The thing is that you need to change the ScrollView to be. ‘Lazy’ keyword distinguishes LazyVStack from VStack. On the other hand, VStack is a little opposite with this, it loads everything. A VStack is a free-form StackView that contains arbitrary combinations of other views and manages their layout and organization. Lazy in many instance means if you are not you are not seeing it in your screen, it is not being loaded which in turn increases performances. It does lazy loading of cells but brings with it a lot of baggage and limitations that stem from the TableView need for delegates, and from the underlying cell-based table view structure. If I add fixedSize(horizontal: false, vertical: true) to the Text element it seems to stop stuttering. LazyVStack behaviour is similar with VStack with the exception of lazy.
#Vstack vs lazyvstack code#
So what should you do it fix it? Try it before looking at the code below. I ripped everything out in my view and built it back up one by one the LazyVStack begins to stutter as soon as I put a VStack/HStack/ZStack around a simple Text element.
Must be wondering what is going on there. Because all views are built lazily, there are no other views above that one and therefore, there's nothing to focus and I cannot scroll up and I'm stuck. 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 (). Before you read further, I want you to try the code from the LazyHStack section and just change the LazyHStack to LazyVStack.Ĭheck the output in the debug window. However, from time to time the LazyVStack scrolls its content in such a way that the panel containing the call to action button is at the top edge of the screen. In the example below, you will see a combination of VStack, HStack, and ZStack. H and V of Grid/Stack view define layout direction.
#Vstack vs lazyvstack how to#
Here’s the code snippet of how we configure. How to use LazyHGrid, LazyVGrid, LazyVStack and LazyHStack Photo by Markus Winkler on Unsplash. Our main objective so far is to change the colour while the user is pressing on the cell. It's still far behind UITableView but better than List. Yes, the CPU usage drops to 25 with LazyVStack. If you want to load content lazily i.e., only when it scrolls into view, you should use LazyVStack and LazyHStack as appropriate. Replacing the List with a ScrollView and LazyVStack gives you performance similar to the tableview, since that works the same way, rendering only the visible rows. NavigationLink(destination: DetailView(url: url, animated: self.LazyVStack works very similar to LazyHStack, it's just that it will align the items vertically. Well, the reason is because of the Configuration.isPressed. By default, SwiftUI’s VStack and HStack load all their contents up front, which is likely to be slow if you use them inside a scroll view.
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