├── Doc ├── hero-image.gif ├── xcode-setup.jpg └── preview-banner.jpg ├── PageViewSample ├── PageViewSample │ ├── Assets.xcassets │ │ ├── Contents.json │ │ ├── AccentColor.colorset │ │ │ └── Contents.json │ │ └── AppIcon.appiconset │ │ │ └── Contents.json │ ├── Preview Content │ │ └── Preview Assets.xcassets │ │ │ └── Contents.json │ ├── PageViewSample.entitlements │ ├── PageViewSampleApp.swift │ └── ContentView.swift └── PageViewSample.xcodeproj │ ├── project.xcworkspace │ ├── contents.xcworkspacedata │ ├── xcuserdata │ │ └── juniperphoton.xcuserdatad │ │ │ └── UserInterfaceState.xcuserstate │ └── xcshareddata │ │ ├── IDEWorkspaceChecks.plist │ │ └── swiftpm │ │ └── Package.resolved │ ├── xcuserdata │ └── juniperphoton.xcuserdatad │ │ └── xcschemes │ │ └── xcschememanagement.plist │ └── project.pbxproj ├── .swiftpm └── xcode │ └── xcuserdata │ └── juniperphoton.xcuserdatad │ └── xcschemes │ └── xcschememanagement.plist ├── LICENSE ├── Package.swift ├── README.md └── Sources └── PageView └── PageViewSwiftUI.swift /Doc/hero-image.gif: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/JuniperPhoton/PageView.SwiftUI/HEAD/Doc/hero-image.gif -------------------------------------------------------------------------------- /Doc/xcode-setup.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/JuniperPhoton/PageView.SwiftUI/HEAD/Doc/xcode-setup.jpg -------------------------------------------------------------------------------- /Doc/preview-banner.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/JuniperPhoton/PageView.SwiftUI/HEAD/Doc/preview-banner.jpg -------------------------------------------------------------------------------- /PageViewSample/PageViewSample/Assets.xcassets/Contents.json: -------------------------------------------------------------------------------- 1 | { 2 | "info" : { 3 | "author" : "xcode", 4 | "version" : 1 5 | } 6 | } 7 | -------------------------------------------------------------------------------- /PageViewSample/PageViewSample/Preview Content/Preview Assets.xcassets/Contents.json: -------------------------------------------------------------------------------- 1 | { 2 | "info" : { 3 | "author" : "xcode", 4 | "version" : 1 5 | } 6 | } 7 | -------------------------------------------------------------------------------- /PageViewSample/PageViewSample.xcodeproj/project.xcworkspace/contents.xcworkspacedata: -------------------------------------------------------------------------------- 1 | 2 | 4 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /PageViewSample/PageViewSample/Assets.xcassets/AccentColor.colorset/Contents.json: -------------------------------------------------------------------------------- 1 | { 2 | "colors" : [ 3 | { 4 | "idiom" : "universal" 5 | } 6 | ], 7 | "info" : { 8 | "author" : "xcode", 9 | "version" : 1 10 | } 11 | } 12 | -------------------------------------------------------------------------------- /PageViewSample/PageViewSample.xcodeproj/project.xcworkspace/xcuserdata/juniperphoton.xcuserdatad/UserInterfaceState.xcuserstate: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/JuniperPhoton/PageView.SwiftUI/HEAD/PageViewSample/PageViewSample.xcodeproj/project.xcworkspace/xcuserdata/juniperphoton.xcuserdatad/UserInterfaceState.xcuserstate -------------------------------------------------------------------------------- /PageViewSample/PageViewSample.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | IDEDidComputeMac32BitWarning 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /PageViewSample/PageViewSample.