Adds SPM support

Classes/PHFComposeBarView.m

@@ -1,5 +1,5 @@
 #import <QuartzCore/QuartzCore.h>
-#import <PHFDelegateChain/PHFDelegateChain.h>
+@import PHFDelegateChain;
 #import "PHFComposeBarView.h"
 #import "PHFComposeBarView_TextView.h"
 #import "PHFComposeBarView_Button.h"

Package.resolved

@@ -0,0 +1,16 @@
+{
+  "object": {
+    "pins": [
+      {
+        "package": "PHFDelegateChain",
+        "repositoryURL": "https://github.com/mmllr/PHFDelegateChain.git",
+        "state": {
+          "branch": null,
+          "revision": "f2ec82f250631adef058ac97a19387fd40445caa",
+          "version": "1.0.2"
+        }
+      }
+    ]
+  },
+  "version": 1
+}

Package.swift

@@ -0,0 +1,34 @@
+// swift-tools-version:5.0
+
+import PackageDescription
+
+let package = Package(
+    name: "PHFComposeBarView",
+    platforms: [
+        .iOS(.v9)
+    ],
+    products: [
+        // Products define the executables and libraries a package produces, and make them visible to other packages.
+        .library(
+            name: "PHFComposeBarView",
+            targets: ["PHFComposeBarView"]),
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),        //
+        .package(url: "https://github.com/mmllr/PHFDelegateChain.git", from: "1.0.2")
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        .target(
+            name: "PHFComposeBarView",
+            dependencies: [
+                "PHFDelegateChain"
+            ],
+            path: "Classes",
+            exclude: ["Example", "Screenshots"],
+            publicHeadersPath: "."
+        )
+    ]
+)