Swiftui geometryreader frame

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• leading) Spacer() Feb 21, 2024 · GeometryReader { proxy in Image(. GeometryReader always grows as much as possible. I'm not sure how to work around this. VStack {. Feb 20, 2023 · Geometry Reader is a useful tool for any SwiftUI developer as it allows us to get the exact size and location of objects on the screen. frame(width: proxy. ZStack {. frame(width: geometry. 8) } Typically I use the GeometryReader as a "Root" view and scale everything off of it, however you can place it inside of another view or even as an overlay to get the parent view size. The correct usage is in @Александр_Грабовский Apr 1, 2020 · My scrollview with vStack worked (in AppleTV - i did not test in iOS) without GeometryReader. Mar 12, 2021 · 2. On the VStack 2, I need to put a GeometryReader to get the height of VStack (VStack 2). gray. size of the parent. var label: String. The GeometryReader can expand to fill an entire screen or can share a screen with other views within a stack. Most of the time, when we apply a modifier on a view, a new view is created that is wrapped around the view being “modified”. So you should never need to use a GeometryReader unless you want to do something like manually placing a view somewhere within another view's coordinate space. struct GeometryProxy3D. ForEach(0. My GeometryReader was working fine in iOS13 but now in iOS14 i get a thread issue. Any reason Layout your subviews `viewDidLayoutSubviews` // Update subview frame size // Must be done in `viewDidLayoutSubviews` // Otherwise in `viewDidLoad` the bounds equal `UIScreen. func makeView(with geometry: GeometryProxy) -> some View {. Sep 14, 2020 · I briefly thought I had a solution using UIScreen. Nov 29, 2019 · So your example would be something like: FormView() . padding() back out of the view. This is probably not a very reliable way to get a consistent layout across different sizes of display. clear. Assigns a name to the view’s coordinate space, so other code can operate on dimensions like points and sizes relative to the named space. frame() over it that tells it it cannot be any bigger than the original Text, so it is cutting the . Im sure its hitting the point where viewHeight is set by using May 1, 2020 · GeometryReader 是個看不到的容器，它的參數 geometry 可告訴我們它的位置大小。 設計 SwiftUI App 畫面時，我們通常不太需要思考元件的座標尺寸，不過 Jul 15, 2019 · Careful: with 1pt size it gave me a 5. According to Apple, GeometryReader is "a container view that defines its content as a function of its own size and coordinate space. Text("\(randomRoll)") . maxWidth: geometry. Aug 2, 2020 · This works all nice and well, except when the position of those views change, e. The newly created grid cells will be placed directly in the updated position . remove second TextField frame limitation (ie. width / 2) } } Jan 9, 2023 · Here, nextValue: () -> Self. Inside this VStack, I have an other VStack (VStack 2) that get height according to its childrens (Text), and I want to put it at the bottom of this parent (VStack 1). infinity, maxHeight: . Here is worked solution. Sep 10, 2019 · 10. The geometry reader measures the entire screen, because you put the geometry reader right on top in the body of the view. Additionally, the GeometryReader is adaptive when the device rotates. That is the intended behavior. in. Feb 6, 2022 · The expected functionality is to print the shown object id when the user scrolls. If value of origin. If not limited by anything (i. But it does not change, what could be the issue? The current index should change when user scrolls without pressing the buttons. GridView1(width: geo. 那么SwiftUI布局的核心原理是什么呢？. struct ContentView: View {. If you find that performance is not bad when the scroll position is not tracked then maybe review why you need the exact position in the first place. GeometryReader is trying to give as much as possible to its descendant. Now in iOS14. Returns a flexible preferred size to its parent layout. 8) } We’ve given SwiftUI enough information that it can automatically figure out the height: it knows the original width, it knows our target width, and it knows our content mode, so it understands how the target height of the image will Apr 13, 2023 · One of the most powerful features of SwiftUI is the GeometryReader, which provides a way to access the size and coordinate space of any view in the view hierarchy. Then i added the geometryreader and the VStack "collapses" like a ZStack. overlay(. func labelPercentage() -> String {. gray, count: 4) @State private var rect = [CGRect]() var columns: [GridItem] =. Mar 30, 2022 · The whole point of rotation is to be able to fit the label, so not sure how to get them to occupy the available space