✨ [Feat] LoadingView 컴포넌트 구현

AppProduct/AppProduct/Core/Common/UIComponents/LoadingView/LoadingView.swift

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+//
+//  LoadingView.swift
+//  AppProduct
+//
+//  Created by 이예지 on 1/4/26.
+//
+
+import SwiftUI
+
+// MARK: - LoadingView
+
+struct LoadingView<Content: View>: View {
+
+    // MARK: - Properties
+    private let content: Content
+
+    @Environment(\.loadingViewIsPresented) private var isPresented
+    @Environment(\.loadingViewMessage) private var message
+    @Environment(\.loadingViewSize) private var size
+
+    // MARK: - Initializer
+
+    init(@ViewBuilder content: () -> Content) {
+        self.content = content()
+    }
+
+    // MARK: - Body
+
+    var body: some View {
+        ZStack {
+            content
+
+            if isPresented {
+                LoadingViewContent(message: message, size: size)
+                    .equatable()
+            }
+        }
+    }
+}
+
+// MARK: - LoadingViewContent (Presenter)
+private struct LoadingViewContent: View, Equatable {
+    let message: String?
+    let size: LoadingViewSize
+
+    static func == (lhs: LoadingViewContent, rhs: LoadingViewContent) -> Bool {
+        lhs.message == rhs.message &&
+        lhs.size == rhs.size
+    }
+
+    var body: some View {
+        VStack(spacing: 10) {
+            ProgressView()
+                .progressViewStyle(.circular)
+                .frame(width: size.size.width , height: size.size.height)
+
+            if let message {
+                Text(message)
+                    .font(size.font)
+            }
+        }
+    }
+}
+
+
+// MARK: - LoadingView + AnyLoadingView
+
+extension LoadingView: AnyLoadingView { }
+
+// MARK: - Preview
+
+#Preview("Loading ON + Message + Size") {
+    LoadingView {
+        RoundedRectangle(cornerRadius: 16)
+            .foregroundStyle(Color.accent100)
+            .frame(height: 160)
+            .overlay { Text("Content") }
+            .padding()
+    }
+    .presented(.constant(true))
+}

AppProduct/AppProduct/Core/Common/UIComponents/LoadingView/LoadingViewEnvironment.swift

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+//
+//  LoadingViewEnvironment.swift
+//  AppProduct
+//
+//  Created by 이예지 on 1/4/26.
+//
+
+import SwiftUI
+
+// MARK: - Environment Keys
+
+struct LoadingViewSizeKey: EnvironmentKey {
+    static let defaultValue: LoadingViewSize = .large
+}
+
+struct LoadingViewIsPresentedKey: EnvironmentKey {
+    static let defaultValue: Bool = false
+}
+
+struct LoadingViewMessageKey: EnvironmentKey {
+    static let defaultValue: String = "Loading..."
+}
+
+// MARK: - EnvironmentValues Extension
+
+extension EnvironmentValues {
+    var loadingViewSize: LoadingViewSize {
+        get { self[LoadingViewSizeKey.self] }
+        set { self[LoadingViewSizeKey.self] = newValue }
+    }
+
+    var loadingViewIsPresented: Bool {
+        get { self[LoadingViewIsPresentedKey.self] }
+        set { self[LoadingViewIsPresentedKey.self] = newValue }
+    }
+
+    var loadingViewMessage: String {
+        get { self[LoadingViewMessageKey.self] }
+        set { self[LoadingViewMessageKey.self] = newValue }
+    }
+}

AppProduct/AppProduct/Core/Common/UIComponents/LoadingView/LoadingViewModifier.swift

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+//
+//  LoadingViewModifier.swift
+//  AppProduct
+//
+//  Created by 이예지 on 1/4/26.
+//
+
+import SwiftUI
+
+// MARK: - AnyLoadingView Protocol
+
+/// LoadingView 전용 프로토콜
+/// 이 프로토콜을 준수하는 View만 LoadingView modifier 사용 가능
+protocol AnyLoadingView: View { }
+
+
+// MARK: - ViewModifiers
+
+struct LoadingViewSizeModifier: ViewModifier {
+    let size: LoadingViewSize
+
+    func body(content: Content) -> some View {
+        content.environment(\.loadingViewSize, size)
+    }
+}
+
+struct LoadingViewIsPresentedModifier: ViewModifier {
+    @Binding var isPresented: Bool
+
+    func body(content: Content) -> some View {
+        content.environment(\.loadingViewIsPresented, isPresented)
+    }
+}
+
+struct LoadingViewMessageModifier: ViewModifier {
+    let message: String
+
+    func body(content: Content) -> some View {
+        content.environment(\.loadingViewMessage, message)
+    }
+}
+
+// MARK: - AnyLoadingView Extension
+
+extension AnyLoadingView {
+
+    /// 로딩 사이즈 설정
+    /// - Parameter size: small, large
+    func loadingSize(_ size: LoadingViewSize) -> some View {
+        self.modifier(LoadingViewSizeModifier(size: size))
+    }
+
+    /// 로딩 isPresented
+    func presented(_ isPresented: Binding<Bool>) -> some View {
+        self.modifier(LoadingViewIsPresentedModifier(isPresented: isPresented))
+    }
+
+    /// 로딩 메시지 설정
+    func loadingMessage(_ message: String) -> some View {
+        self.modifier(LoadingViewMessageModifier(message: message))
+    }
+}

AppProduct/AppProduct/Core/Common/UIComponents/LoadingView/LoadingViewSize.swift

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+//
+//  LoadingViewSize.swift
+//  AppProduct
+//
+//  Created by 이예지 on 1/4/26.
+//
+
+import SwiftUI
+
+// MARK: - LoadingViewSize
+
+/// LoadingView 사이즈 유형 (향후 확장용)
+enum LoadingViewSize {
+    case small
+    case large
+
+    var size: CGSize {
+        switch self {
+        case .small:
+            return CGSize(width: 40, height: 40)
+        case .large:
+            return CGSize(width: 80, height: 80)
+        }
+    }
+
+    var font: Font {
+        switch self {
+        case .small:
+            return .app(.footnote, weight: .regular)
+        case .large:
+            return .app(.body, weight: .bold)
+        }
+    }
+}