Same problem, I'm just follow a tutorial on youtube
the error in this code let sample = try! container.mainContext.fetch(fetchDescriptor)[0]
import SwiftUI
import SwiftData
struct SampleView: View {
let sample: SampleModel
var body: some View {
VStack{
Text(sample.name)
.font(.largeTitle)
Image(uiImage: sample.image == nil ? Constants.placeholder : sample.image!)
.resizable()
.scaledToFit()
.clipShape(RoundedRectangle(cornerRadius: 12))
}
.padding()
}
}
#Preview {
let container = SampleModel.preview
let fetchDescriptor = FetchDescriptor<SampleModel>()
let sample = try! container.mainContext.fetch(fetchDescriptor)[0]
SampleView(sample: sample)
}
import UIKit
import SwiftData
@Model
class SampleModel {
var name: String
@Attribute(.externalStorage)
var data: Data?
var image: UIImage? {
if let data {
return UIImage(data: data)
} else {
return nil
}
}
init(name: String, data: Data? = nil) {
self.name = name
self.data = data
}
}
extension SampleModel {
@MainActor
static var preview: ModelContainer {
let container = try! ModelContainer(
for: SampleModel.self,
configurations: ModelConfiguration(isStoredInMemoryOnly: true)
)
var samples: [SampleModel] {
[
.init(name: "Sample 1"),
.init(name: "Sample 2"),
.init(name: "Sample 3")
]
}
samples.forEach {
container.mainContext.insert($0)
}
return container
}
}```
```swift
import UIKit
enum Constants {
static let placeholder = UIImage(systemName: "photo.fill")!
}
ChenRui
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download always stoped around 75%
I have the same error. After I re-install the Xcode, it finally prepare successfully.