Hstack vs vstack how to#
Hstack vs vstack code#

The first option will make sense when we start working with custom alignment guides, later on. This type is a struct, with some useful information about the view for which we are creating the alignment guide: public struct ViewDimensions But what’s most interesting about this method, is that the computeValue closure provides us with a parameter of type ViewDimensions. It’s an overloaded method, with two versions, one for horizontal guides, and one for vertical guides. alignmentGuide() method declaration: func alignmentGuide(_ g: HorizontalAlignment, computeValue: (ViewDimensions) -> CGFloat) -> some Viewįunc alignmentGuide(_ g: VerticalAlignment, computeValue: (ViewDimensions) -> CGFloat) -> some View It could be challenging to calculate such a number if we didn’t have some data to work with. It is an arbitrary number we must return. We’ve seen so far that we specify alignment guides as a CGFloat in the computeValue closure of the. You may wonder, what happens if we do not specify an alignment parameter for VStack, HStack or ZStack? Well, they do have a default. The value of the implicit alignment will be provided by the alignment parameter in the container view (e.g., VStack(alignment. When we leave it unspecified, it is implicit.

alignmentGuide(), the alignment is explicit. Explicit AlignmentsĮvery view in a container has an alignment.It’s highlighted, because it is one of the most important concepts to remember. Text Alignment: For multiline text views, it specifies how the text lines are aligned inside the text view. This is an explicit value (i.e., one that was defined programmatically by you).įrame Alignment: Indicates how are all the contained views aligned (as a unique group), inside the container. This is a default (implicit) value associated with a given guide.Įxplicit Alignment Value: It’s a numeric value, indicating the position of the guide for the view it modifies. There are some handy preset values such as d.width, d, d, etc, but ultimately we are returning a numeric value. Implicit Alignment Value: It’s a numeric value, indicating the position of the guide for the view it modifies. But it also defines implicit alignment guides for all its contained views that do not have an explicit guide.Īlignment Guide: Unless this value matches the Container Alignment parameter, this guide will be ignored during layout. It dictates which alignmentGuides() are to be ignored and which ones aren’t. I’ll provide a basic description here, but we’ll elaborate further, down below.Ĭontainer Alignment: It has two purposes. We are going to dive deep into each of these parameters, and they will all make sense to you soon.

The views will be positioned, so that the beginning of view A (zero points from its beginning), is aligned with the 20th horizontal point of View B and the 10th horizontal point in C: Their horizontal guides are 0 (zero), 20 and 10 respectively. Suppose we have three views (A, B and C). To continue explaining the concept, let’s explore horizontal alignments first. Note that alignments can be vertical or horizontal.

Hstack vs vstack how to#

It sets a point in a view, that determines how to position it in relation to the rest of its siblings. What Is an Alignment GuideĪn alignment guide is basically a numeric value. It will let you see visually what happens during alignment.īy the end of this post, you should be confident about what can and cannot be done with alignment guides.

Hstack vs vstack code#

The code included, will also serve as a learning app. In this article, I will try to remove all the confusion around the topic, so we know exactly what to expect and how to get the results we want. If you remember one thing from this article, it should be this: EVERY VIEW inside a container, has an alignment guide. When we ignore them, things do not go our way.

This confusion comes from not realizing there’s a whole set of implicit alignment guides in effect. However, there’s confusion about what we expect from them. Since we are in the early stages of SwiftUI, you may think… bah! just another bug, disregard and move to something else.Īfter spending some time testing the limits of alignment guides, I arrived at the conclusion that they do work. They tend to do what you expect them to do, until they don’t. If you ever tried using alignment guides though, chances are, you may have been puzzled by the results.