I press Editor -> Size To Fit Content, the superview is not resized completely and the constrains are in conflict. What there appears is a implicit constraint ("iPhone Portrait Screen Height"), which can not be altered/deleted. See Screenshot below:
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Aspect ratio constraint is used to control the width and height of a view as per a aspect ratio that you set here. There are some standard presets such as 1:1 which means width will be equal to height. Similarly other presets calculates the dimensions based on a ratio.
Intrinsic content size is information that a view has about how big it should be based on what it displays. For example, a label's intrinsic content size is based on how much text it is displaying. In your case, the image view's intrinsic content size is the size of the image that you selected.
With constraints, you can say “these items are always lined up in a horizontal row” or “this item resizes itself to match the height of that item.” Constraints provide a layout language that you add to views to describe geometric relationships. The constraints you work with belong to the NSLayoutConstraint class.
In general, the intrinsic content size simplifies the layout, reducing the number of constraints you need. However, using the intrinsic content size often requires setting the view's content-hugging and compression-resistance (CHCR) priorities, which can add additional complications.
While not ideal, depending on how your XIB is structured and how you are referencing the view, you could create a "scratch pad" view and place your custom view inside of that just to see how everything will layout. That is if you're setting the view to an outlet defined in the XIB's File Owner, you can just connect it to the view you've created inside the "scratch pad".
For example, I created a container view with a square and a switch inside. The top example complains of conflicting constraints and doesn't layout correctly, while the bottom example shows the same thing centered in a throw-away view. Again, not ideal, but it's working for me.
Edit: I just realized that some size class constraints may be lost once the "scratch pad" view is discarded so that is another wrinkle to consider. Still looking into this.
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