SwiftUI Rotation Gesture Tutorial

The Rotation gesture uses can be used to rotate an object .In this tutorial an image is displayed which can be rotated using this gesture..SwiftUI requires Xcode 11 and MacOS Catalina, which can be download at the Apple developer portal.

Open Xcode and either click Create a new Xcode project in Xcode’s startup window, or choose File > New > Project . In the template selector, select iOS as the platform, select the Single View App template, and then click Next . Enter SwiftUIRotateGestureTutorial as the Product Name, select the Use SwiftUI checkbox, and click Next . Choose a location to save the project on your Mac.

Download theimage, open the Assets library and drag the image to it.

Go to the ContentView. In the canvas, click Resume to display the preview. If the canvas isn’t visible, select Editor > Editor and Canvas to show it.

In the Project navigator, click to select ContentView.swift . Change the code inside the ContentView struct to

struct ContentView: View {
    // 1.
    @State private var rotateState: Double = 0
    
    var body: some View {
        // 2.
        Image("apple_swift_logo")
            // 3.
            .rotationEffect(Angle(degrees: self.rotateState))
            // 4.
            .gesture(RotationGesture()
                .onChanged { value in
                    self.rotateState = value.degrees
                }
            )
    }
}

The source code of the SwiftUIRotateGestureTutorial can be downloaded at the ioscreator repository on Github .