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PagerView in SwiftUI
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// | |
// PagerView.swift | |
// | |
// Created by Majid Jabrayilov on 12/5/19. | |
// Copyright © 2019 Majid Jabrayilov. All rights reserved. | |
// | |
import SwiftUI | |
struct PagerView<Content: View>: View { | |
let pageCount: Int | |
@Binding var currentIndex: Int | |
let content: Content | |
@GestureState private var translation: CGFloat = 0 | |
init(pageCount: Int, currentIndex: Binding<Int>, @ViewBuilder content: () -> Content) { | |
self.pageCount = pageCount | |
self._currentIndex = currentIndex | |
self.content = content() | |
} | |
var body: some View { | |
GeometryReader { geometry in | |
HStack(spacing: 0) { | |
self.content.frame(width: geometry.size.width) | |
} | |
.frame(width: geometry.size.width, alignment: .leading) | |
.offset(x: -CGFloat(self.currentIndex) * geometry.size.width) | |
.offset(x: self.translation) | |
.animation(.interactiveSpring()) | |
.gesture( | |
DragGesture().updating(self.$translation) { value, state, _ in | |
state = value.translation.width | |
}.onEnded { value in | |
let offset = value.translation.width / geometry.size.width | |
let newIndex = (CGFloat(self.currentIndex) - offset).rounded() | |
self.currentIndex = min(max(Int(newIndex), 0), self.pageCount - 1) | |
} | |
) | |
} | |
} | |
} |
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