[ios] WIP: Switching main/map buttons to SwiftUI

Signed-off-by: Yannik Bloscheck <git@yannikbloscheck.com>

iphone/Maps/UI/FloatingButtonStyle.swift

@@ -0,0 +1,39 @@
+import SwiftUI
+
+struct FloatingButtonStyle: ButtonStyle {
+    /// If the button is round
+    var isRound: Bool = true
+    
+    
+    func makeBody(configuration: Configuration) -> some View {
+        configuration.label
+        .labelStyle(.iconOnly)
+        .padding(10)
+        .aspectRatio(1, contentMode: .fill)
+        .background {
+            if isRound {
+                Circle()
+                .stroke(Color.white.opacity(0.7), lineWidth: 1)
+                .background {
+                    Color.white.opacity(configuration.isPressed ? 0.7 : 0.8)
+                    .clipShape(Circle())
+                }
+                .aspectRatio(1, contentMode: .fill)
+                .shadow(radius: 2)
+            } else {
+                RoundedRectangle(cornerRadius: 8)
+                .stroke(Color.white.opacity(0.7), lineWidth: 1)
+                .background {
+                    Color.white.opacity(configuration.isPressed ? 0.7 : 0.8)
+                    .clipShape(RoundedRectangle(cornerRadius: 8))
+                }
+                .aspectRatio(1, contentMode: .fill)
+                .shadow(radius: 3)
+            }
+        }
+        .font(.title2)
+        .foregroundStyle(configuration.role == .destructive ? Color(.BaseColors.red) : Color.secondary)
+        .scaleEffect(configuration.isPressed ? (isRound ? 0.96 : 0.98) : 1)
+        .animation(.smooth, value: configuration.isPressed)
+    }
+}