Capturing window.print() from a WKWebView
Figured it out just after posting (obviously)... Hopefully this helps someone else.
When creating your web view...
let configuration = WKWebViewConfiguration()
let script = WKUserScript(source: "window.print = function() { window.webkit.messageHandlers.print.postMessage('print') }", injectionTime: WKUserScriptInjectionTime.AtDocumentEnd, forMainFrameOnly: true)
configuration.userContentController.addUserScript(script)
configuration.userContentController.addScriptMessageHandler(self, name: "print")
self.webView = WKWebView(frame: CGRectZero, configuration: configuration)
Then just adopt the WKScriptMessageHandler protocol in your view controller and add the required method...
func userContentController(userContentController: WKUserContentController, didReceiveScriptMessage message: WKScriptMessage) {
if message.name == "print" {
printCurrentPage()
} else {
println("Some other message sent from web page...")
}
}
func printCurrentPage() {
let printController = UIPrintInteractionController.sharedPrintController()
let printFormatter = self.webView.viewPrintFormatter()
printController?.printFormatter = printFormatter
let completionHandler: UIPrintInteractionCompletionHandler = { (printController, completed, error) in
if !completed {
if let e = error? {
println("[PRINT] Failed: \(e.domain) (\(e.code))")
} else {
println("[PRINT] Canceled")
}
}
}
if let controller = printController? {
if UIDevice.currentDevice().userInterfaceIdiom == .Pad {
controller.presentFromBarButtonItem(someBarButtonItem, animated: true, completionHandler: completionHandler)
} else {
controller.presentAnimated(true, completionHandler: completionHandler)
}
}
}