Hello the stackOverFlow Swift group, I’m making a a number of picture picker following the tutorial on this video: https://www.youtube.com/watch?v=SfcJewIgF7Q. Nonetheless, on my struct CustomPicker View, I all the time getting this bug “The compiler is unable to type-check this expression in cheap time; attempt breaking apart the expression into distinct sub-expressions”. I attempted troubleshoot by eradicating the road one after the other and I seen if I take away
ForEach(i..<i+3, id: .self){j in
HStack{
if j < self.knowledge.depend{
Card(knowledge: self.knowledge[j], chosen: self.$chosen)
}
}
}
Then the error might be gone, the complete code is proven under
import SwiftUI
import Images
struct Dwelling: View{
@State var chosen : [UIImage] = []
@State var present = false
var physique: some View{
ZStack{
Shade.black.opacity(0.07).edgesIgnoringSafeArea(.all)
VStack{
if !self.chosen.isEmpty{
ScrollView(.horizontal, showsIndicators: false){
HStack(spacing: 20){
ForEach(self.chosen, id: .self){i in
Picture(uiImage: i)
.resizable()
.body(width: UIScreen.principal.bounds.width - 40, peak: 250)
.cornerRadius(15)
}
}
.padding(.horizontal, 20)
}
}
}
Button(motion: {
self.chosen.removeAll()
self.present.toggle()
}){
Textual content("Picture Picker")
.foregroundColor(.white)
.padding(.vertical, 10)
.body(width: UIScreen.principal.bounds.width/2)
}.background(Shade.crimson).clipShape(Capsule()).padding(.prime, 25)
}
if self.present {
CustomPicker(chosen: self.$chosen, present: self.$present)
}
}
}
struct CustomPicker: View {
@Binding var chosen:[UIImage]
@State var knowledge: [Images] = []
@State var grid: [Int] = []
@Binding var present : Bool
@State var disabled = false
var physique: some View {
GeometryReader{_ in
VStack{
if !self.grid.isEmpty{
HStack{
Textual content("Choose a Picture").fontWeight(.daring)
Spacer()
}
.padding(.main)
.padding(.prime)
ScrollView(.vertical, showsIndicators: false){
VStack(spacing: 20){
ForEach(self.grid, id: .self){ i in
HStack(spacing:8){
ForEach(i..<i+3, id: .self){j in
HStack{
if j < self.knowledge.depend{
Card(knowledge: self.knowledge[j], chosen: self.$chosen)
}
}
}
if self.knowledge.depend % 3 != 0 && i == self.grid.final!{
Spacer()
}
}
.padding(.main, (self.knowledge.depend % 3 != 0 && i == self.grid.final!) ? 15:0)
}
}
}
Button(motion:{
self.present.toggle()
}){
Textual content("Choose")
.foregroundColor(.white)
.padding(.vertical, 10)
.body(width: UIScreen.principal.bounds.width/2)
}
.background(Shade.crimson.opacity((self.chosen.depend != 0) ? 1 : 0.5))
.clipShape(Capsule())
.padding(.backside, 25)
.disabled((self.chosen.depend != 0) ? false : true)
}
else {
if self.disabled{
Textual content("Please allow storage entry")
}else{
Indicator()
}
}
}
.body(width: UIScreen.principal.bounds.width - 40, peak: UIScreen.principal.bounds.peak / 1.5)
.background(Shade.white)
.cornerRadius(12)
}
.background(Shade.black.opacity(0.1).edgesIgnoringSafeArea(.all)
.onTapGesture {
self.present.toggle()
})
.onAppear{
PHPhotoLibrary.requestAuthorization{(standing) in
if standing == .licensed{
self.getAllImages()
self.disabled = false
}
else {
print("not licensed")
self.disabled = true
}
}
}
}
func getAllImages(){
let req = PHAsset.fetchAssets(with: .picture, choices: .none)
DispatchQueue.international(qos: .background).async {
req.enumerateObjects {(asset, _, _) in
let choices = PHImageRequestOptions()
choices.isSynchronous = true
PHCachingImageManager.default().requestImage(for: asset, targetSize: .init(), contentMode: .default, choices: choices){(picture, _) in
let data1 = Photos(picture: picture!, chosen: false)
self.knowledge.append(data1)
}
}
if req.depend == self.knowledge.depend{
self.getGrid()
}
}
}
func getGrid(){
for i in stride(from: 0, to: self.knowledge.depend, by: 3){
self.grid.append(i)
}
}
}
struct Photos {
var picture : UIImage
var chosen : Bool
}
struct Card : View {
@State var knowledge : Photos
@Binding var chosen: [UIImage]
var physique : some View {
ZStack{
Picture(uiImage: self.knowledge.picture).resizable()
if self.knowledge.chosen{
ZStack{
Shade.black.opacity(0.5)
Picture(systemName: "checkmark")
.resizable()
.body(width: 30, peak: 30)
.foregroundColor(.white)
}
}
}.body(width: (UIScreen.principal.bounds.width - 80)/3, peak: 90)
.onTapGesture {
if !self.knowledge.chosen {
self.knowledge.chosen = true
self.chosen.append(self.knowledge.picture)
}
else {
for i in 0..<self.chosen.depend{
if self.chosen[i] == self.knowledge.picture{
self.chosen.take away(at: i)
self.knowledge.chosen = false
return
}
}
}
}
}
}
struct Indicator : UIViewRepresentable {
func makeUIView(context: Context) -> UIActivityIndicatorView {
let view = UIActivityIndicatorView(fashion: .giant)
view.startAnimating()
return view
}
func updateUIView(_ uiView: UIActivityIndicatorView, context: Context) {
}
}
I’ve completely no thought why the error might be solved by eradicating these strains. Could I ask why this error happen and the way I can forestall it? Thanks