after rotation. VStack(alignment: . frame(. So as far as I can tell, it's an issue where the given value can be negative. It will therefore read the geometry of the view it returns. What the GeometryReader does is find the frame of the available space, and it fills it. size of the parent // You also have function to get the bounds // of the parent: geometry. Apr 24, 2021 · I would like to get the frame of a view in a LazyVStack. global) } } ) } GeometryReader has changed the way it displays its contents. If you want detailed information about your view’s size and position, you should use the GeometryReader view. Feb 20, 2021 · 2. // You also have function to get the Nov 12, 2020 · Instead of use internal GeometryReader that confuses external ScrollView, pass width from top GeometryReader into sub-views grids. A proxy for access to the size and coordinate space of the container view. Button("Go to next") {. cornerRadius(60) static var previews: some View {. When we use the frame(in:) method of a GeometryProxy, SwiftUI will calculate the view’s current position in the coordinate space we ask for. ScrollViewReader { value in. "Invalid frame dimension (negative or non-finite). Dec 21, 2023 · I'm afraid that I couldn't fully understand your idea, however, trying to set the frame size through GeometryReader is a bit strange. So, this: ScrollView { GeometryReader {r in Text("SomeText"). Two image views have 10 points space. Oct 18, 2019 · In my SwiftUI application, I have a VStack (VStack 1) container that get full screen height. Here's my code: import SwiftUI struct ContentView: View { // Initialise to a size proportional to the screen dimensions. GeometryReader is a powerful tool in SwiftUI that allows us to access and manipulate the size and position of a view. {. width - padding) there's no guarantee that p. frame(width: r. @State private var textHeight = CGFloat(0) private func firstContentView(geometry: GeometryProxy) -> some View {. This of course doesn't trigger onAppear, so the frames don't match anymore. y The y-coordinate at which to place the center of this view. Here is that concept, isolated: The problem is not from GeometryReader by itself but the intersection method: Feb 21, 2024 · Although the code is only a little shorter, this is a much neater solution than using GeometryReader because we no longer need to add a second frame() modifier to stop things taking up the full screen – this scroll view can fit alongside other parts of our SwiftUI layout without screwing things up. onAppear { self. SwiftUI GeometryReader view can also be used to create custom layouts that would be difficult or impossible to achieve using other methods. DispatchQueue. Tested with Xcode 12. A good visual aid for this is to drop . If you want to get the size of the two rectangles, you schoul put the geometry reader in the Stack of the rectangle and the text. Mar 18, 2023 · Mar 18, 2023 at 16:08. size. width, height: geometry. That will achieve the desired affect. GeometryReader takes up all available space. Parameters x The x-coordinate at which to place the center of this view. Jul 15, 2021 · UPDATE I was able to get something closer to what I'm trying to achieve. ( I assume because of the dynamic sizing. frame (in: . frame(width Jun 24, 2019 · GeometryReader is a view that gives you access to the size and position of its parent. foregroundColor(. it depends of your entire layout but you can try to fix vertical size of block, like. ("Hello World"). Nov 8, 2023 · GeometryReader breaks the concept of SwiftUI’s declarative programming, requiring direct operation of the view framework, which is closer to imperative programming. In this case the entire screen. width) Dec 12, 2020 · I want to drag across rectangles in a grid and change their color. main. Feb 28, 2020 · Spacer() . , your ZStack frame ()), then it occupies the whole screen. So you fix first text field and let second one consume all remaining space dynamically. You can assign a frame to the orange button and align it to bottomTrailing: 用法：. Returns A view that fixes the center of this view at x and y. resizable() . swift. Regularly there is a way of avoiding the geometry reader in such situations. Although it’s usually best to let SwiftUI perform automatic layout using stacks, it’s also possible to give our views sizes relative to their containers using GeometryReader. Workaround: Using offset() in the inner view, or a flexible container inside the GeometryReader with the right alignment. sizeUsingFont(usingFont: UIFont. width will be less than padding. padding(. Value : This function allows for logic to reduce all those preferences to a single value, if multiple values are outputted by multiple different views, all