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A single ‘Kitten’ model must be an object or struct that conforms to the Identifiable protocol for SwiftUI to be able to iterate through it in the ForEach. Based on the KittensModel, it renders a list of KittenViews that are lazily loaded. I created a simple View that embeds a LazyVStack in a ScrollView. Both normal stacks and the ‘lazy’ ones are not scrollable out of the box. The UI will be similar to using a UITableView in UIKit or a UICollectionView with a single row or column.Ĭompared to the old solution, the new ‘lazy’ stack view does not load embedded views until it needs to render them on screen, but this works only when a LazyStack is placed inside a ScrollView. LazyStacksįrom iOS 14 on, instead of using VStack or HStack and putting one of these components inside a ScrollView, developers may use LazyVStack or LazyHStack. In this article, I explain the basics of the new and related components presented at WWDC2020 session and suggest when to use them. To make grids scrollable, they must be wrapped inside a ScrollView with the appropriate axis: ScrollView(.After the last SwiftUI update, there is no short answer from Apple regarding when to use what component when creating a new app or moving from the UIKit. It’s a bit of a tongue-twister, so here is an animation that explains it much better. In VStack, all views are rendered and loaded in memory as soon as view is initialized and appears on screen. #VSTACK VS LAZYVSTACK FULL#Alternatively, a LazyHGrid will place cells horizontally in columns, when a column is full (i.e., all its rows used), it will continue to the next column. ‘Lazy’ keyword distinguishes LazyVStack from VStack. It is particularly useful when we have large list of contents inside a scrollview. When a row is full (i.e., all its columns used), it will continue down to the next row. If we want to load the content into memory when we need it, we can use LazyVStack. However, depending on the context, it could be confusing, so I will use the term cell instead.Ī LazyVGrid will place its cells vertically but arranged in rows. Note that the official term in Apple’s documentation is “child view”. In the rest of this post, I will use the term cell to refer to each of the views laid out by the Lazy*Grid views. In that case, this paragraph becomes relevant, otherwise… you can forget about it. This is only important if your un-rendered view has some kind of background task (e.g., subscribed to a publisher). You don’t need to worry too much about all this. In reality, Bindings are just closures that read/write directly from the source of truth variables (e.g., which usually belong to a different view. This makes sense, as Binding variables do not store any real data. With LazyVStack, in this example, we can scroll. #VSTACK VS LAZYVSTACK UPDATE#However, if the parameter is a it will update in the subview immediately. See that LazyVStack has flexible width and it covers all the screen whereas VStack fits in its context. This means you can continue to update the view’s state, even if it is not being rendered.įinally, although your view continues to exist (albeit un-rendered) when its parent updates a parameter of the subview, that value will only change in the subview, when it is rendered again. However, although non-rendered items are removed from the hierarchy, their states continue to exist in memory, so when they scroll back, their states remain unaltered.Īlso consider that if your view has a timer or any other publisher, it will continue to fire. It is important to note that the onAppear and onDisappear closures will fire as the views go in and out of view when scrolled. Apple recommends that you use their Lazy versions, but only if needed. On the other hand, HStack groups two Text () views, Agile and Unstoppable, in left-to. This is the result: As you can see, VStack arranges the Text (), HStack, and Zstack as a top-to-bottom list. Each of them have views inside, like Text () and Image (). We also have LazyVStack and LazyHStack, which are the same as VStack and HStack, except they avoid rendering off-screen views. In the example below, you will see a combination of VStack, HStack, and ZStack. When they are off-screen, they are not part of the view hierarchy. If we want to load the content into memory when we need it, we can use LazyVStack. The Lazy prefix in LazyVGrid and LazyHGrid indicates that the views contained in the grid are only rendered when on screen. |
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