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved: -------------------------------------------------------------------------------- 1 | { 2 | "pins" : [ 3 | { 4 | "identity" : "nuke", 5 | "kind" : "remoteSourceControl", 6 | "location" : "https://github.com/kean/Nuke.git", 7 | "state" : { 8 | "revision" : "f67266f176af4add9f7a7020486826d82d562473", 9 | "version" : "12.1.2" 10 | } 11 | } 12 | ], 13 | "version" : 2 14 | } 15 | -------------------------------------------------------------------------------- /PageViewSample/PageViewSample/PageViewSample.entitlements: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | com.apple.security.app-sandbox 6 | 7 | com.apple.security.files.user-selected.read-only 8 | 9 | com.apple.security.network.client 10 | 11 | 12 | 13 | -------------------------------------------------------------------------------- /PageViewSample/PageViewSample/PageViewSampleApp.swift: -------------------------------------------------------------------------------- 1 | // 2 | // PageViewSampleApp.swift 3 | // PageViewSample 4 | // 5 | // Created by Photon Juniper on 2023/1/7. 6 | // 7 | 8 | import SwiftUI 9 | 10 | @main 11 | struct PageViewSampleApp: App { 12 | var body: some Scene { 13 | WindowGroup { 14 | PageViewSample() 15 | #if os(macOS) 16 | .frame(minWidth: 600, minHeight: 500) 17 | #endif 18 | } 19 | 20 | } 21 | } 22 | -------------------------------------------------------------------------------- /PageViewSample/PageViewSample.xcodeproj/xcuserdata/juniperphoton.xcuserdatad/xcschemes/xcschememanagement.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | SchemeUserState 6 | 7 | PageViewSample.xcscheme_^#shared#^_ 8 | 9 | orderHint 10 | 0 11 | 12 | 13 | 14 | 15 | -------------------------------------------------------------------------------- /.swiftpm/xcode/xcuserdata/juniperphoton.xcuserdatad/xcschemes/xcschememanagement.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | SchemeUserState 6 | 7 | PageView.SwiftUI-Package.xcscheme_^#shared#^_ 8 | 9 | orderHint 10 | 0 11 | 12 | PageView.xcscheme_^#shared#^_ 13 | 14 | orderHint 15 | 2 16 | 17 | 18 | SuppressBuildableAutocreation 19 | 20 | PageView.SwiftUI 21 | 22 | primary 23 | 24 | 25 | 26 | 27 | 28 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2023 JuniperPhoton 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /Package.swift: -------------------------------------------------------------------------------- 1 | // swift-tools-version: 5.7 2 | // The swift-tools-version declares the minimum version of Swift required to build this package. 3 | 4 | import PackageDescription 5 | 6 | let package = Package( 7 | name: "PageViewSwiftUI", 8 | platforms: [ 9 | .iOS(.v14), 10 | .macOS(.v11), 11 | .watchOS(.v8), 12 | .tvOS(.v15) 13 | ], 14 | products: [ 15 | // Products define the executables and libraries a package produces, and make them visible to other packages. 16 | .library( 17 | name: "PageView", 18 | targets: ["PageView"]), 19 | ], 20 | dependencies: [ 21 | // Dependencies declare other packages that this package depends on. 22 | // .package(url: /* package url */, from: "1.0.0"), 23 | ], 24 | targets: [ 25 | // Targets are the basic building blocks of a package. A target can define a module or a test suite. 26 | // Targets can depend on other targets in this package, and on products in packages this package depends on. 27 | .target( 28 | name: "PageView", 29 | dependencies: []) 30 | ] 31 | ) 32 | -------------------------------------------------------------------------------- /PageViewSample/PageViewSample/Assets.xcassets/AppIcon.appiconset/Contents.json: -------------------------------------------------------------------------------- 1 | { 2 | "images" : [ 3 | { 4 | "idiom" : "universal", 5 | "platform" : "ios", 6 | "size" : "1024x1024" 7 | }, 8 | { 9 | "idiom" : "mac", 10 | "scale" : "1x", 11 | "size" : "16x16" 12 | }, 13 | { 14 | "idiom" : "mac", 15 | "scale" : "2x", 16 | "size" : "16x16" 17 | }, 18 | { 19 | "idiom" : "mac", 20 | "scale" : "1x", 21 | "size" : "32x32" 22 | }, 23 | { 24 | "idiom" : "mac", 25 | "scale" : "2x", 26 | "size" : "32x32" 27 | }, 28 | { 29 | "idiom" : "mac", 30 | "scale" : "1x", 31 | "size" : "128x128" 32 | }, 33 | { 34 | "idiom" : "mac", 35 | "scale" : "2x", 36 | "size" : "128x128" 37 | }, 38 | { 39 | "idiom" : "mac", 40 | "scale" : "1x", 41 | "size" : "256x256" 42 | }, 43 | { 44 | "idiom" : "mac", 45 | "scale" : "2x", 46 | "size" : "256x256" 47 | }, 48 | { 49 | "idiom" : "mac", 50 | "scale" : "1x", 51 | "size" : "512x512" 52 | }, 53 | { 54 | "idiom" : "mac", 55 | "scale" : "2x", 56 | "size" : "512x512" 57 | } 58 | ], 59 | "info" : { 60 | "author" : "xcode", 61 | "version" : 1 62 | } 63 | } 64 | -------------------------------------------------------------------------------- /PageViewSample/PageViewSample/ContentView.swift: -------------------------------------------------------------------------------- 1 | // 2 | // ContentView.swift 3 | // PageViewSample 4 | // 5 | // Created by Photon Juniper on 2023/1/7. 