I'm trying to change the background colour of a row in a list based on a value
I have an Int16 value stored in card.owned and I want to change the background if this value is above 0, otherwise use the normal background.
Previously with a table view I could change it with the cellForRowAtIndexPath method, but not sure how to do it with SwiftUI without changing every row
Currently I have
ForEach(cards) { section in
let header: String = nameForSectionHeader(sectionID: section.id)
Section(header: Text(header)) {
ForEach(section) { card in
NavigationLink(destination: CardView(card: card)) {
VStack(alignment: .leading) {
if let name = card.name, let id = card.cardID {
Text("\(id) - \(name)")
}
if let set = card.set, let setName = set.name {
Text("Set: \(setName)")
}
if card.owned > 0 {
Text("Owned: \(card.owned)")
}
}
}
}
}
}
.listRowBackground(lightGreen)
}
Selecting any option will automatically load the page
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I have a list with sections headers on two views. One view has the section headers as collapsible, the other doesn't.
Both use pretty much the same code, what defines if a section header is collapsible?
Code for the one that doesn't collapse
ForEach(cards) { section in
let header: String = nameForSectionHeader(sectionID: section.id)
Section(header: Text(header)) {
ForEach(section) { card in
NavigationLink(destination: CardView(card: card)) {
HStack {
Image(card.imageName ?? "")
.renderingMode(.original)
.resizable()
.scaledToFit()
.frame(width: 50.0)
VStack(alignment: .leading) {
if let name = card.name, let id = card.cardID {
Text("\(id) - \(name)")
}
Text("Owned: \(card.owned)")
}
}
}
}
}
}
}
and the code for the one that does
ForEach(cards) { section in
let header: String = nameForSectionHeader(sectionID: section.id)
Section(header: Text(header)) {
ForEach(section) { card in
NavigationLink(destination: CardView(card: card)) {
VStack(alignment: .leading) {
if let name = card.name, let id = card.cardID {
Text("\(id) - \(name)")
}
if let set = card.set, let setName = set.name {
Text("Set: \(setName)")
}
if card.owned > 0 {
Text("Owned: \(card.owned)")
}
}
}
}
}
}
.listRowBackground(lightGreen)
}
I have the below fetch request which I want to be able to dynamically change the setup of.
The request is setup initially as
sectionIdentifier: \.level,
sortDescriptors: [NSSortDescriptor(keyPath: \Card.level, ascending: true),
NSSortDescriptor(keyPath: \Card.setID, ascending: true),
NSSortDescriptor(keyPath: \Card.cardID, ascending: true),
NSSortDescriptor(keyPath: \Card.name, ascending: true)],
animation: .default)
private var cards: SectionedFetchResults<Int16, Card>
I've got the predicate change working fine, but get errors with the sort descriptors and the section identifier
On setting the sort descriptors I get the error
Cannot convert value of type 'NSSortDescriptor' to expected element type 'Array<SortDescriptor>.ArrayLiteralElement' (aka 'SortDescriptor')
And setting the section identifier I get
Cannot assign value of type 'SectionedFetchResults<String, Card>.Type' to type 'KeyPath<Card, Int16>'
The code I have is below.
if groupBy == 2 {
cards.nsPredicate = nil
let sortSetID = NSSortDescriptor(keyPath: \Card.setID, ascending: true)
let sortName = NSSortDescriptor(keyPath: \Card.name, ascending: true)
cards.sortDescriptors = [sortSetID, sortName] // This errors
cards.sectionIdentifier = SectionedFetchResults<String, Card> // This errors
}
I'm currently using a navigationview and am now getting an warning
'init(destination:tag:selection:label:)' was deprecated in iOS 16.0: use NavigationLink(value:label:) inside a List within a NavigationStack or NavigationSplitView
I'm trying to move to another view from a button (there will be several hence using tags) but I can't seem to get my head around how to do it.
The code I currently have
var body: some View {
List {
NavigationLink(destination: ProjectColourAddView(project: project), tag: 1, selection: $action) {
EmptyView()
}
Group {
Button(action: { self.showImageMenu = true }) {
Text("New Title Image")
}
.confirmationDialog("Select Image Source", isPresented: $showImageMenu, titleVisibility: .visible) {
Button("Take Photo") {
self.isShowCamera = true
}
Button("Choose from Albums") {
self.isShowPhotoLibrary = true
}
}
Button(action: {
self.action = 3
NSLog("More Images")
}) {
Text("More Images (x)")
}
Button(action: {
self.action = 2
NSLog("Add Image")
}) {
Text("Add Image")
}
Button(action: {
self.action = 1
NSLog("Colour List")
}) {
Text("Colour List")
}
}
}
}
I'm looking to see if its possible to change the background colour of a cell, but fill it based on a percentage
I'm creating the cell in a List {}
let gradient = LinearGradient(colors: [.green, .white], startPoint: .leading, endPoint: .trailing)
List {
Section(header: Text("Total")) {
Text("Total Obtained: \(totalObtained) - \(totalComplete)%")
.listRowBackground(gradient)
}
}
totalComplete has the percentage variable
Xcode keeps complaining about changes when I try and commit, I get the error "The local repository is out of date."
