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TMS iCL
Printing a PDF File

To print a pdf file from iOS, you can use the following code to access the UIPrintInteractionController (it requires MacApi.ObjectiveC, iOSApi.UIKit and iOSApi.Foundation units) 
type
  TUIPrintInteractionControllerCompletionHandler = procedure(printInteractionController: Pointer; 
    completed: Pointer; error: Pointer) of object;

  UIPrintInteractionControllerClass = interface(NSObjectClass)
    ['{D3566B82-3014-40C6-B7E3-DFC22AF39319}']
    {class} function canPrintData(data: NSData): Boolean; cdecl;
    {class} function canPrintURL(url: NSURL): Boolean; cdecl;
    {class} function isPrintingAvailable: Boolean; cdecl;
    {class} function printableUTIs: NSSet; cdecl;
    {class} function sharedPrintController: Pointer; cdecl;
  end;
  UIPrintInteractionController = interface(NSObject)
    ['{0FEF6AA7-132B-41C8-BB12-045C43027D4B}']
    function delegate: Pointer; cdecl;
    procedure dismissAnimated(animated: Boolean); cdecl;
    function printFormatter: UIPrintFormatter; cdecl;
    function printInfo: UIPrintInfo; cdecl;
    function printPageRenderer: UIPrintPageRenderer; cdecl;
    function printPaper: UIPrintPaper; cdecl;
    function printingItem: Pointer; cdecl;
    function printingItems: NSArray; cdecl;
    procedure setDelegate(delegate: Pointer); cdecl;
    procedure setPrintFormatter(printFormatter: UIPrintFormatter); cdecl;
    procedure setPrintInfo(printInfo: UIPrintInfo); cdecl;
    procedure setPrintPageRenderer(printPageRenderer: UIPrintPageRenderer); cdecl;
    procedure setPrintingItem(printingItem: Pointer); cdecl;
    procedure setPrintingItems(printingItems: NSArray); cdecl;
    procedure setShowsPageRange(showsPageRange: Boolean); cdecl;
    procedure presentAnimated(animated: Boolean; completionHandler: 
      TUIPrintInteractionControllerCompletionHandler); cdecl;
    function showsPageRange: Boolean; cdecl;
  end;
  TUIPrintInteractionController = class(TOCGenericImport<UIPrintInteractionControllerClass, 
    UIPrintInteractionController>)  end;

var
  pi: UIPrintInfo;
  pic: UIPrintInteractionController;
  fileURL: Pointer;
begin
  pi := TUIPrintInfo.Wrap(TUIPrintInfo.OCClass.printInfo);
  pi.setOutputType(UIPrintInfoOutputGeneral);
  pi.setJobName(TMSFMXNativeUIWebView1.WebView.request.URL.absoluteString);
  pi.setOrientation(UIPrintInfoOrientationPortrait);
  pi.setDuplex(UIPrintInfoDuplexLongEdge);

  pic := TUIPrintInteractionController.Wrap(TUIPrintInteractionController.OCClass.sharedPrintController);
  pic.setPrintInfo(pi);
  pic.setShowsPageRange(True);

  fileURL := TNSURL.OCClass.fileURLWithPath(NSSTR(ExtractFilePath(ParamStr(0))+'sample.pdf'));
  pic.setPrintingItem(fileURL);
  pic.presentAnimated(True, PrintCompleted); 
end;