![]() ![]() So now that we know more about these two views, let's get started with testing them out! But just before we get started, I will be using a clean project(which I assume is obvious, since this stuff is brand new haha) for this tutorial and if you want to take a look at the source code, you can find it here. You can take a look at the Apple docs here( LazyVGrid, LazyHGrid). When using LazyVGrid the grid will grow vertically, and when using a LazyHGrid the grid will grow horizontally. To start off with, what is LazyVGrid and LazyHGrid? According to Apple, it is a container view that arranges its child views into a grid. So, in todays tutorial, we will be going through some of the basics of how to use these two new views. One or two of them being LazyVGrid and LazyHGrid. If you read the code carefully, you probably noticed that, unlike UIKit drop delegate, in SwiftUI, we create a drop delegate object for every row in the stack, again, because of the declarative nature of the framework.SwiftUI has just been updated and it has some great new features/views. Note: If Xcode doesn’t recognize UTType, you need to import the UniformTypeIdentifiers framework. If I add fixedSize(horizontal: false, vertical: true) to the Text element it seems to stop stuttering. ![]() ![]() We still have the ability to adjust the horizontal adjustment, the spacing and to pass the content in a. Here’s how we can offer either a VStack in iOS 13 and the new shiny LazyVStack in iOS 14: With this quick trick, we now can use MyVStack following the same API as Apple provides us. In this case, the onDrop() view modifier accepts two parameters – the type of content allowed to be dragged - (UTType.text), and a delegate (conforms to DropDelegate protocol) describes the behavior of the drop. 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. You can easily achieve this by creating your own wrapper. onDrop(of:, delegate: MyDropDelegate(item: item, items: $items, draggedItem: $draggedItem)) This is the variable that stores the dragged item. Notice I added a new state named “draggedItem”. Now, because SwiftUI is a declarative framework, we need to add a view modifier for each view that handle the dragging. Let’s create a simple LazyVStack, with three items only:įor the simplicity of the tutorial, the items list is an array of strings, and I also colored the views with red. On the other hand, VStack is a little opposite with this, it loads everything. 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 doesn’t matter what layout we choose – we can apply it to any layout since the updates are derived from data changes. LazyVStack behaviour is similar with VStack with the exception of lazy. Reordering items with drag and drop is relevant not only to LazyVStack but to any other layout such as LazyHStack, List, and even VStack and HStack. Detect dragging updates and update the state according to the changes. Declare what views can be draggable and what views can receive drops. The API handles the animation and UI updates for us. Attach a dragging delegate to a UICollectionView or UITableView. The reason is that SwiftUI is a declarative framework – we describe how the UI behaves and how it is connected to the data, and the magic happens only by updating the data (“State”).īut this approach creates new challenges and changes to how we work. ![]() While in UIKit, we are expected to synchronize the changes between the data and the UI, in SwiftUI, the framework does this job for us. “Drag and Drop” become super straightforward, and the API handles most of the cases itself.īut what happens with SwiftUI? Do we have the same simple API like UIKit? Main Difference Between SwiftUI and UIKitīoth frameworks are remarkable, but they work differently. Those of you who are familiar with UIKit iOS 11 Drag and Drop API probably know that it dramatically improves UITableView and UICollectionView reordering user experience. ![]()
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