When I try and pul changes from the remote, I get the message "Your local repository has uncommitted changes that need to be stashed before you can continue. "
When I try and commit, every time it shows a UserInterfaceState.xcuserstate file. if I try and commit it I get the local repository error.
I have a list view created from core data, and it's sectioned by a property called favourite. In the detail view a user is able to either add an item or remove it as a favourite.
When the property is updated, it causes the detail view to pop back to the list view, which I don't want it to do, and don't know how to get it to not do that
The creation of the list
@SectionedFetchRequest var dims: SectionedFetchResults<Int16, DIM>
init() {
_dims = SectionedFetchRequest<Int16, DIM>(
sectionIdentifier: \.favourite,
sortDescriptors: [NSSortDescriptor(keyPath: \DIM.favourite, ascending: false), NSSortDescriptor(keyPath: \DIM.name, ascending: true)]
)
}
List {
ForEach(dims) { section in
let header: String = nameForSectionHeader(sectionID: section.id)
Section(header: Text(header)) {
ForEach(section) { dim in
NavigationLink(destination: DIMListView(dim: dim)) {
}
}
}
}
}
and then on the detail view there's a toolbar with an option to add/remove favourite.
.toolbar {
ToolbarItem(placement: .navigationBarTrailing) {
Button("Options") {
showingAlertFav = true
}
.alert("Choose an option", isPresented: $showingAlertFav) {
if dim.favourite == 0 {
Button("Favourite", role: .none) {
setFav(fav: 1)
}
} else {
Button("Unfavourite", role: .none) {
setFav(fav: 0)
}
}
}
}
}
func setFav(fav : Int16) {
dim.favourite = fav
saveContext()
}
I'm trying to adjust a list so that it can have multiple selection.
It works when I use hard coded data, but when I try and use it with core data, the option to edit the list doesn't bring the checkboxes up.
Working code
struct DIMTest: Identifiable {
let id = UUID()
let name: String
}
struct DimTypeListView: View {
let contacts = [
DIMTest(name: "John"),
DIMTest(name: "Alice"),
DIMTest(name: "Bob")
]
// 2
@State private var multiSelection = Set<DIM>()
var body: some View {
NavigationView {
VStack {
// 3
List(contacts, selection: $multiSelection) { contact in
Text(contact.name)
}
Text("\(multiSelection.count) selections")
}
.navigationTitle("Contacts")
.toolbar {
// 4
EditButton()
}
}
}
}
but when I adjust the code to the below to load from core data, I don't get the checkboxes
@SectionedFetchRequest var dims: SectionedFetchResults<Bool, DIM>
init(dType: DimType) {
_dims = SectionedFetchRequest<Bool, DIM>(
sectionIdentifier: \.favourite,
sortDescriptors: [NSSortDescriptor(keyPath: \DIM.favourite, ascending: false), NSSortDescriptor(keyPath: \DIM.name, ascending: true)],
predicate: NSPredicate(format: "dimType = %@", dType)
)
}
@State private var multiSelection = Set<DIM>()
var body: some View {
VStack {
List(dims, selection: $multiSelection) { section in
Section() {
ForEach(section) { dim in
Text("Name")
}
}
}
Text("\(multiSelection.count) selections")
}
.navigationTitle("DIMs")
.toolbar {
EditButton()
}
}
It shows the correct number of entries, but can't be selected
If i add an onDelete, i get the delete options but only want to be able to select, not delete
I'm trying to do a mass conversion of images to data so it can be stored in core data.
The conversion part works fine, and if I do it without updating core data it shows memory usage at less that 100MB
If I update the core data object, it just keeps consuming memory until the app crashes.
func updateLocalImages() {
let fetchRequest: NSFetchRequest<Picture> = Picture.fetchRequest()
fetchRequest.predicate = NSPredicate(format: "pictureName != \"\"")
do {
let pictures = try moc.fetch(fetchRequest)
print("Picture Update Count: \(pictures.count)")
for picture in pictures {
let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
let path = paths[0]
if let picName = picture.pictureName {
let imagePath = path.appendingPathComponent(picName)
if let uiImage = UIImage(contentsOfFile: imagePath.path) {
if let imageData = uiImage.jpegData(compressionQuality: 1.0) {
autoreleasepool {
picture.pictureData = imageData
print("Picture Updated")
saveContext()
}
}
}
}
}
} catch {
print("Fetching Failed")
}
}
If I comment out the picture.pictureData = imageData line I don't get the memory issues.