6 | // 7 | 8 | import SwiftUI 9 | import PageView 10 | import NukeUI 11 | 12 | enum Page: String, Equatable, Identifiable, Hashable, CaseIterable { 13 | case new = "New" 14 | case featured = "Featured" 15 | case random = "Random" 16 | case search = "Search" 17 | 18 | var id: String { 19 | return self.rawValue 20 | } 21 | } 22 | 23 | enum Tabs: String, Hashable, CaseIterable { 24 | case new = "New" 25 | case downloaded = "Downloaded" 26 | case profile = "Profile" 27 | } 28 | 29 | struct PageViewSample: View { 30 | @State var selectedTab = Tabs.new 31 | 32 | var body: some View { 33 | BannerView() 34 | } 35 | } 36 | 37 | class Banner: Equatable, Identifiable, Hashable { 38 | static func == (lhs: Banner, rhs: Banner) -> Bool { 39 | return lhs.imageUrl == rhs.imageUrl 40 | } 41 | 42 | let imageUrl: String 43 | let name: String 44 | 45 | init(imageUrl: String, name: String) { 46 | self.imageUrl = imageUrl 47 | self.name = name 48 | } 49 | 50 | func hash(into hasher: inout Hasher) { 51 | hasher.combine(imageUrl) 52 | } 53 | } 54 | 55 | struct BannerView: View { 56 | @State var items: [Banner] = [ 57 | Banner(imageUrl: "https://images.unsplash.com/photo-1672824528354-784dea42edaa?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1675&q=80", name: "Snow land"), 58 | Banner(imageUrl: "https://images.unsplash.com/photo-1672207163711-d57124315946?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=2091&q=80", name: "Landscape"), 59 | Banner(imageUrl: "https://images.unsplash.com/photo-1667569700688-dca9fa7430a8?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=2054&q=80", name: "Island"), 60 | Banner(imageUrl: "https://images.unsplash.com/photo-1667298026326-bf93f52460e0?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1675&q=80", name: "Viliage"), 61 | Banner(imageUrl: "https://images.unsplash.com/photo-1662555320245-0c113fe1b87c?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=2832&q=80", name: "Road"), 62 | Banner(imageUrl: "https://images.unsplash.com/photo-1661256195466-abf9df7d3e2c?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=2178&q=80", name: "Morning"), 63 | ] 64 | 65 | @State var pageIndex: Int = 0 66 | 67 | @Namespace var namespace 68 | 69 | var body: some View { 70 | VStack(alignment: .leading) { 71 | HStack { 72 | Text("Gallery") 73 | .bold().font(.largeTitle) 74 | 75 | HStack(spacing: 0) { 76 | ZStack { 77 | Text("\(pageIndex + 1)") 78 | .tracking(4) 79 | .font(.title.bold()) 80 | .foregroundColor(Color.accentColor) 81 | .id(pageIndex) 82 | .transition(.move(edge: .bottom)) 83 | }.clipped() 84 | 85 | Text("/\(items.count)") 86 | .tracking(4) 87 | .font(.title.bold()) 88 | .foregroundColor(Color.accentColor) 89 | } 90 | 91 | }.padding() 92 | 93 | ZStack { 94 | PageView(items: items, 95 | pageIndex: $pageIndex, 96 | disablePaging: Binding.constant(false), spacing: 8) { item in 97 | ImageItemView(item: item) 98 | } 99 | 100 | indicatorView 101 | } 102 | .frame(maxWidth: .infinity) 103 | .padding(.vertical) 104 | }.frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .topLeading) 105 | } 106 | 107 | private var indicatorView: some View { 108 | HStack { 109 | ForEach(items, id: \.id) { item in 110 | Circle().fill(Color.white.opacity(0.3)) 111 | .frame(width: 12, height: 12) 112 | .background { 113 | if item == items[pageIndex] { 114 | Circle().fill(Color.white) 115 | .matchedGeometryEffect(id: "indicator", in: namespace) 116 | } 117 | } 118 | .onTapGesture { 119 | pageIndex = items.firstIndex(of: item)! 