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I have some issues with auto layout, hopefully some of you can help me =).
I add a UIView to an empty view controller, like this:
Then I add constraints for leading and trailing space, like this:
Which results in this:
I can't understand why it sets them as equal to -16.0. If I change those values to 0, then Xcode complains about the width of the gray UIView.
When I run the app on iPhone 5 simulator, it looks fine:
However, when I run the app on iPhone 6 Plus simulator it adds white space on the left and on the right:
I don't want the gray UIView to have any space from the left of from the right no matter how big the screen is. How can I fix it? Thanks!
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Auto Layout defines margins for each view. These margins describe the preferred spacing between the edge of the view and its subviews. You can access the view's margins using either the layoutMargins or layoutMarginsGuide property. The layoutMargins property lets you get and set the margins as a UIEdgeInsets structure.
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.
Open the Align menu with the yellow button selected and check Horizontally in Container, then click Add 1 Constraint. Now, select both buttons at the same time using the Shift key and, in the Align menu, check Leading Edges. Again, actually install the constraint by clicking Add 1 Constraint.
To create constraints select the button and click the Align icon in the auto layout menu. A popover menu will appear, check both “Horizontal in container” and “Vertically in container” options to center the button on the screen. Then click the “Add 2 Constraints” button. Run the application.
Double click the constraint and open it. There select first or second item and deselect "Relative to margin". Then set your constant as 0.
Xcode is showing -16 because it is calculating space with respect to a margin and not the edges.
Check following link for more info on margins. Editing Auto Layout Constraints
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