![]() ![]() I’d rather get this working than revert to the UITableView + ObservationToken implementation. I believe I’ve isolated this to the use of LazyVStack/List/ForEach as if I remove this code or iterate over the Results indices instead of the Results directly the application does not eventually crash. These components are used in a similar way to regular HStack and VStack components but. If I use a LazyVStack, it's continuously loading. If I use a Vstack, everything works fine. The issue I’m facing now is that as my app runs and continues to modify/append items to the database (in collections OTHER to the ones being displayed) for some reason the number of active versions continues to grow and eventually crashes the application.Įither with a message indicating the maximum number of application versions being exceeded or if I remove that limit with another more nefarious looking crash reason significantly later on. SwiftUI 2.0 introduced the LazyHStack and LazyVStack components. LazyVStack is continuously loading (not obeying cache) I have a LazyVStack that I'm using to load in an array of objects using a custom View. I’ve recently migrated some code in one of my projects from using a ‘self-built’ ObservedResults solution with a UITableView to the one provided by Realm Swift with a SwiftUI native view using LazyVStack and ForEach - thanks for implementing that by the way. Unfortunately it’s only available in iOS 14. WWDC2020 offered a new suite of Views, one interesting one is LazyVStack which allow us to delay the initialization of some content only when 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 (). Slider(value: $progress, in: 0.0.1.0, step: 0.01) Conditionally use VStack in iOS 13 or LazyVStack in iOS 14. In the example below, you will see a combination of VStack, HStack, and ZStack. Struct ContentView: View private var progress: Double = 0.0 But I saw that LazyVStack was much more efficient than List, thanks to it's still far behind UITableView. My original question was List vs UITableView. It is particularly useful when we have large list of contents inside a scrollview. On the other hand, VStack is a little opposite with this, it loads everything. Hello guys I started this channel talking about stacks in SwiftUI, today we will talk about another stack: LazyVStack. If we want to load the content into memory when we need it, we can use LazyVStack. 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. Only when I pull down super aggressively it works. In the following example, a ScrollView contains a LazyVStack that consists of a vertical row of text views. ![]() Im having some problems with my scrollview where as you can see in the video, it wont bounce without trying to reset the position to 0 all the time. items until it needs to render them onscreen. I like to work with List in my apps as it provides some more functionality than just a ScrollView with a stack of content inside. LazyVStack behaviour is similar with VStack with the exception of lazy. ScrollView + LazyVStack Stuttering bounce. It's still far behind UITableView but better than List. With LazyVStack, in this example, we can scroll vertically by dragging anywhere on the. Yes, the CPU usage drops to 25 with LazyVStack. See that LazyVStack has flexible width and it covers all the screen whereas VStack fits in its context. Does anyone know how I can reduce the CPU used by SwiftUI? There is LazyVStack to work with a large amount of content inside a ScrollView and ensure good scrolling performance. 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. But while UIKit consumes 5% CPU, SwiftUI consumes 26% CPU. One was written with SwiftUI and the other with UIKit. ![]()
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