如何从 SwiftUI 调用 PHPhotoLibrary presentLimitedLibraryPicker?
How to call PHPhotoLibrary presentLimitedLibraryPicker from SwiftUI?
从 SwiftUI 调用 PHPhotoLibrary 的 presentLimitedLibraryPicker 方法的正确方法是什么?
该方法需要一个 UIViewController,我在 SwiftUI 中没有。
我尝试使用 UIViewControllerRepresentable 来创建一个 UIViewController,它确实有效,但结果是出现了两个视图控制器,我用 UI 创建的那个ViewController可代表的,和有限的图书馆选择器。
两个视图控制器都需要关闭才能到达原始屏幕,这是不可取的。
总结一下我看到的问题:
- presentLimitedLibraryPicker 通过传递 ViewController.
来工作
- 这让我创建并呈现一个虚拟对象 ViewController,这样我就可以调用该方法。
- 无法获取对有限库选择器的引用,它也不提供委托。所以我无法检测到 Limited Library Picker 控制器何时被关闭。
这是我的尝试(它显示了选择器,但是当你关闭它时,你也需要关闭额外的虚拟视图控制器:
import Foundation
import SwiftUI
import Photos
import PhotosUI
struct TestView: View {
@State var showLibraryPicker = false
var body: some View {
NavigationView {
VStack {
Button("Open Library Picker") { showLibraryPicker = true }
}
.navigationBarTitle("Test", displayMode: .inline)
.navigationViewStyle(StackNavigationViewStyle())
.sheet(isPresented: $showLibraryPicker, onDismiss: { print("Dismissed") }) {
TestLimitedLibraryPicker()
}
}
}
}
struct TestLimitedLibraryPicker: UIViewControllerRepresentable {
func makeUIViewController(context: Context) -> UIViewController {
let controller = UIViewController()
PHPhotoLibrary.shared().presentLimitedLibraryPicker(from: controller)
return controller
}
func updateUIViewController(_ uiViewController: UIViewController, context: Context) {
}
}
下面是一些演示方法。使用 Xcode 12 / iOS 14.
准备和测试
struct TestPhotosView: View {
@State var showLibraryPicker = false
var body: some View {
NavigationView {
VStack {
Button("Open Library Picker") { self.showLibraryPicker = true }
}
.navigationBarTitle("Test", displayMode: .inline)
.navigationViewStyle(StackNavigationViewStyle())
.background(Group {
if self.showLibraryPicker {
TestLimitedLibraryPicker(isPresented: $showLibraryPicker)
}
})
}
}
}
struct TestLimitedLibraryPicker: UIViewControllerRepresentable {
@Binding var isPresented: Bool
func makeUIViewController(context: Context) -> UIViewController {
let controller = UIViewController()
DispatchQueue.main.async {
PHPhotoLibrary.requestAuthorization() { result in
PHPhotoLibrary.shared().presentLimitedLibraryPicker(from: controller)
context.coordinator.trackCompletion(in: controller)
}
}
return controller
}
func updateUIViewController(_ uiViewController: UIViewController, context: Context) {}
func makeCoordinator() -> Coordinator {
Coordinator(isPresented: $isPresented)
}
class Coordinator: NSObject {
private var isPresented: Binding<Bool>
init(isPresented: Binding<Bool>) {
self.isPresented = isPresented
}
func trackCompletion(in controller: UIViewController) {
DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) { [weak self, weak controller] in
if controller?.presentedViewController == nil {
self?.isPresented.wrappedValue = false
} else if let controller = controller {
self?.trackCompletion(in: controller)
}
}
}
}
}
刚遇到这个问题!这是我的看法。
- 没有 SwiftUI 方法来调用有限的照片选择器。所以我们必须创建一个调用
.presentLimitedLibraryPicker
的视图控制器 (UIViewControllerRepresentable
)。但是,如果您将其显示为 sheet,它将立即显示选择器,并且您将在 sheet. 上获得 sheet
- 相反,将包装的 View Controller 直接嵌入 View 的主体并将其传递给条件触发器的绑定。
- 在包装的视图控制器中,查找
updateUIViewController
中条件的更改。如果值为 true
,显示选择器,然后立即关闭该值。
import SwiftUI
import UIKit
import PhotosUI
struct ContainingView: View {
@State var showLimitedPicker: Bool = false
var body: some View {
HStack {
Button("Load more…") { showLimitedPicker = true }
LimitedPicker(isPresented: $showLimitedPicker)
.frame(width: 0, height: 0)
}
}
}
struct LimitedPicker: UIViewControllerRepresentable {
@Binding var isPresented: Bool
func makeUIViewController(context: Context) -> UIViewController {
UIViewController()
}
func updateUIViewController(_ uiViewController: UIViewController, context: Context) {
if isPresented {
PHPhotoLibrary.shared().presentLimitedLibraryPicker(from: uiViewController)
DispatchQueue.main.async {
isPresented = false
}
}
}
}
从 SwiftUI 调用 PHPhotoLibrary 的 presentLimitedLibraryPicker 方法的正确方法是什么?
