Add iOS Direct Print

 # Changelog
 
+## 2.1.7
+
+- Add iOS Direct Print
+
 ## 2.1.6
 
 - Add qrcode to example

@@ -26,8 +26,11 @@ class MyApp extends StatefulWidget {
 
 class MyAppState extends State<MyApp> {
   final GlobalKey<State<StatefulWidget>> shareWidget = GlobalKey();
+  final GlobalKey<State<StatefulWidget>> pickWidget = GlobalKey();
   final GlobalKey<State<StatefulWidget>> previewContainer = GlobalKey();
 
+  Printer selectedPrinter;
+
   Future<void> _printPdf() async {
     print('Print ...');
     final bool result = await Printing.layoutPdf(
@@ -50,6 +53,36 @@ class MyAppState extends State<MyApp> {
     );
   }
 
+  Future<void> _pickPrinter() async {
+    print('Pick printer ...');
+
+    // Calculate the widget center for iPad sharing popup position
+    final RenderBox referenceBox = pickWidget.currentContext.findRenderObject();
+    final Offset topLeft =
+        referenceBox.localToGlobal(referenceBox.paintBounds.topLeft);
+    final Offset bottomRight =
+        referenceBox.localToGlobal(referenceBox.paintBounds.bottomRight);
+    final Rect bounds = Rect.fromPoints(topLeft, bottomRight);
+
+    final Printer printer = await Printing.pickPrinter(bounds: bounds);
+
+    setState(() {
+      selectedPrinter = printer;
+    });
+
+    print('Selected printer: $selectedPrinter');
+  }
+
+  Future<void> _directPrintPdf() async {
+    print('Direct print ...');
+    final bool result = await Printing.directPrintPdf(
+        printer: selectedPrinter,
+        onLayout: (PdfPageFormat format) async =>
+            (await generateDocument(PdfPageFormat.letter)).save());
+
+    print('Document printed: $result');
+  }
+
   Future<void> _sharePdf() async {
     print('Share ...');
     final pdf.Document document = await generateDocument(PdfPageFormat.a4);
@@ -124,6 +157,22 @@ class MyAppState extends State<MyApp> {
               children: <Widget>[
                 RaisedButton(
                     child: const Text('Print Document'), onPressed: _printPdf),
+                Row(
+                  mainAxisSize: MainAxisSize.min,
+                  children: <Widget>[
+                    RaisedButton(
+                        key: pickWidget,
+                        child: const Text('Pick Printer'),
+                        onPressed: _pickPrinter),
+                    const SizedBox(width: 10),
+                    RaisedButton(
+                        child: Text(selectedPrinter == null
+                            ? 'Direct Print'
+                            : 'Print to $selectedPrinter'),
+                        onPressed:
+                            selectedPrinter != null ? _directPrintPdf : null),
+                  ],
+                ),
                 RaisedButton(
                     key: shareWidget,
                     child: const Text('Share Document'),

@@ -37,7 +37,9 @@ class PdfPrintPageRenderer: UIPrintPageRenderer {
         let page = pdfDocument?.page(at: pageIndex + 1)
         ctx?.scaleBy(x: 1.0, y: -1.0)
         ctx?.translateBy(x: 0.0, y: -paperRect.size.height)
-        ctx?.drawPDFPage(page!)
+        if page != nil {
+            ctx?.drawPDFPage(page!)
+        }
     }
 
     func cancelJob() {
@@ -79,4 +81,22 @@ class PdfPrintPageRenderer: UIPrintPageRenderer {
 
         return pages
     }
+
+    var pageArgs: [String: NSNumber] {
+        let width = NSNumber(value: Double(paperRect.size.width))
+        let height = NSNumber(value: Double(paperRect.size.height))
+        let marginLeft = NSNumber(value: Double(printableRect.origin.x))
+        let marginTop = NSNumber(value: Double(printableRect.origin.y))
+        let marginRight = NSNumber(value: Double(paperRect.size.width - (printableRect.origin.x + printableRect.size.width)))
+        let marginBottom = NSNumber(value: Double(paperRect.size.height - (printableRect.origin.y + printableRect.size.height)))
+
+        return [
+            "width": width,
+            "height": height,
+            "marginLeft": marginLeft,
+            "marginTop": marginTop,
+            "marginRight": marginRight,
+            "marginBottom": marginBottom,
+        ]
+    }
 }