using the same PreferenceKey. height / 7) . For instace: @State var width: CGFloat = 0. The job of geometry proxy is to provide you with the frame in a certain coordinate space (talked in detail in upcoming Sep 22, 2020 · GeometryReader is just designed in a way that it takes as much space as it can. async {. bounds`, even if you used explicit frame within SwiftUI and used GeometryReader to pass the `CGSize` yourself to this UIViewController! Jul 26, 2023 · Jul 26, 2023 at 8:57. frame modifier in wrong place (placement of modifier is important) Here is modified code (assuming I understood your intention) GeometryReader { geo in. // which contains geometry. frame(maxWidth: . fixedSize() modifier to your HStack. scaledToFit() . fixedSize() works in that example, and attaching fixedSize(horizontal:vertical:) to my GeometryReader worked in the View I was actually working on (had nested ZStack s). frame(reader. Nov 24, 2023 · The big change I would suggest is not to use offset for layout. var body: some View {. width > 100 { // display Apr 16, 2022 · I understand that the centre of a SwiftUI view is considered its origin, and that's probably what's causing this behaviour. Here is what I know: The performance problems only started after I added a parent GeometryReader and a child Geometry Reader. Feb 4, 2020 · GeometryReader is a container view that defines its content as a function of its own size and coordinate space. . global) } } } May 1, 2020 · Working with GeometryReader. SwiftUI views are for the most part self sizing. The custom view contains two image views, aligning left and right respectively. To get the normal behavior, I usually just add . Text("Section 1") GridView(columns: 2, items: [1, 3, 5, 7, 9, 11, 13, 15]) { num in. I have tried putting the Geometry reader outside and inside the scroll view, but when I try and apply a . clear . You just need to use it in different way (so not affect external layout). It sets up a ContentView with a : Feb 23, 2024 · GeometryReader in SwiftUI by definition is a container view that provides access to the size and coordinate space of its view. Text("-44:44:44") . Apr 10, 2021 · SwiftUIにおいて、Global座標、Local座標というところに着目して、その値の取得方法やViewの配置方法と、親子それぞれでオフセットを変更した場合に、どのように座標の値が変化するのかを簡単に整理したいと思います。 Dec 8, 2019 · Viewサイズをどうやって知る？ UIKitではView自身の座標位置やサイズはUIViewのプロパティとしてframeプロパティやboundsプロパティが定義されそれで取得ができました。 SwiftUIのViewには座標位置やサイズを表すプロパティはありません。 ではそれらの情報を取りたいときにはどうすればいいの Jun 29, 2021 · しかし GeometryReader のハンドラー内は @ViewBuilder の記法が適応されているので、一文ずつViewプロトコルに適合したインスタンスを返す必要があります。. center) { GeometryReader { geo in Text("Hello, World!") . Usually that is not what you want. <n) { number in YourView() . var body: some View { GeometryReader { proxy in if proxy. Each image view has the same width and height (aspect ratio = 1). Because the content is dynamically sized I am not able to use a GeometryReader Proxy. width * 4/9, height: geo. For the purpose of this question, I created the following project : GeometryReaderTesting . 6. 85, idealHeight: geometry. Feb 6, 2022 · GeometryReader in SwiftUI. RegisterButtonView() However, the whole button view contains the extra space introduced by the GeometryReader, so that when I put this view to a root view, the space cannot be eliminated. frame(in: . Here is a solution that do not break layout. 0 var body: some View { GeometryReader { proxy in Text("Test") . buttonFrames[number] = geometry. struct Entry: Identifiable {. frame(width: geo. Feb 21, 2024 · ScrollView effects using GeometryReader. GeometryReader { geometry in HStack(spacing: 20) {. – user14119170. g. It can be used to create layout that adapts to changes in the parent view’s size and position. In the first question, the thread issue makes sense because given the code . 父view提供一个 Aug 2, 2019 · I have a SwiftUI view displaying an UIImage. Mar 13, 2023 · As @loremipsum mentioned in the comments, if you want this UI to scale for any screen size, then your lineWidth needs to be a percentage. var color: Color. Still needs work. Aug 1, 2019 · GeometryReader goes on to offer its full size to the next view down, which in this case is the frame modifier of type _ModifiedContent<Color, _FrameLayout>. global)：bounds of the parent} A GeometryReader is configured with a ViewBuilder (just like any other container view), but unlike other containers, the view builder for a geometry reader receives a parameter: the GeometryProxy. SwiftUI GeometryReader Layouts. Aug 20, 2019 · You need to create a state variable to store the width, then surround the desired view with a GeometryReader, and set the width value to the geometry inside that width. "Content View" of ScrollView is bigger than screen size, to allow spring effect at the edges, when one scrolls more than a scrolling document size. Any hints? let data = (03) @State private var colors: [Color] = Array(repeating: Color. Unfortunately I have a tab bar at the bottom to navigate between various views and that throws it off. font(. GeometryReader { geo in. background(skyBlue) . modifier width: geometry. GeometryReader { geometry in// geometry. red) } . 