120 | } 121 | } 122 | }.frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .bottom) 123 | .padding() 124 | } 125 | } 126 | 127 | struct ImageItemView: View { 128 | let item: Banner 129 | 130 | var body: some View { 131 | GeometryReader { reader in 132 | ZStack { 133 | LazyImage(request: ImageRequest(stringLiteral: item.imageUrl)) { state in 134 | if state.isLoading { 135 | Rectangle().fill(Color.gray.opacity(0.5)) 136 | } else if let image = state.image { 137 | image.scaledToFill() 138 | .frame(width: reader.size.width, height: reader.size.height) 139 | } 140 | } 141 | .frame(width: reader.size.width, height: reader.size.height) 142 | .cornerRadius(12) 143 | .shadow(radius: 4) 144 | 145 | Text(item.name) 146 | .foregroundColor(Color.white) 147 | .font(.largeTitle.bold()) 148 | .padding() 149 | .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .topLeading) 150 | .shadow(radius: 4) 151 | } 152 | }.padding(.horizontal) 153 | } 154 | } 155 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # PageView.SwiftUI 2 | 3 | Screenshot 2023-02-05 at 23 13 55 4 | 5 | A container view that provides paging with virtualization/lazy loading feature, being implemented purely in `SwiftUI` using `HStack` and `DragGesture` internally. 6 | 7 | > Since it's a native view from SwiftUI, it supports iOS, iPadOS and macOS. 8 | 9 | PageView takes care of the views displaying in the screen, and will discard the views when they are offscreen, which is defined by ``offscreenCountPerSide``. 10 | 11 | Users can swipe horizontally to switch pages. You provides ``pageIndex`` binding to get or set the current page. 12 | 13 | To get more paging info such as paging progress, you pass the ``onPageTranslationChanged`` block and you will get noticed when paging translation changed. 14 | 15 | > NOTE: On iOS, iPadOS and tvOS, if you just need a container view as a navigating root view with swiping to switch pages, you can just use the official ``TabView`` with .page `TabViewStyle`. However, if you want to display a large amount of data, this ``PageView`` is for you since it has virtualization/lazy loading feature. 16 | 17 | > NOTE: `DragGesture` doesn't support Mac's TrackPad, so if you need to support swiping-to-scroll by TrackPad, you must use `NSPageController` to implement this. I make a `NSPageView` based on `NSPageController`, see https://github.com/JuniperPhoton/MyerLibApple/blob/main/Sources/MyerView/Mac/NSPageView.swift for more. 18 | 19 | ## Import using Swift Package 20 | 21 | ![](./Doc/xcode-setup.jpg) 22 | 23 | Add as package dependencies in your Xcode, like below. 24 | 25 | ``` 26 | https://github.com/JuniperPhoton/PageView.SwiftUI 27 | ``` 28 | 29 | Before using PageView, remember to import: 30 | 31 | ```swift 32 | import PageView 33 | ``` 34 | 35 | ## Example 36 | 37 | The first look: 38 | 39 | ```swift 40 | PageView(items: items, 41 | pageIndex: $pageIndex, 42 | disablePaging: Binding.constant(false), spacing: 8) { item in 43 | ZStack { 44 | AsyncImage(...) 45 | 46 | Text(...) 47 | } 48 | } 49 | ``` 50 | 51 | The example above achieves the following feature: 52 | 53 | ![](./Doc/preview-banner.jpg) 54 | 55 | The indicator uses the binding `pageIndex` to update itself: 56 | 57 | ```swift 58 | HStack { 59 | ForEach(items, id: \.id) { item in 60 | Circle().fill(Color.white) 61 | .opacity(items.firstIndex(of: item) == pageIndex ? 1.0 : 0.5) 62 | .frame(width: 12, height: 12) 63 | } 64 | }.frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .bottom) 65 | .padding() 66 | ``` 67 | 68 | ## Customization 69 | 70 | First please refer to the initializer of the ``PageView``. 71 | 72 | - Parameter `items`: items to be populated, should be a ``RandomAccessCollection`` 73 | - Parameter `pageIndex`: a binding to the current page index 74 | - Parameter `disablePaging`: a binding to disable the paging. Set this to true will disable the gesture, you can still set the ``pageIndex`` to navigate to the specified page 75 | - Parameter `offscreenCountPerSide`: effects how many Views will be on screen at the same time. The default value is 2, which makes ``1 + 2 * 2 = 5`` views. Your ``items`` could be as large as you want, and keep this ``offscreenCountPerSide`` small to help reduce your memory footage. 