Lower required Swift version to 5.1

.github/workflows/ci.yml

@@ -0,0 +1,27 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: macOS-latest
+    strategy:
+      matrix:
+        action: [build, archive]
+    steps:
+    - name: Cancel Previous Runs
+      uses: styfle/cancel-workflow-action@0.5.0
+      with:
+        access_token: ${{ github.token }}
+    - name: Git Checkout
+      uses: actions/checkout@v2
+    - name: ${{ matrix.action }}
+      run: |
+        xcodebuild -sdk iphoneos -scheme MultiSheet clean ${{ matrix.action }} | xcpretty
+        exit ${PIPESTATUS[0]}

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.3
+// swift-tools-version:5.1
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription

Sources/MultiSheet/MultiSheetPreview.swift

@@ -8,9 +8,9 @@ struct MultiSheetDemoView_Previews: PreviewProvider {
 
         var body: some View {
             VStack(spacing: 20) {
-                Button("Sheet A") { sheetAPresented = true }
-                Button("Sheet B") { sheetBPresented = true }
-                Button("Sheet C") { sheetCPresented = true }
+                Button("Sheet A") { self.sheetAPresented = true }
+                Button("Sheet B") { self.sheetBPresented = true }
+                Button("Sheet C") { self.sheetCPresented = true }
             }
             .multiSheet {
                 $0.sheet(isPresented: $sheetAPresented) { Text("Sheet A") }
@@ -27,16 +27,17 @@ struct MultiSheetDemoView_Previews: PreviewProvider {
 
         var body: some View {
             VStack(spacing: 20) {
-                Button("Sheet A") { sheetAPresented = true }
-                Button("Sheet B") { sheetBPresented = true }
-                Button("Sheet C") { sheetCPresented = true }
+                Button("Sheet A") { self.sheetAPresented = true }
+                Button("Sheet B") { self.sheetBPresented = true }
+                Button("Sheet C") { self.sheetCPresented = true }
             }
             .sheet(isPresented: $sheetAPresented) { Text("Sheet A") }
             .sheet(isPresented: $sheetBPresented) { Text("Sheet B") }
             .sheet(isPresented: $sheetCPresented) { Text("Sheet C") }
         }
     }
 
+    @ViewBuilder
     static var previews: some View {
         MultiSheetDemoView().previewDisplayName("With MultiSheet")
         NoMultiSheetDemoView().previewDisplayName("Without MultiSheet")