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Liang Wang
Liang Wang

Posted on

defer

#swiftui

I am using photoPicker to select an image from photo library, and before using defer, my code looks like this

PhotosPicker(selection: $selectedItem, matching: .images) { Label("Select an image", systemImage: "photo") } .onChange(of: selectedItem) { _, newValue in isLoadingImage = true Task { if let data = try? await newValue?.loadTransferable(type: Data.self) { selectedImageData = data if let selectedImageData, let uiImage = UIImage(data: selectedImageData) { inputImage = uiImage } } isLoadingImage = false } //: Task } //: onChange
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After using defer and change try? to do { try } catch { }, my code now looks like this

PhotosPicker(selection: $selectedItem, matching: .images) { Label("Select an image", systemImage: "photo") } .onChange(of: selectedItem) { _, newValue in Task { isLoadingImage = true defer { isLoadingImage = false } do { if let data = try await newValue?.loadTransferable(type: Data.self) { selectedImageData = data if let selectedImageData, let uiImage = UIImage(data: selectedImageData) { inputImage = uiImage } } } catch { print("Failed to load image: \(error.localizedDescription)") } } //: Task } //: onChange
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