76 | - Parameter `spacing`: spacing between pages, horizontally. Note that the spacing won't be see until users start swiping 77 | - Parameter `scrollSlop`: how much pts the user swipe to navigate to the next page, default to 20pt 78 | - Parameter `animationDuration`: animation duration, default to 0.3 seconds 79 | - Parameter `onPageTranslationChanged`: when the user start swiping, this block will be invoked to provide information about paging translation. See ``PagingTranslation`` to know more. 80 | - Parameter `itemContent`: provides ``View`` given a ``C.Element`` you passed in the ``items`` 81 | 82 | ```swift 83 | public init(items: C, 84 | pageIndex: Binding, 85 | disablePaging: Binding, 86 | offscreenCountPerSide: Int = 2, 87 | spacing: CGFloat = 20, 88 | scrollSlop: CGFloat = 20, 89 | animationDuration: CGFloat = 0.3, 90 | onPageTranslationChanged: ((PagingTranslation) -> Void)? = nil, 91 | @ViewBuilder itemContent: @escaping (C.Element) -> Content) 92 | ``` 93 | 94 | The example of `onPageTranslationChanged` will output when swiping from `page0` to `page1`. You can use this progress to update your indicator progressively. 95 | 96 | ``` 97 | app current translation is 0 -> 1, Progress: 0.028837985361502068 98 | app current translation is 0 -> 1, Progress: 0.03816793893129771 99 | app current translation is 0 -> 1, Progress: 0.05173874872028069 100 | app current translation is 0 -> 1, Progress: 0.05597964376590331 101 | app current translation is 0 -> 1, Progress: 0.057675970723004136 102 | app current translation is 0 -> 1, Progress: 0.05937233650654024 103 | app current translation is 0 -> 1, Progress: 0.06446139503071327 104 | app current translation is 0 -> 1, Progress: 0.07803220481969625 105 | app current translation is 0 -> 1, Progress: 0.09499574617575143 106 | app current translation is 0 -> 1, Progress: 0.11535198027244355 107 | app current translation is 0 -> 1, Progress: 0.14079727289330868 108 | app current translation is 0 -> 1, Progress: 0.15521628498727735 109 | app current translation is 0 -> 1, Progress: 0.1798133753031568 110 | app current translation is 0 -> 1, Progress: 0.20610687022900764 111 | app current translation is 0 -> 1, Progress: 0.24173027989821882 112 | app current translation is 0 -> 1, Progress: 1.0 113 | ``` 114 | 115 | ## Example 116 | 117 | This repo includes an example, please navigate to [this](https://github.com/JuniperPhoton/PageView.SwiftUI/tree/main/PageViewSample) to know more. 118 | 119 | ## Limitations 120 | 121 | There are some limitations which are about to be resolved(perhaps we don't have enough API to do this): 122 | - Inside the ``PageView``, you can put a SwiftUI ``List`` and it works fine. But if you put a ``ScrollView`` with grids or stacks, ``PageView`` would take over the gesture and the ``ScrollView`` can't be scrolled. Currently SwiftUI can't handle the conflict of your custom gesture with other built-in views'. 123 | -------------------------------------------------------------------------------- /Sources/PageView/PageViewSwiftUI.swift: -------------------------------------------------------------------------------- 1 | import SwiftUI 2 | 3 | /// Provide information about paging. 4 | /// 5 | /// You use the ``currentIndex`` to get the current paging index. The ``currentIndex`` won't be updated until the swiping ends. 6 | /// You use the ``nextIndex`` to get the predicated next index. The framework guarantees that the ``nextIndex`` will be safe to use and won't cause out-of-bounds issues. 7 | /// In the LTR context, If the ``currentIndex`` is 0 and the user is swiping to the right, the ``nextIndex`` should be 0 too. 8 | /// 9 | /// You use the ``progress`` to get the swiping progress between pages. Useful when you building a indicator which follows the paging progress. 