refactor: migrate previews from PreviewProvider to #Preview macro (#37)

Author: quver

Sources/SlidableImage/Arrows.swift

@@ -30,11 +30,9 @@ public struct Arrows: View {
     }
 }
 
-struct ArrowsPreview: PreviewProvider {
-    static var previews: some View {
-        VStack {
-            Arrows()
-            Arrows(arrowColor: .green, backgroundColor: .orange)
-        }
+#Preview {
+    VStack {
+        Arrows()
+        Arrows(arrowColor: .green, backgroundColor: .orange)
     }
 }

Sources/SlidableImage/SlidableImage.swift

@@ -55,10 +55,8 @@ public struct SlidableImage<ArrowsIcon: View, LeftView: View, RightView: View>:
     }
 }
 
-struct SlidableImagePreview: PreviewProvider {
-    static var previews: some View {
-        SlidableImage(arrows: { Arrows() },
-                      leftView: { Color.red },
-                      rightView: { Color.green })
-    }
+#Preview {
+    SlidableImage(arrows: { Arrows() },
+                  leftView: { Color.red },
+                  rightView: { Color.green })
 }

Sources/SlidableImage/Triangle.swift

@@ -16,9 +16,7 @@ struct Triangle: Shape {
     }
 }
 
-struct Triangle_Previews: PreviewProvider {
-    static var previews: some View {
-        Triangle()
-            .frame(width: 100, height: 100)
-    }
+#Preview {
+    Triangle()
+        .frame(width: 100, height: 100)
 }