feat(ios): add backgroundColor option

example/src/App.tsx

@@ -15,7 +15,7 @@ export default function App() {
   const [isLoading, setIsLoading] = React.useState(false);
   const [width, setWidth] = React.useState<number | undefined>(594);
   const [height, setHeight] = React.useState<number | undefined>(842);
-  const [backgroundColor, setBackgroundColor] = React.useState('#fff');
+  const [backgroundColor, setBackgroundColor] = React.useState('red');
   const [imageFit, setImageFit] = React.useState<ImageFit | undefined>(
     'contain'
   );
@@ -96,11 +96,13 @@ export default function App() {
         placeholder="Page background color"
         value={backgroundColor}
         onChangeText={setBackgroundColor}
+        autoCapitalize="none"
       />
       <TextInput
         style={styles.input}
         placeholder="Image fit"
         defaultValue={imageFit}
+        autoCapitalize="none"
         onChangeText={(text) => {
           const f = text.toLowerCase();
           switch (f) {

ios/CreatePdfOptions.swift

@@ -18,10 +18,20 @@ struct Page: Decodable {
   let imageFit: ImageFit?
   let width: Double?
   let height: Double?
+  let backgroundColor: Int?
 }
 
-struct CreatePdfOptions: Decodable {
+class CreatePdfOptions: Decodable {
   let outputDirectory: String
   let outputFilename: String
   let pages: [Page]
+
+  init(_ options: NSDictionary) throws {
+    let jsonData = try JSONSerialization.data(withJSONObject: options, options: [])
+    let pdfCreateOptions = try JSONDecoder().decode(CreatePdfOptions.self, from: jsonData)
+
+    self.outputDirectory = pdfCreateOptions.outputDirectory
+    self.outputFilename = pdfCreateOptions.outputFilename
+    self.pages = pdfCreateOptions.pages
+  }
 }

ios/ImagesPdf.swift

@@ -10,7 +10,7 @@ class ImagesPdf: NSObject {
   @objc
   func createPdf(_ options: NSDictionary, resolver resolve:RCTPromiseResolveBlock, rejecter reject: RCTPromiseRejectBlock) {
     do {
-      let createPdfOptions = try parseOptions(options: options)
+      let createPdfOptions = try CreatePdfOptions(options)
 
       let outputDirectory = createPdfOptions.outputDirectory
       let outputFilename = createPdfOptions.outputFilename
@@ -78,6 +78,13 @@ class ImagesPdf: NSObject {
           let pageBounds = CGRect(x: 0, y: 0, width: width, height: height)
           context.beginPage(withBounds: pageBounds, pageInfo: [:])
 
+
+          if let backgroudColorInt = page.backgroundColor {
+            let backgroundColor = createUIColor(from: backgroudColorInt).cgColor
+            context.cgContext.setFillColor(backgroundColor)
+            context.cgContext.fill(pageBounds)
+          }
+
           var scaledImage: UIImage?
           if width != image.size.width || height != image.size.height {
             let fit = page.imageFit
@@ -163,11 +170,12 @@ class ImagesPdf: NSObject {
     return docsDir
   }
 
-  func parseOptions(options: NSDictionary) throws -> CreatePdfOptions {
-    let jsonData = try JSONSerialization.data(withJSONObject: options, options: [])
-
-    let pdfCreateOptions = try JSONDecoder().decode(CreatePdfOptions.self, from: jsonData)
+  func createUIColor(from color: Int) -> UIColor {
+    let red = CGFloat((color >> 16) & 0xFF) / 255.0
+    let green = CGFloat((color >> 8) & 0xFF) / 255.0
+    let blue = CGFloat(color & 0xFF) / 255.0
+    let alpha = CGFloat((color >> 24) & 0xFF) / 255.0
 
-    return pdfCreateOptions
+    return UIColor(red: red, green: green, blue: blue, alpha: alpha)
   }
 }