What's the correct way of going about this? There is an unknown number of images (mine current sits at about 5.5GB worth, 800+)
I'm trying to move an app over to swiftui and have run into a couple of issues involving quick actions.
I'm trying to get the app to respond to the action.
I have a CustomSceneDelegate setup, which is receiving the actions.
How do I get it to navigate to a view when the addProject is used, and how do I get a core data query in the addTime?
class CustomSceneDelegate: UIResponder, UIWindowSceneDelegate {
func windowScene(_ windowScene: UIWindowScene, performActionFor shortcutItem: UIApplicationShortcutItem, completionHandler: @escaping (Bool) -> Void) {
handleShortcutItem(shortcutItem)
}
func handleShortcutItem(_ shortcutItem: UIApplicationShortcutItem) {
if shortcutItem.type == "addProject" {
print("Phase: Add Project")
} else if shortcutItem.type == "addTime" {
print("Phase: Add Time")
}
}
}
I'm trying to setup a filter option for some core data records, but I'm not seeing the expected results.
Essentially, what I want is to have multiple sections. Within each section it would be an OR query, and an AND between each section. I've tried setting it up as below.
func getBasicFilter() -> NSPredicate? {
var predicatesBagsLeft : [NSPredicate] = []
var predicatesDrillType : [NSPredicate] = []
var andPredicates : [NSPredicate] = []
print("Filter List")
print(filters)
// Bags Left
if let show = filters["showFullLeft"] {
if show {
print("Predicates : Show Full")
let predicate = NSPredicate(format: "ANY projectColours.fullLeft > 0")
predicatesBagsLeft.append(predicate)
}
}
if let show = filters["showPartialLeft"] {
if show {
print("Predicates : Show Partial")
let predicate = NSPredicate(format: "ANY projectColours.partialLeft > 0")
predicatesBagsLeft.append(predicate)
}
}
// Drill Types
if let show = filters["showSquareOnly"] {
if show {
print("Predicates : Show Square Only")
let predicate = NSPredicate(format: "ANY projectColours.project.drillType = %@", "Square")
predicatesDrillType.append(predicate)
}
}
// Drill Manufacturers - TO DO
// Combine Predicates
if predicatesBagsLeft.count > 0 {
let predicatesForBagsLeft = NSCompoundPredicate(type: .or, subpredicates: predicatesBagsLeft)
andPredicates.append(predicatesForBagsLeft)
}
if predicatesDrillType.count > 0 {
let predicatesForDrillType = NSCompoundPredicate(type: .or, subpredicates: predicatesDrillType)
andPredicates.append(predicatesForDrillType)
}
if andPredicates.count > 0 {
let predicates = NSCompoundPredicate(type: .and, subpredicates: andPredicates)
return predicates
}
return nil
}
It does filter, but doesn't seem to be applying both correctly. I'm testing with a filter of showFullLeft & showSquareOnly, so it should show only squares which have a a fullest > 0
I'm getting 7 results back, but one of them is unwanted. It is square, but it has 0 for both full & partial
When I look at the query core data is using it looks correct
CoreData: sql: SELECT t0.ZMANU, COUNT (DISTINCT t0.Z_PK) FROM ZCOLOUR t0 JOIN ZPROJECTCOLOUR t1 ON t0.Z_PK = t1.ZCOLOUR JOIN ZPROJECTCOLOUR t2 ON t0.Z_PK = t2.ZCOLOUR JOIN ZPROJECT t3 ON t2.ZPROJECT = t3.Z_PK WHERE ( t1.ZFULLLEFT > ? AND t3.ZDRILLTYPE = ?) GROUP BY t0.ZMANU ORDER BY t0.ZMANU
CoreData: details: SQLite bind[0] = 0
CoreData: details: SQLite bind[1] = "Square"
I'm trying to look at what the best way to do thumbnails for images that are saved in core data, which are being synced across multiple devices.
I know I can save a lower quality version into core data, but I'm wondering if there's a better way of doing it.
I've come across quick look thumbnailing which looks like what I want, but I'm not sure if it can be adapted for core data as its using file paths, whereas the images are stored in a data type property in core data.
From what I can tell, I'd have to save the image locally, produce the thumbnail, then delete the local image
So I’m trying to setup an existing app to work with iCloud syncing. The syncing part seems to be working for the most part.
When the app is first installed it sets up some data locally.
Throughout the life of the app additional data is added through updates. There is a user default setup that stores the current data version, then compares it with the new version. If it’s newer, then loads the additional data.
The issue I’ve got is a user can delete the app and reinstall, or install on another device which has that data version as 0, prompting another import even though the data in the cloud is current version, resulting in duplicate data once the sync is done.
How can I persist that version data? I’ve seen NSUbiquitousKeyValueStore which seems to be a cloud based version of user defaults, but it says not to rely on it if it’s critical to app functions
Topic:
App & System Services
SubTopic:
iCloud & Data
I've got a List containing Colour objects. Each colour may have an associated Project Colour object.