@@ -35,10 +35,17 @@ public class SwiftPrintingPlugin: NSObject, FlutterPlugin, UIPrintInteractionCon
         registrar.addMethodCallDelegate(instance, channel: channel)
     }
 
-    public func handle(_ call: FlutterMethodCall, result: FlutterResult) {
+    public func handle(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
         let args = call.arguments! as! [String: Any]
         if call.method == "printPdf" {
-            printPdf(args["name"] as? String ?? "")
+            let name = args["name"] as? String ?? ""
+            printPdf(name)
+            result(NSNumber(value: 1))
+        } else if call.method == "directPrintPdf" {
+            let name = args["name"] as? String ?? ""
+            let printer = args["printer"] as? String
+            let object = args["doc"] as? FlutterStandardTypedData
+            directPrintPdf(name: name, data: object!.data, withPrinter: printer!)
             result(NSNumber(value: 1))
         } else if call.method == "writePdf" {
             if let object = args["doc"] as? FlutterStandardTypedData {
@@ -83,6 +90,13 @@ public class SwiftPrintingPlugin: NSObject, FlutterPlugin, UIPrintInteractionCon
                 andBaseUrl: args["baseUrl"] as? String == nil ? nil : URL(string: (args["baseUrl"] as? String)!)
             )
             result(NSNumber(value: 1))
+        } else if call.method == "pickPrinter" {
+            pickPrinter(result, withSourceRect: CGRect(
+                x: CGFloat((args["x"] as? NSNumber)?.floatValue ?? 0.0),
+                y: CGFloat((args["y"] as? NSNumber)?.floatValue ?? 0.0),
+                width: CGFloat((args["w"] as? NSNumber)?.floatValue ?? 0.0),
+                height: CGFloat((args["h"] as? NSNumber)?.floatValue ?? 0.0)
+            ))
         } else {
             result(FlutterMethodNotImplemented)
         }
@@ -102,6 +116,40 @@ public class SwiftPrintingPlugin: NSObject, FlutterPlugin, UIPrintInteractionCon
         renderer = nil
     }
 
+    func directPrintPdf(name: String, data: Data, withPrinter printerID: String) {
+        let printing = UIPrintInteractionController.isPrintingAvailable
+        if !printing {
+            let data: NSDictionary = [
+                "completed": false,
+                "error": "Printing not available",
+            ]
+            channel?.invokeMethod("onCompleted", arguments: data)
+            return
+        }
+
+        let controller = UIPrintInteractionController.shared
+        controller.delegate = self
+
+        let printInfo = UIPrintInfo.printInfo()
+        printInfo.jobName = name
+        printInfo.outputType = .general
+        controller.printInfo = printInfo
+        controller.printingItem = data
+        let printerURL = URL(string: printerID)
+
+        if printerURL == nil {
+            let data: NSDictionary = [
+                "completed": false,
+                "error": "Unable to fine printer URL",
+            ]
+            channel?.invokeMethod("onCompleted", arguments: data)
+            return
+        }
+
+        let printer = UIPrinter(url: printerURL!)
+        controller.print(to: printer, completionHandler: completionHandler)
+    }
+
     func printPdf(_ name: String) {
         let printing = UIPrintInteractionController.isPrintingAvailable
         if !printing {
@@ -212,4 +260,41 @@ public class SwiftPrintingPlugin: NSObject, FlutterPlugin, UIPrintInteractionCon
             }
         })
     }
+
+    func pickPrinter(_ result: @escaping FlutterResult, withSourceRect rect: CGRect) {
+        let controller = UIPrinterPickerController(initiallySelectedPrinter: nil)
+
+        let pickPrinterCompletionHandler: UIPrinterPickerController.CompletionHandler = {
+            (printerPickerController: UIPrinterPickerController, completed: Bool, error: Error?) in
+            if !completed, error != nil {
+                print("Unable to pick printer: \(error?.localizedDescription ?? "unknown error")")
+                result(nil)
+                return
+            }
+
+            if printerPickerController.selectedPrinter == nil {
+                result(nil)
+                return
+            }
+
+            let printer = printerPickerController.selectedPrinter!
+            let data: NSDictionary = [
+                "url": printer.url.absoluteString as Any,
+                "name": printer.displayName as Any,
+                "model": printer.makeAndModel as Any,
+                "location": printer.displayLocation as Any,
+            ]
+            result(data)
+        }
+
+        if UI_USER_INTERFACE_IDIOM() == .pad {
+            let viewController: UIViewController? = UIApplication.shared.keyWindow?.rootViewController
+            if viewController != nil {
+                controller.present(from: rect, in: viewController!.view, animated: true, completionHandler: pickPrinterCompletionHandler)
+                return
+            }
+        }
+
+        controller.present(animated: true, completionHandler: pickPrinterCompletionHandler)
+    }
 }