10 | public struct PagingTranslation: CustomStringConvertible, Equatable { 11 | let currentIndex: Int 12 | let nextIndex: Int 13 | let progress: CGFloat 14 | 15 | public init(currentIndex: Int, nextIndex: Int, progress: CGFloat) { 16 | self.currentIndex = currentIndex 17 | self.nextIndex = nextIndex 18 | self.progress = progress 19 | } 20 | 21 | public var description: String { 22 | return "\(currentIndex) -> \(nextIndex), Progress: \(progress)" 23 | } 24 | } 25 | 26 | /// A container view providing paging with virtualization feature. 27 | /// 28 | /// PageView takes care of the views displaying in the screen, and will discard the views offscreen(which is defined by ``offscreenCountPerSide``. 29 | /// 30 | /// Users can swipe horizontally to switch pages. You provides ``pageIndex`` binding to get or set the current page. 31 | /// To get more paging info like paging progress, you pass the ``onPageTranslationChanged`` block and you will get noticed when paging translation changed. 32 | /// 33 | /// See the initializer to know more customations. 34 | public struct PageView: View where Data: Equatable & Hashable, 35 | Data.Element: Identifiable & Equatable { 36 | let items: Data 37 | let itemContent: (Data.Element) -> Content 38 | let pageIndex: Binding 39 | 40 | let disablePaging: Binding 41 | 42 | var onPageTranslationChanged: ((PagingTranslation) -> Void)? = nil 43 | 44 | @GestureState var dragTranslationX: CGFloat = 0 45 | 46 | @State var translationX: CGFloat = 0 47 | @State var virtualPageIndex: CGFloat = 0 48 | 49 | @State var displayedItemId: Data.Element.ID? = nil { 50 | didSet { 51 | if let originalIndex = items.firstIndex(where: { v in 52 | v.id == displayedItemId 53 | }) as? Int { 54 | pageIndex.wrappedValue = originalIndex 55 | } 56 | } 57 | } 58 | 59 | @State var displayedItems: [Data.Element] = [] 60 | @State var width: CGFloat = 0.0 61 | 62 | private let offscreenCountPerSide: Int 63 | private let spacing: CGFloat 64 | private let scrollSlop: CGFloat 65 | private let animationDuration: CGFloat 66 | 67 | /// - Parameter items: items to be populated, should be a ``RandomAccessCollection`` 68 | /// - Parameter pageIndex: a binding to the current page index 69 | /// - Parameter disablePaging: a binding to disable the paging. Set this to true will disable the gesture, you can still set the ``pageIndex`` to navigate to the specified page 70 | /// - Parameter offscreenCountPerSide: effects how many Views will be on screen at the same time. The default value is 2, which makes ``1 + 2 * 2 = 5`` views. Your ``items`` could be as large as you want, and keep this ``offscreenCountPerSide`` small to help reduce your memory footage. 71 | /// - Parameter spacing: spacing between pages, horizontally. Note that the spacing won't be see until users start swiping 72 | /// - Parameter scrollSlop: how much pts the user swipe to navigate to the next page, default to 20pt 73 | /// - Parameter animationDuration: animation duration, default to 0.3 seconds 74 | /// - Parameter onPageTranslationChanged: when the user start swiping, this block will be invoked to provide information about paging translation. See ``PagingTranslation`` to know more. 75 | /// - Parameter itemContent: provides ``View`` given a ``Data.Element`` you passed in the ``items`` 76 | public init(items: Data, 77 | pageIndex: Binding, 78 | disablePaging: Binding = .constant(false), 79 | offscreenCountPerSide: Int = 2, 80 | spacing: CGFloat = 20, 81 | scrollSlop: CGFloat = 20, 82 | animationDuration: CGFloat = 0.3, 83 | onPageTranslationChanged: ((PagingTranslation) -> Void)? = nil, 84 | @ViewBuilder itemContent: @escaping (Data.Element) -> Content) { 85 | self.items = items 86 | self.itemContent = itemContent 87 | self.pageIndex = pageIndex 88 | self.disablePaging = disablePaging 89 | self.offscreenCountPerSide = offscreenCountPerSide 90 | self.spacing = spacing 91 | self.scrollSlop = scrollSlop 92 | self.animationDuration = animationDuration 93 | self.onPageTranslationChanged = onPageTranslationChanged 94 | } 95 | 96 | private func calculateDisplayItems(originalIndex: Int) { 97 | displayedItems.removeAll() 98 | 99 | var start = originalIndex - 1 100 | if start < 0 { 101 | start = 0 102 | } 103 | var end = start + offscreenCountPerSide * 2 104 | if end >= items.count { 105 | end = items.count - 1 106 | } 107 | for i in start...end { 108 | if let index = items.index(items.startIndex, offsetBy: i, limitedBy: items.endIndex) { 109 | displayedItems.append(items[index]) 110 | } 111 | } 112 | } 113 | 114 | public var body: some View { 115 | #if !os(tvOS) 116 | // Note that `minimumDistance` seems not work in real iPhone & iPad in iOS 16.2. 117 | // We use the default value of `minimumDistance` to prevent gesture conflict. 118 | let gesture = DragGesture(coordinateSpace: .global) 119 | .onEnded { value in 120 | onGestureEnd(value: value) 121 | } 122 | .updating($dragTranslationX) { v, state, _ in 123 | state = v.translation.width 124 | } 125 | #endif 126 | 127 | GeometryReader { proxy in 128 | HStack(spacing: spacing) { 129 | ForEach(displayedItems, id: \.id) { item in 130 | itemContent(item) 131 | .frame(width: proxy.size.width, height: proxy.size.height) 132 | } 133 | } 134 | .frame(maxWidth: .infinity, maxHeight: .infinity) 135 | .offset(x: (-CGFloat(virtualPageIndex) * (proxy.size.width + spacing)) + translationX) 136 | } 137 | .contentShape(Rectangle()) 138 | #if !os(tvOS) 139 | .simultaneousGesture(gesture, including: disablePaging.wrappedValue ? .subviews : .all) 140 | #endif 141 | .onAppear { 142 | calculateDisplayItems(originalIndex: pageIndex.wrappedValue) 143 | updateVirtualPageIndex(originalIndex: pageIndex.wrappedValue) 144 | } 145 | .onChange(of: dragTranslationX) { newValue in 146 | translationX = newValue 147 | 148 | let progress: CGFloat = abs(translationX) / self.width 149 | if progress == 0 { 150 | return 151 | } 152 | 153 | let currentIndex = pageIndex.wrappedValue 154 | var nextIndex = translationX < 0 ? currentIndex + 1 : currentIndex - 1 155 | nextIndex = nextIndex.clamp(to: 0...items.count - 1) 156 | 157 | let translation = PagingTranslation(currentIndex: currentIndex, 158 | nextIndex: nextIndex, progress: progress) 159 | self.onPageTranslationChanged?(translation) 160 | } 161 | .onChange(of: pageIndex.wrappedValue, perform: { newValue in 162 | withEastOutAnimation(duration: animationDuration) { 163 | calculateDisplayItems(originalIndex: newValue) 164 | updateVirtualPageIndex(originalIndex: newValue) 165 | } 166 | }) 167 | .listenWidthChanged { width in 168 | self.width = width 169 | } 170 | .id(items) 171 | } 172 | 173 | #if !os(tvOS) 174 | private func onGestureEnd(value: DragGesture.Value) { 175 | withEastOutAnimation(duration: animationDuration) { 176 | var newVirtualIndex = virtualPageIndex 177 | if translationX > scrollSlop { 178 | var index = virtualPageIndex - 1 179 | if index < 0 { 180 | index = 0 181 | } 182 | newVirtualIndex = index 183 | } else if translationX < -scrollSlop { 184 | var index = virtualPageIndex + 1 185 | if index >= CGFloat(displayedItems.count) { 186 | index = CGFloat(displayedItems.count) - 1 187 | } 188 | newVirtualIndex = index 189 | } 190 | 191 | self.virtualPageIndex = newVirtualIndex 192 | self.translationX = 0 193 | 194 | let currentItem = displayedItems[Int(self.virtualPageIndex)] 195 | let nextOriginalIndex = items.firstIndex { id in 196 | id == currentItem 197 | } as! Int 198 | 199 | let translation = PagingTranslation(currentIndex: pageIndex.wrappedValue, 200 | nextIndex: nextOriginalIndex, progress: 1.0) 201 | 202 | self.onPageTranslationChanged?