#Tabview background color swiftui how to

Path.addArc(center: CGPoint(x: bl, y: h - bl), radius: bl, startAngle: Angle(degrees: 90), endAngle: Angle(degrees: 180), clockwise: false) Path.addArc(center: CGPoint(x: w - br, y: h - br), radius: br, startAngle: Angle(degrees: 0), endAngle: Angle(degrees: 90), clockwise: false) Path.addLine(to: CGPoint(x: w, y: h - br)) Path.addArc(center: CGPoint(x: w - tr, y: tr), radius: tr, startAngle: Angle(degrees: -90), endAngle: Angle(degrees: 0), clockwise: false) Path.addLine(to: CGPoint(x: w - tr, y: 0)) We make sure the radius does not exceed the bounds dimensions Var br: CGFloat = 0.0 // bottom-right radius parameter Var bl: CGFloat = 0.0 // bottom-left radius parameter Var tr: CGFloat = 0.0 // top-right radius parameter Var tl: CGFloat = 0.0 // top-left radius parameter The implementation would look like this: struct ContentView : View. Let’s create a view that draws a rectangular background, with the possibility of specifying a different radius to each corner: To illustrate how we can take advantage of that, we will combine it with GeometryReader. You probably already figure out that you can provide any view to. overlay modifier does exactly the same, but instead of drawing its contents behind the modified view, it draws them in front of it. Because its parent is background, and background modifies Text, the area suggested to Color.red is the area occupied by the view Text('hello'). No, Color.red is yet another view! Its only function is to fill the area suggested by its parent with the red color. At first glance we may fail to realise that, Color.red, is not just a parameter indicating that the color should be red. For example: Text('hello').background(Color.red). In most tutorials I have seen, background is used in its simplest form. overlay() modifier, it can be even more powerful. GeometryReader is very powerful, but if used in combination with the.

Powerful, isn’t it? Make sure you come back to learn more about it.

For now, you should know that using that subscript, you can get the size and position of any subview down the view tree. It is a fascinating feature of the GeometryReader but it is also a heavy topic, which I explain in the second part of Inspecting the View Tree. Check Inspecting the View Tree, where there is one that uses it.įinally, we have a subscript getter with a weird Anchor type.

#Tabview background color swiftui how to

The best way to learn how to use them, is by example. Named coordinate spaces, however, let a view name its own coordinate space which can later be references by other views. The frame function let us obtain a rect of the suggested area, using different coordinate spaces. The safeAreaInsets are also exposed through the GeometryProxy. But remember, that is up to us, the children. As seen in the example, size is a property that contains the size suggested by the parent. Now that we have GeometryReader, it is very simple: Almost everything is a view with SwiftUI! As you will see in the example below, GeometryReader lets YOU define its contents, but unlike other views, you also have access to some useful information you can seize to do your thing in the process.Ĭonsider the exercise we mentioned before: Make a view that draws a rectangle with half the size of the parent’s suggestion and positions it 5 points to the right side of the suggested area. Let’s begin by actually looking to the documentation Apple provides about GeometryReader:Ī container view that defines its content as a function of its own size and coordinate space.Ĭomparing to other entries that only say “No overview available”, we can consider ourselves lucky!īut what does this mean anyway? Well basically, GeometryReader is yet another view! Surprised? I guess you’re not by now. Here is where GeometryReader comes to the rescue. So how do we go off script here? It turns out, is not that complicated. If the child view is not happy with what its was offered, then he can just ignore it.įor example, if you want your custom view to draw a rectangle with half the size of the one suggested by your parent, and if you want to positioned it 5 points to the right edge of the suggested location, then so be it. However, as explained on session 237, parents suggest a size and position, but it is up to the child view to decide where and how to draw itself. If you would like to learn more about how parents determine size and position for their children, I strongly suggest you watch the 2019 WWDC session 237 ( Building Custom Views with SwiftUI). In this case, the containing VStack is such parent. Let SwiftUI figure out where and how big the parent wants it. As you can see, the view MyRectangle() does not worry about size.