How to make tab view in SwiftUI

Issue #614

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struct MyTabView: View {
@EnvironmentObject
var preferenceManager: PreferenceManager

var body: some View {
VOrH(isVertical: preferenceManager.preference.position.isVertical) {
OneTabView(image: "one", text: "One", tab: .one)
OneTabView(image: "two", text: "Two", tab: .two)
OneTabView(image: "three", text: "Three", tab: .three)
Spacer()
}
}
}

struct OneTabView: View {
@EnvironmentObject
var preferenceManager: PreferenceManager

let image: String
let text: String
let tab: Tab

var selected: Bool {
preferenceManager.preference.tab == tab
}

var body: some View {
Button(action: { self.preferenceManager.preference.tab = self.tab }) {
VStack(spacing: 2) {
Image(image)
.renderingMode(selected ? .original : .template)
.resizable()
.aspectRatio(contentMode: .fit)
.frame(height: 20)
Text(text)
.font(.system(.caption, design: .rounded))
.fontWeight(selected ? .semibold : .none)
}
}
.padding(.horizontal, 4)
.buttonStyle(BorderlessButtonStyle())
.frame(width: 60, height: 50)
.background(selected ? R.color.selectedTabBackground : Color.clear)
.cornerRadius(4)
}
}
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