0, contents are aligned with the top leading corner. For example, with an image 3024 x 4032, and code: Aug 20, 2021 · Then, change your GeometryReader 's frame height value to the previously defined variable's value: GeometryReader { proxy in. bounds & using that to determine the ratio of the device's height to the master height, then using that multiplied by the master width to set a frame on the GeometryReader. The proxy has a Jun 10, 2019 · 18. frame(height: finalHeight) Finally (this is where the "magic" happens), in your drawCircles function, update the finalHeight variable as you load circles into your view. HStack() {. But there should be some parent view connection, so let's put the… Sep 26, 2020 · From documentation: Summary Fixes the center of the view at the specified coordinates in its parent’s coordinate space. system(size: geometry. You have obtained the size of the Text, then added . var value: Double. Jun 23, 2023 · The GeometryReader is a unique container that can hold multiple views. 00 // this variable stores the width we want to get. ) On a device with enough space, the ideal height will be used, on smaller devices the height will shrink but not to less than minHeight. let percentage = value * 100. Modifiers in SwiftUI do not actually modify views. Geometry readers should generally be avoided whenever possible. example) . yellow) Text("More text Nov 29, 2023 · When the size of the frame (parent view) changes, the size obtained by GeometryReader will also change accordingly. However, as the view moves those values will change, and SwiftUI will automatically make sure GeometryReader stays updated. Instead, use padding. Bug Report: FB7971927. My issue is that the state variable doesn't seem to be changing despite me setting it. struct SwiftUIView: View {. 03) Now if I wrap the body of my LoadingTitle in the GeometryReader I can get the correct relative size but then the GeometryReader expands my view vertically: var body: some View {. Weight. " I printed the size that the reader should give back and it looked fine. Aug 31, 2023 · import SwiftUI struct ContentView: View { @State private var containerHeight: Double = 0. " Like most everything in SwiftUI, GeometryReader is a view but with the added benefit of exposing additional information to its child views. horizontal) Jan 25, 2023 · The GeometryReader is a SwiftUI view that allows you to read the size and position of its parent view. I attempted to use a rounded rectangle for the mask but doesn't look good. 主要分3个步骤：. bold)) source i used: How to figure out the width of a string dynamically in SwiftUI. I think the 5000 rows are the main cause of your performance issues and lazy loading is probably the best way to resolve it. It seems that you were using a GeometryReader to define the position of the views based on a fraction of the total display height. It is especially useful when we need to create custom layouts or animations. So if you use it around your text view, it would take more or less the whole screen and put your text view in the center of it, and then return the proxy data for the enlarged frame – try it and see what happens. May 4, 2020 · Besides, GeometryReader is a SwiftUI block to read the dimensions from outer block, rather than getting dimensions from its children. background(Color. I'm having some serious performance problems. Apr 21, 2020 · We can use the GeometryReader inside the overlay on needed views and store necessary frames in an array or as separate variables. height. I did this so I could read the current value of the ScrollView. width > 180 { // display full row } else if proxy. clear) . Sep 30, 2021 · Stack Overflow Public questions & answers; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Talent Build your employer brand For people starting out with SwiftUI, it can be unexpected behavior, but the main thing is that every view in SwiftUI needs a specific size to render. But I guess your real question needs a different solution. Jan 5, 2023 · GeometryReader works by wrapping our view inside the view builder closer, it acts as a container. leading) {. title) . For example, if you wanted two views to take up half the available width on the screen, this wouldn’t be possible using hard-coded values GeometryReaderalways uses all available space. frame(height: containerHeight) } } This works. 