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iOS Build a Vending Machine App in Swift 2.0 Modeling An Interface Laying the Groundwork

Posted by Thomas Katalenas
Thomas Katalenas
11,033 Points

sectionInset

sectionInset creates a margin or spaceing

 var sectionInset: UIEdgeInsets

that is what api says on // https://developer.apple.com/library/prerelease/ios/documentation/UIKit/Reference/UICollectionViewFlowLayout_class/

what i think is funny is in the example code it is 

 layout.sectionInset = UIEdgeInsets(top: 20, left: 0, bottom: 10, right: 0)

so how come is layout "." as an attribute? and = sign and () paremters., is because there are multiple values? is that why the example code is different than API?

1 Answer

Chris Stromberg
PLUS
Chris Stromberg
Courses Plus Student 13,389 Points
Chris Stromberg
Chris Stromberg
Courses Plus Student 13,389 Points

layout has a property on it called "sectionInSet".

layout.sectionInset

The "sectionInSet" property is of type "UIEdgeSets"

So in order to use this property "sectionInSet" you have to set it to a type of "UIEdgeSets". This was done when they initialized it as a UIEdgeSets type passing in the parameters named: top, left, bottom, right.

UIEdgeInsets(top: 20, left: 0, bottom: 10, right: 0)

When you referenced the apple docs above, the declaration for "sectionInSet" displayed: 

 var sectionInset: UIEdgeInsets

If you click on the UIEdgeInsets portion it will take you to the developer page that explains how to create a UIEdgeInSet object. Located here: https://developer.apple.com/library/prerelease/ios/documentation/UIKit/Reference/UIKitDataTypesReference/index.html#//apple_ref/swift/struct/c:@S@UIEdgeInsets