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Forked from mecid/PagerView.swift
Created December 26, 2019 21:58
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PagerView in SwiftUI
//
// 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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