该方法需要一个 UIViewController,我在 SwiftUI 中没有。
我尝试使用 UIViewControllerRepresentable 来创建一个 UIViewController,它确实有效,但结果是出现了两个视图控制器,我用 UI 创建的那个ViewController可代表的,和有限的图书馆选择器。
两个视图控制器都需要关闭才能到达原始屏幕,这是不可取的。
总结一下我看到的问题:
- presentLimitedLibraryPicker 通过传递 ViewController. 来工作
- 这让我创建并呈现一个虚拟对象 ViewController,这样我就可以调用该方法。
- 无法获取对有限库选择器的引用,它也不提供委托。所以我无法检测到 Limited Library Picker 控制器何时被关闭。
这是我的尝试(它显示了选择器,但是当你关闭它时,你也需要关闭额外的虚拟视图控制器:
import Foundation
import SwiftUI
import Photos
import PhotosUI
struct TestView: View {
@State var showLibraryPicker = false
var body: some View {
NavigationView {
VStack {
Button("Open Library Picker") { showLibraryPicker = true }
}
.navigationBarTitle("Test", displayMode: .inline)
.navigationViewStyle(StackNavigationViewStyle())
.sheet(isPresented: $showLibraryPicker, onDismiss: { print("Dismissed") }) {
TestLimitedLibraryPicker()
}
}
}
}
struct TestLimitedLibraryPicker: UIViewControllerRepresentable {
func makeUIViewController(context: Context) -> UIViewController {
let controller = UIViewController()
PHPhotoLibrary.shared().presentLimitedLibraryPicker(from: controller)
return controller
}
func updateUIViewController(_ uiViewController: UIViewController, context: Context) {
}
}
下面是一些演示方法。使用 Xcode 12 / iOS 14.
准备和测试struct TestPhotosView: View {
@State var showLibraryPicker = false
var body: some View {
NavigationView {
VStack {
Button("Open Library Picker") { self.showLibraryPicker = true }
}
.navigationBarTitle("Test", displayMode: .inline)
.navigationViewStyle(StackNavigationViewStyle())
.background(Group {
if self.showLibraryPicker {
TestLimitedLibraryPicker(isPresented: $showLibraryPicker)
}
})
}
}
}
struct TestLimitedLibraryPicker: UIViewControllerRepresentable {
@Binding var isPresented: Bool
func makeUIViewController(context: Context) -> UIViewController {
let controller = UIViewController()
DispatchQueue.main.async {
PHPhotoLibrary.requestAuthorization() { result in
PHPhotoLibrary.shared().presentLimitedLibraryPicker(from: controller)
context.coordinator.trackCompletion(in: controller)
}
}
return controller
}
func updateUIViewController(_ uiViewController: UIViewController, context: Context) {}
func makeCoordinator() -> Coordinator {
Coordinator(isPresented: $isPresented)
}
class Coordinator: NSObject {
private var isPresented: Binding<Bool>
init(isPresented: Binding<Bool>) {
self.isPresented = isPresented
}
func trackCompletion(in controller: UIViewController) {
DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) { [weak self, weak controller] in
if controller?.presentedViewController == nil {
self?.isPresented.wrappedValue = false
} else if let controller = controller {
self?.trackCompletion(in: controller)
}
}
}
}
}
刚遇到这个问题!这是我的看法。
- 没有 SwiftUI 方法来调用有限的照片选择器。所以我们必须创建一个调用
.presentLimitedLibraryPicker
的视图控制器 (UIViewControllerRepresentable
)。但是,如果您将其显示为 sheet,它将立即显示选择器,并且您将在 sheet. 上获得 sheet
- 相反,将包装的 View Controller 直接嵌入 View 的主体并将其传递给条件触发器的绑定。
- 在包装的视图控制器中,查找
updateUIViewController
中条件的更改。如果值为true
,显示选择器,然后立即关闭该值。
import SwiftUI
import UIKit
import PhotosUI
struct ContainingView: View {
@State var showLimitedPicker: Bool = false
var body: some View {
HStack {
Button("Load more…") { showLimitedPicker = true }
LimitedPicker(isPresented: $showLimitedPicker)
.frame(width: 0, height: 0)
}
}
}
struct LimitedPicker: UIViewControllerRepresentable {
@Binding var isPresented: Bool
func makeUIViewController(context: Context) -> UIViewController {
UIViewController()
}
func updateUIViewController(_ uiViewController: UIViewController, context: Context) {
if isPresented {
PHPhotoLibrary.shared().presentLimitedLibraryPicker(from: uiViewController)
DispatchQueue.main.async {
isPresented = false
}
}
}
}