Add custom alert shadow

#32

Sources/CustomAlert/Configuration/CustomAlertConfiguration.Alert.swift

@@ -31,6 +31,8 @@ extension CustomAlertConfiguration {
         public var spacing: CGFloat
         /// The alignment of the content of the alert view
         public var alignment: CustomAlertAlignment
+        /// Optional shadow applied to the alert
+        public var shadow: CustomAlertShadow?
 
         init() {
             self.background = .blurEffect(.systemMaterial)
@@ -43,6 +45,7 @@ extension CustomAlertConfiguration {
             self.contentFont = .footnote
             self.spacing = 4
             self.alignment = .center
+            self.shadow = nil
         }
 
         /// Create a custom configuration

Sources/CustomAlert/Configuration/CustomAlertShadow.swift

@@ -0,0 +1,36 @@
+//
+//  CustomAlertShadow.swift
+//  CustomAlert
+//
+//  Created by David Walter on 16.11.24.
+//
+
+import SwiftUI
+
+/// Shadow configuration of the alert
+public struct CustomAlertShadow: Sendable {
+    let color: Color
+    let radius: CGFloat
+    let x: CGFloat
+    let y: CGFloat
+
+    /// Create a custom alert shadow
+    ///
+    /// - Parameters:
+    ///   - color: The shadow's color.
+    ///   - radius: A measure of how much to blur the shadow. Larger values
+    ///     result in more blur.
+    ///   - x: An amount to offset the shadow horizontally from the view.
+    ///   - y: An amount to offset the shadow vertically from the view.
+    public init(
+        color: Color = Color(.sRGBLinear, white: 0, opacity: 0.33),
+        radius: CGFloat,
+        x: CGFloat = 0,
+        y: CGFloat = 0
+    ) {
+        self.color = color
+        self.radius = radius
+        self.x = x
+        self.y = y
+    }
+}

Sources/CustomAlert/Helper/ShadowApplier.swift

@@ -0,0 +1,26 @@
+//
+//  ShadowApplier.swift
+//  CustomAlert
+//
+//  Created by David Walter on 16.11.24.
+//
+
+import SwiftUI
+
+extension View {
+    func shadow(_ shadow: CustomAlertShadow?) -> some View {
+        modifier(ShadowApplier(shadow: shadow))
+    }
+}
+
+private struct ShadowApplier: ViewModifier {
+    let shadow: CustomAlertShadow?
+
+    func body(content: Content) -> some View {
+        if let shadow {
+            content.shadow(color: shadow.color, radius: shadow.radius, x: shadow.x, y: shadow.y)
+        } else {
+            content
+        }
+    }
+}

Sources/CustomAlert/Views/CustomAlert.swift

@@ -195,6 +195,7 @@ import SwiftUI
         .frame(minWidth: minWidth, maxWidth: maxWidth)
         .background(BackgroundView(background: configuration.alert.background))
         .cornerRadius(configuration.alert.cornerRadius)
+        .shadow(configuration.alert.shadow)
         .padding(configuration.padding)
         .transition(configuration.transition)
         .animation(.default, value: isPresented)