[file_selector] Add support for SPM (#6672)

Adjusts the structure of the iOS and macOS implementations to match SPM layout conventions, adds the SPM package specifications, and updates the podspecs to reflect the new paths to keep compatibility with Cocoapods.

Does not include any Xcode project updates, in order to preserve compatibility with stable.

Fixes flutter/flutter#146903

Author: stuartmorgan-g

packages/file_selector/file_selector_ios/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.5.2
+
+* Adds Swift Package Manager compatibility.
+
 ## 0.5.1+9
 
 * Adjusts implementation for testabiity.

packages/file_selector/file_selector_ios/ios/Assets/.gitkeep

@@ -13,11 +13,11 @@ Displays the native iOS document picker.
   s.license          = { :type => 'BSD', :file => '../LICENSE' }
   s.author           = { 'Flutter Dev Team' => 'flutter-dev@googlegroups.com' }
   s.source           = { :http => 'https://github.com/flutter/packages/tree/main/packages/file_selector/file_selector_ios' }
-  s.source_files = 'Classes/**/*.{h,m}'
-  s.module_map = 'Classes/FileSelectorPlugin.modulemap'
+  s.source_files = 'file_selector_ios/Sources/file_selector_ios/**/*.{h,m}'
+  s.module_map = 'file_selector_ios/Sources/file_selector_ios/include/cocoapods_file_selector_ios.modulemap'
   s.dependency 'Flutter'
   s.platform = :ios, '12.0'
   s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES' }
   s.swift_version = '5.0'
-  s.resource_bundles = {'file_selector_ios_privacy' => ['Resources/PrivacyInfo.xcprivacy']}
+  s.resource_bundles = {'file_selector_ios_privacy' => ['file_selector_ios/Sources/file_selector_ios/Resources/PrivacyInfo.xcprivacy']}
 end

packages/file_selector/file_selector_ios/ios/file_selector_ios.podspec

@@ -0,0 +1,32 @@
+// swift-tools-version: 5.9
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import PackageDescription
+
+let package = Package(
+  name: "file_selector_ios",
+  platforms: [
+    .iOS("12.0")
+  ],
+  products: [
+    .library(name: "file-selector-ios", targets: ["file_selector_ios"])
+  ],
+  dependencies: [],
+  targets: [
+    .target(
+      name: "file_selector_ios",
+      dependencies: [],
+      exclude: ["include/cocoapods_file_selector_ios.modulemap"],
+      resources: [
+        .process("Resources")
+      ],
+      cSettings: [
+        .headerSearchPath("include/file_selector_ios")
+      ]
+    )
+  ]
+)

packages/file_selector/file_selector_ios/ios/file_selector_ios/Package.swift

@@ -3,8 +3,9 @@
 // found in the LICENSE file.
 
 #import "FFSFileSelectorPlugin.h"
+
+#import "./include/file_selector_ios/messages.g.h"
 #import "FFSFileSelectorPlugin_Test.h"
-#import "messages.g.h"
 
 #import <objc/runtime.h>