7, height: 22, alignment: . As I was using a GeometryReader anyway I could simple set a fixed text size, using. frame ()). これではVoidを返す関数やメソッドが実行できません。. Mar 20, 2023 · In this example, we use a SwiftUI GeometryReader view to calculate the width of the parent view and divide it by three to create three evenly-spaced buttons. 3 point big frame - so the bigger the font the closer to the actual text size without the frame it gets. SwiftUI之GeometryReader. Aug 1, 2019 · In MyCardsListView I'm getting each Card's minimum X position using GeometryReader My goal is: while I'm scrolling the Cards in MyCardsListView , every ship model should rotate with respect to its Card's minimum X position (all of them shouldn't rotate with same rotation angle at the same time) Sep 1, 2020 · This is where GeometryReader comes into play. height * 0. Inside the closure, you can access a geometry proxy Jun 16, 2023 · Updated for Xcode 16. Paul Hudson @twostraws February 21st 2024. It looks like you placed . May 28, 2020 · I'm trying to use GeometryReader to assign a maxHeight to a list in a Scrollview. 試しに print 関数を実行してみましょう。. Frame modifier ignores the offered size and declares that its size is 50x50, and is then positioned in the center of the GeometryReader. The GeometryReader is a very important concept in SwiftUI because it allows you to create responsive and adaptive layouts that adapt to different Nov 28, 2023 · Setting View frame based on GeometryReader located inside that View in SwiftUI 1 SwiftUI ScrollView won't scroll when using fixedSize() to keep text from truncating Nov 1, 2023 · Let’s start simple and work our way up: make a new SwiftUI view called MissionView. As GeometryReader does not have content and no specific layout, it does what other views like Rectangle and Circle do, it fills up as much space as it can. Here is calculable relative layout solution based on GeometryReader (Note: using NSScreen is inappropriate in such case as might introduce expected layout on different models) Tested with Xcode 12b Feb 5, 2022 · 1. These two articles should give you a solid introduction: How to provide relative sizes using GeometryReader; Understanding frames and coordinates inside GeometryReader SwiftUI iOS14 GeometryReader Invalid frame dimension. Putting a GeometryReader in my LazyVStack breaks the layout. By accessing the Feb 22, 2024 · I'm working on an iOS app that supports both iPhone and iPads. width / 4. 9) to the CellView(), it stops the scrolling. // Your drawing code. Here is an example implementation: Understanding GeometryReader in SwiftUI. GeometryReader is mainly needed for reading dimensions. Oct 10, 2019 · In SwiftUI the view is just a function of the state if anything in the state changes the whole vie gets redrawn. By using the GeometryReader’s local coordinates, you can place different views on the user interface that can automatically adapt to different iOS screen sizes. Oct 12, 2020 · Because it would produce rendering cycle (changing state initiates refresh, which change state, and so on), and SwiftUI rendering engine is clever enough to drop such updates. ScrollView {. 1 / iOS 14. frame(height: geo. How can I determine the frame of the displayed View? I want to determine the color at the point on the image tapped by the user. I have created the following layout in SwiftUI. size：size of the paraent// geometry. Jul 16, 2019 · Looking through various posts here on StackOverflow, I think the solution is to use a GeometryReader like this: struct MyView: View {. Oct 20, 2020 · and use it like this: // calculate render width and height of text using provided font (without actually rendering) let sizeOfText: CGSize = "test string". You need to delay such update for next event loop, like. infinity). For example: Mar 23, 2022 · 2. The LazyVStack embedded in a ScrollView displays chat messages (Text and Images). width) GridView2(width: geo. struct ContentView: View { var body: some View { VStack(alignment: . So if the geometry changes the view will get redrawn automatically, just define the height of a view using geometry reader (if that is needed) and one of the modifiers and SwiftUI will do the work for you. Spacer() . Generally speaking, if you want to use Geometry of current main SwiftUI component which you are making (or the device screen, if it's a fullscreen component), then put GeometryReader at a parent level of other The GeometryReader is exact instrument to read views geometry, actually. task { containerHeight = calculateCustomHeight(using: proxy) } } . e. It is that wrapper view that we must think of as the “frame”. Frame modifier offers its full size (50x50) to its Jul 6, 2021 · GeometryReader's alignment keeps changing - see GeometryReader Discrepancies with Previous OS Versions. Instead, if you want to maintain some proportions and define frames, then consider creating view frames using UIScreen. With a ScrollView the actual height is 0. For example. This code is almost working, but this is not always the right rectangle that reacts: it behaves rather randomly. I will display different size images in the image view (scale aspect fill). 