(translation) 203 | 204 | // TODO Use new withAnimation API in iOS 17/macOS 14 to get the exact moment when the animation ends. 205 | DispatchQueue.main.asyncAfter(deadline: .now() + animationDuration) { 206 | withEastOutAnimation(duration: animationDuration) { 207 | calculateDisplayItems(originalIndex: nextOriginalIndex) 208 | updateVirtualPageIndex(originalIndex: nextOriginalIndex) 209 | } 210 | } 211 | } 212 | } 213 | #endif 214 | 215 | private func updateVirtualPageIndex(originalIndex: Int) { 216 | if originalIndex != 0 && originalIndex != items.count - 1 { 217 | virtualPageIndex = 1 218 | } else if originalIndex == 0 { 219 | virtualPageIndex = 0 220 | } else if originalIndex == items.count - 1 { 221 | virtualPageIndex = CGFloat(displayedItems.count) - 1 222 | } 223 | 224 | displayedItemId = displayedItems[Int(virtualPageIndex)].id 225 | } 226 | } 227 | 228 | fileprivate func withEastOutAnimation(duration: Double = 0.3, 229 | _ delay: Double = 0.0, 230 | _ body: () throws -> Result) -> Result? { 231 | return try? withAnimation(Animation.easeOut(duration: duration).delay(delay)) { 232 | try body() 233 | } 234 | } 235 | 236 | fileprivate extension View { 237 | /// Listen the width changed of this view. 238 | /// - Parameter onWidthChanged: invoked on width changed 239 | func listenWidthChanged(onWidthChanged: @escaping (CGFloat) -> Void) -> some View { 240 | self.overlay(GeometryReader(content: { proxy in 241 | Color.clear.onChange(of: proxy.size.width) { newValue in 242 | onWidthChanged(newValue) 243 | }.onAppear { 244 | onWidthChanged(proxy.size.width) 245 | } 246 | })) 247 | } 248 | } 249 | 250 | fileprivate extension Comparable { 251 | func clamp(to range: ClosedRange) -> Self { 252 | if self < range.lowerBound { 253 | return range.lowerBound 254 | } 255 | if self > range.upperBound { 256 | return range.upperBound 257 | } 258 | return self 259 | } 260 | } 261 | -------------------------------------------------------------------------------- /PageViewSample/PageViewSample.xcodeproj/project.pbxproj: -------------------------------------------------------------------------------- 1 | // !$*UTF8*$! 2 | { 3 | archiveVersion = 1; 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374 | }; 375 | 22F6ED0A2969A146002D0A16 /* Build configuration list for PBXNativeTarget "PageViewSample" */ = { 376 | isa = XCConfigurationList; 377 | buildConfigurations = ( 378 | 22F6ED0B2969A146002D0A16 /* Debug */, 379 | 22F6ED0C2969A146002D0A16 /* Release */, 380 | ); 381 | defaultConfigurationIsVisible = 0; 382 | defaultConfigurationName = Release; 383 | }; 384 | /* End XCConfigurationList section */ 385 | 386 | /* Begin XCRemoteSwiftPackageReference section */ 387 | 224EF17B2A4BF5CE00035CA4 /* XCRemoteSwiftPackageReference "Nuke" */ = { 388 | isa = XCRemoteSwiftPackageReference; 389 | repositoryURL = "https://github.com/kean/Nuke"; 390 | requirement = { 391 | kind = upToNextMajorVersion; 392 | minimumVersion = 12.0.0; 393 | }; 394 | }; 395 | 22F6ED112969A2CA002D0A16 /* XCRemoteSwiftPackageReference "PageView" */ = { 396 | isa = XCRemoteSwiftPackageReference; 397 | repositoryURL = "https://github.com/JuniperPhoton/PageView.SwiftUI"; 398 | requirement = { 399 | branch = main; 400 | kind = branch; 401 | }; 402 | }; 403 | /* End XCRemoteSwiftPackageReference section */ 404 | 405 | /* Begin XCSwiftPackageProductDependency section */ 406 | 224EF17C2A4BF5CE00035CA4 /* Nuke */ = { 407 | isa = XCSwiftPackageProductDependency; 408 | package = 224EF17B2A4BF5CE00035CA4 /* XCRemoteSwiftPackageReference "Nuke" */; 409 | productName = Nuke; 410 | }; 411 | 224EF17E2A4BF5CE00035CA4 /* NukeExtensions */ = { 412 | isa = XCSwiftPackageProductDependency; 413 | package = 224EF17B2A4BF5CE00035CA4 /* XCRemoteSwiftPackageReference "Nuke" */; 414 | productName = NukeExtensions; 415 | }; 416 | 224EF1802A4BF5CE00035CA4 /* NukeUI */ = { 417 | isa = XCSwiftPackageProductDependency; 418 | package = 224EF17B2A4BF5CE00035CA4 /* XCRemoteSwiftPackageReference "Nuke" */; 419 | productName = NukeUI; 420 | }; 421 | 22F6ED122969A2CA002D0A16 /* PageView */ = { 422 | isa = XCSwiftPackageProductDependency; 423 | package = 22F6ED112969A2CA002D0A16 /* XCRemoteSwiftPackageReference "PageView" */; 424 | productName = PageView; 425 | }; 426 | /* End XCSwiftPackageProductDependency section */ 427 | }; 428 | rootObject = 22F6ECF32969A145002D0A16 /* Project object */; 429 | } 430 | --------------------------------------------------------------------------------