@@ -17,6 +17,7 @@
 library printing;
 
 import 'dart:async';
+import 'dart:io';
 import 'dart:typed_data';
 import 'dart:ui' as ui;
 

@@ -18,6 +18,24 @@ part of printing;
 
 typedef LayoutCallback = FutureOr<List<int>> Function(PdfPageFormat format);
 
+@immutable
+class Printer {
+  const Printer({
+    @required this.url,
+    this.name,
+    this.model,
+    this.location,
+  }) : assert(url != null);
+
+  final String url;
+  final String name;
+  final String model;
+  final String location;
+
+  @override
+  String toString() => name ?? url;
+}
+
 mixin Printing {
   static const MethodChannel _channel = MethodChannel('printing');
   static LayoutCallback _onLayout;
@@ -87,6 +105,61 @@ mixin Printing {
     return _onCompleted.future;
   }
 
+  /// Opens the native printer picker interface, and returns the URL of the selected printer.
+  static Future<Printer> pickPrinter({Rect bounds}) async {
+    if (!Platform.isIOS) {
+      return null;
+    }
+    _channel.setMethodCallHandler(_handleMethod);
+    bounds ??= Rect.fromCircle(center: Offset.zero, radius: 10);
+    final Map<String, dynamic> params = <String, dynamic>{
+      'x': bounds.left,
+      'y': bounds.top,
+      'w': bounds.width,
+      'h': bounds.height,
+    };
+    final Map<dynamic, dynamic> printer = await _channel
+        .invokeMethod<Map<dynamic, dynamic>>('pickPrinter', params);
+    print(printer);
+    if (printer == null) {
+      return null;
+    }
+    return Printer(
+      url: printer['url'],
+      name: printer['name'],
+      model: printer['model'],
+      location: printer['location'],
+    );
+  }
+
+  /// Prints a Pdf document to a specific local printer with no UI
+  ///
+  /// returns a future with a `bool` set to true if the document is printed
+  /// and false if it is canceled.
+  /// throws an exception in case of error
+  static Future<bool> directPrintPdf({
+    @required Printer printer,
+    @required LayoutCallback onLayout,
+    String name = 'Document',
+  }) async {
+    if (!Platform.isIOS || printer == null) {
+      return false;
+    }
+    _onCompleted = Completer<bool>();
+    _channel.setMethodCallHandler(_handleMethod);
+    final List<int> bytes = await onLayout(PdfPageFormat.standard);
+    if (bytes == null) {
+      return false;
+    }
+    final Map<String, dynamic> params = <String, dynamic>{
+      'name': name,
+      'printer': printer.url,
+      'doc': Uint8List.fromList(bytes),
+    };
+    await _channel.invokeMethod<int>('directPrintPdf', params);
+    return _onCompleted.future;
+  }
+
   /// Prints a [PdfDocument] or a pdf stream to a local printer using the platform UI
   @Deprecated('use Printing.layoutPdf(onLayout: (_) => document.save());')
   static Future<void> printPdf({

@@ -4,7 +4,7 @@ description: Plugin that allows Flutter apps to generate and print documents to
 homepage: https://github.com/DavBfr/dart_pdf/tree/master/printing
 repository: https://github.com/DavBfr/dart_pdf
 issue_tracker: https://github.com/DavBfr/dart_pdf/issues
-version: 2.1.6
+version: 2.1.7
 
 environment:
   sdk: ">=2.1.0 <3.0.0"