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How to rotate a view

Paul Hudson    @twostraws   

Fully updated for Xcode 11.2

SwiftUI’s rotationEffect() modifier lets us rotate views freely, using either degrees or radians.

For example, if you wanted to rotate some text by -90 degrees so that it reads upwards, you would use this:

Text("Up we go")
    .rotationEffect(.degrees(-90))

If you prefer using radians, just pass in .radians() as your parameter, like this:

Text("Up we go")
    .rotationEffect(.radians(.pi))

View rotation is so fast that it’s effectively free, so you could even make it interactive using a slider if you wanted:

struct ContentView: View {
    @State private var rotation = 0.0

    var body: some View {
        VStack {
            Slider(value: $rotation, in: 0...360, step: 1.0)
            Text("Up we go")
                .rotationEffect(.degrees(rotation))
        }
    }
}

By default views rotate around their center, but if you want to pin the rotation from a particular point you can add an extra parameter for that. For example if you wanted to make the slider above pivoting the rotation around the view’s top-left corner you’d write this:

struct ContentView: View {
    @State private var rotation = 0.0

    var body: some View {
        VStack {
            Slider(value: $rotation, in: 0...360, step: 1.0)
            Text("Up we go")
                .rotationEffect(.degrees(rotation), anchor: .topLeading)
        }
    }
}

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