8, height: geometry. Apr 12, 2021 · GeometryReader { geometry in RoundedRect(cornerRadius: 5). The only work around I could find was this hacky solution - the edited part of the question near the bottom where the width reported by the geometry reader is captured through a workaround into a state variable and then re-used to set the frame size of a sibling view. GeometryReader consumes a lot of resources when updating geometric information, which may cause unnecessary repetitive calculations and view reconstruction. 7, height: 40) . 0. Feb 24, 2020 · var body: some View { GeometryReader { geometry in VStack { ImageContent() } . GeometryReader, if placed as you did, provides the size not of ScrollView itself, but of "Content View" in which image is placed. GeometryReader expands both horizontally and vertically, as Spacer does in VStack and HStack. Color. padding(), then put a . 5, contents were placed centered in the GeometryReader. Oct 2, 2019 · There’s a lot going on when we use modifiers (such as . On iOS 13. 5)) Nov 21, 2019 · 8. But, you don't actually need position or GeometryReader to do this. I used its GeometryProxy 's size to get the available width. Aug 24, 2022 · Using GeometryReader to get the views current position i then determine if it is on the screen or not and if so, depending on its position from left to right, increase the height accordingly. It is the perfect helper if we want to resize our view when a user switches from portrait to landscape mode (or vice-versa). 1. y turns negative, Oct 31, 2022 · What I am trying to do is to add in the use of GeometryReader so that each 'Page' would take up 90% of the screen. height) } } I think this issue pops up because GeometryReader's internal layout acts like a ZStack and it needs more information. I know the size of the raw image, but can't work out how to determine the actual size of the frame displayed. Just add the . For accessing the frame properties, you could just wrap the view around a geometry reader and use the geometry proxy in it. Initially this will just have a mission property so that we can show the mission badge and description, but shortly we’ll add more to it. var id: Int. 75 ). in device orientation or windows resizing on iPad. 85, minHeight: geometry. struct WelcomeView: View {. Jan 7, 2020 · The custom view width should be equal to the superview width. To use GeometryReader, you simply wrap your view in it. GeometryReader { geometry in. var body Jun 16, 2022 · In order to adapt its content my approach was the following: 1. I dont see you taking advantage of that geo property anywhere. VStack(spacing: 20) {. The app is still basically working, but looks a bit weird, because there is some padding introduced. . background ()` with different colors on everything, and then comment out Feb 7, 2024 · Your current code is behaving the way it is because position in SwiftUI positions the center of the View. // Here goes your view content, // and you can use the geometry variable. May 19, 2021 · Can someone explain why: GeometryReader positions its contents to the left top corner, not in the center. enum CoordinateSpace. When the view loads first time, the preference key will be updated from defaultValue to initial value. But I can't get the reader to fill the space. func coordinateSpace(NamedCoordinateSpace) -> some View. In order for us to see which direction content is scrolling we will use GeometryReader’s frame in global CoordinateSpace. For example: struct MyView: View { var body: some View { GeometryReader { geometry in // Here goes your view content, // and you can use the geometry variable // which contains geometry. I wrapped the view in a GeometryReader. Sep 5, 2019 · This is my advice, but if you really need to use two GeometryReader you have to do this way: struct ContentView2: View {. 2. overlay( GeometryReader { geometry in Color. systemFont(ofSize: 40, weight: UIFont. frame(width: p. I applied a little bit of math. With the text in your example, the solution would be to just remove the geometry reader. 3. SwiftUI的一个神奇之处在于，我们在做某些功能的时候，无需过多地关心布局信息，而是把主要精力放在业务逻辑部分，后续的文章中，我会专门写一篇Data Flow的文章。. textHeight = geometry. Any suggestions would be greatly Nov 11, 2020 · With regards to that, though, you can swap the position of the GeometryReader and the ScrollView. Circle() Rectangle() . width * 0. xp hb no ou it lp yc vf ke uk