What I'm trying to do is set it up so that you can tap a cell and it will add/remove a project colour.
The adding/removing is working, but each time I do so, it appears the whole view is reloaded, the scroll position is reset and any predicate is removed.
This code I have so far
List {
ForEach(colourList) { section in
let header : String = section.id
Section(header: Text(header)) {
ForEach(section) { colour in
HStack {
if checkIfProjectColour(colour: colour) {
Image(systemName: "checkmark")
}
VStack(alignment: .leading){
HStack {
if let name = colour.name {
Text(name)
}
}
}
Spacer()
}
.contentShape(Rectangle())
.onTapGesture {
if checkIfProjectColour(colour: colour) {
removeProjectColour(colour: colour)
} else {
addProjectColour(colour: colour)
}
}
}
}
}
.onAppear() {
filters = appSetting.filters
colourList.nsPredicate = getFilterPredicate()
print("predicate: on appear - \(String(describing: getFilterPredicate()))")
}
.refreshable {
viewContext.refreshAllObjects()
}
}
.searchable(text: $searchText)
.onSubmit(of: .search) {
colourList.nsPredicate = getFilterPredicate()
}
.onChange(of: searchText) {
colourList.nsPredicate = getFilterPredicate()
}
The checkIfProjectColour function
func checkIfProjectColour(colour : Colour) -> Bool {
if let proCols = project.projectColours {
for proCol in proCols {
let proCol = proCol as! ProjectColour
if let col = proCol.colour {
if col == colour {
return true
}
}
}
}
return false
}
and the add/remove functions
func addProjectColour(colour : Colour) {
let projectColour = ProjectColour(context: viewContext)
projectColour.project = project
projectColour.colour = colour
colour.addToProjectColours(projectColour)
project.addToProjectColours(projectColour)
do {
try viewContext.save()
} catch {
let nsError = error as NSError
fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
}
}
func removeProjectColour(colour: Colour) {
if let proCols = project.projectColours {
for proCol in proCols {
let proCol = proCol as! ProjectColour
if let col = proCol.colour {
if col == colour {
viewContext.delete(proCol)
do {
try viewContext.save()
} catch {
let nsError = error as NSError
fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
}
}
}
}
}
}
I have a grid setup where I'm displaying multiple images which is working fine. Images are ordered by the date they're added, newest to oldest.
I'm trying to set it up so that the user can change the sort order themselves but am having trouble getting the view to update.
I'm setting the fetch request using oldest to newest as default when initialising the view, then when its appears updating the sort descriptor
struct ProjectImagesListView: View {
@Environment(\.managedObjectContext) private var viewContext
var project : Project
let columns = [
GridItem(.flexible()),
GridItem(.flexible()),
GridItem(.flexible()),
GridItem(.flexible())
]
@FetchRequest var pictures: FetchedResults<Picture>
var body: some View {
ScrollView {
LazyVGrid(columns: columns) {
ForEach(pictures) { picture in
NavigationLink(destination: ProjectImageDetailView(picture: picture)) {
if let pictureData = picture.pictureThumbnailData, let uiImage = UIImage(data: pictureData) {
Image(uiImage: uiImage)
.resizable()
.scaledToFit()
.frame(height: 100)
} else {
Image("missing")
.resizable()
.scaledToFit()
.frame(height: 100)
}
}
}
}
}
.navigationBarTitle("\(project.name ?? "") Images", displayMode: .inline)
.onAppear() {
guard let sortOrder = getSettingForPhotoOrder() else { return }
guard let sortOrderValue = sortOrder.settingValue else { return }
NSLog("sortOrderPhotos: \(String(describing: sortOrder.settingValue))")
if sortOrderValue == "Newest" {
NSLog("sortOrderPhotos: Change from default")
let newSortDescriptor = NSSortDescriptor(keyPath: \Picture.dateTaken, ascending: false)
pictures.nsSortDescriptors = [newSortDescriptor]
}
}
}
func getSettingForPhotoOrder() -> Setting? {
let fetchRequest: NSFetchRequest<Setting> = Setting.fetchRequest()
fetchRequest.predicate = NSPredicate(format: "name = %@", "photoSortOrder")
fetchRequest.fetchLimit = 1
do {
let results = try viewContext.fetch(fetchRequest)
return results.first
} catch {
print("Fetching Failed")
}
return nil
}
init(project: Project) {
self.project = project
_pictures = FetchRequest(
entity: Picture.entity(),
sortDescriptors: [
NSSortDescriptor(keyPath: \Picture.dateTaken, ascending: true)
],
predicate: NSPredicate(format: "project == %@", project)
)
}
}
Topic:
UI Frameworks
SubTopic:
SwiftUI