Support SwiftPM

.gitignore

@@ -64,4 +64,8 @@ fastlane/test_output
 # After new code Injection tools there's a generated folder /iOSInjectionProject
 # https://github.com/johnno1962/injectionforxcode
 
-iOSInjectionProject/
+iOSInjectionProject/
+
+# SwiftPM
+.swiftpm
+.build

Package.resolved

@@ -0,0 +1,25 @@
+{
+  "object": {
+    "pins": [
+      {
+        "package": "libwebp",
+        "repositoryURL": "https://github.com/SDWebImage/libwebp-Xcode.git",
+        "state": {
+          "branch": null,
+          "revision": "cad41dc4f84bbf13bfe2f3acf85c58d1cb316ea0",
+          "version": "1.1.0-rc2"
+        }
+      },
+      {
+        "package": "SDWebImage",
+        "repositoryURL": "https://github.com/SDWebImage/SDWebImage.git",
+        "state": {
+          "branch": null,
+          "revision": "7ef9a314b12c1a31edb0d09d41fcba93143fe772",
+          "version": "5.4.0"
+        }
+      }
+    ]
+  },
+  "version": 1
+}

Package.swift

@@ -0,0 +1,34 @@
+// swift-tools-version:5.0
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "SDWebImageWebPCoder",
+    platforms: [
+       .macOS(.v10_13), .iOS(.v8), .tvOS(.v10)
+    ],
+    products: [
+        // Products define the executables and libraries produced by a package, and make them visible to other packages.
+        .library(
+            name: "SDWebImageWebPCoder",
+            targets: ["SDWebImageWebPCoder"]),
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+        .package(url: "https://github.com/SDWebImage/SDWebImage.git", from: "5.1.0"),
+        .package(url: "https://github.com/SDWebImage/libwebp-Xcode.git", from: Version(1, 1, 0, prereleaseIdentifiers: ["-rc.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 which this package depends on.
+        .target(
+            name: "SDWebImageWebPCoder",
+            dependencies: ["SDWebImage", "libwebp"],
+            path: ".",
+            sources: ["SDWebImageWebPCoder/Classes"],
+            publicHeadersPath: "SDWebImageWebPCoder/Classes"
+        )
+    ]
+)

SDWebImageWebPCoder/Classes/SDImageWebPCoder.h

@@ -6,7 +6,11 @@
  * file that was distributed with this source code.
  */
 
+#if __has_include(<SDWebImage/SDWebImage.h>)
 #import <SDWebImage/SDWebImage.h>
+#else
+@import SDWebImage;
+#endif
 
 /**
  Built in coder that supports WebP and animated WebP

SDWebImageWebPCoder/Classes/SDImageWebPCoder.m

@@ -7,12 +7,6 @@
  */
 
 #import "SDImageWebPCoder.h"
-#import <SDWebImage/SDImageCoderHelper.h>
-#if __has_include(<SDWebImage/NSImage+Compatibility.h>)
-#import <SDWebImage/NSImage+Compatibility.h>
-#endif
-#import <SDWebImage/UIImage+Metadata.h>
-#import <SDWebImage/UIImage+ForceDecode.h>
 
 #if __has_include("webp/decode.h") && __has_include("webp/encode.h") && __has_include("webp/demux.h") && __has_include("webp/mux.h")
 #import "webp/decode.h"
@@ -24,6 +18,8 @@
 #import <libwebp/encode.h>
 #import <libwebp/demux.h>
 #import <libwebp/mux.h>
+#else
+@import libwebp;
 #endif
 
 #import <Accelerate/Accelerate.h>

SDWebImageWebPCoder/Classes/UIImage+WebP.h

@@ -6,7 +6,11 @@
  * file that was distributed with this source code.
  */
 
+#if __has_include(<SDWebImage/SDWebImage.h>)
 #import <SDWebImage/SDWebImage.h>
+#else
+@import SDWebImage;
+#endif
 
 // This category is just use as a convenience method. For more detail control, use methods in `UIImage+MultiFormat.h` or directlly use `SDImageCoder`
 @interface UIImage (WebP)