使用Swift在iOS中打印视图

//create an extension to covert the view to an image
extension UIView {
func toImage() -> UIImage {
    UIGraphicsBeginImageContextWithOptions(bounds.size,false,UIScreen.mainScreen().scale)

    drawViewHierarchyInRect(self.bounds,afterScreenUpdates: true)

    let image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    return image
}
}

//In your view controller    
@IBAction func printButton(sender: AnyObject) {

    let printInfo = UIPrintInfo(dictionary:nil)
    printInfo.outputType = UIPrintInfoOutputType.General
    printInfo.jobName = "My Print Job"

    // Set up print controller
    let printController = UIPrintInteractionController.sharedPrintController()
    printController.printInfo = printInfo

    // Assign a UIImage version of my UIView as a printing iten
    printController.printingItem = self.view.toImage()

    // Do it
    printController.presentFromRect(self.view.frame,inView: self.view,animated: true,completionHandler: nil)
}