Printing the view in iOS with Swift

问题

I am developing an app which requires visitor passes to be generated and printed directly from an iPad over AirPrint.

I have looked everywhere to find out how to print a view but I can only find how to print text, webKit and mapKit.

Is there a way of printing an entire view? If not, what would be a good solution to print a visitor pass which will be plain text, boxes and a photograph. Thanks.

回答1:

I have found the answer to my question by modifying the code found here: AirPrint contents of a UIView

//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()

    // If you want to specify a printer
    guard let printerURL = URL(string: "Your printer URL here, e.g. ipps://HPDC4A3E0DE24A.local.:443/ipp/print") else { return }
    guard let currentPrinter = UIPrinter(url: printerURL) else { return }                     

    printController.print(to: currentPrinter, completionHandler: nil)

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

回答2:

I think you have to look print photo sample code with Swift: https://developer.apple.com/library/ios/samplecode/PrintPhoto/Introduction/Intro.html

What exactly is your view, imageView or UIView? If you are interested in imageView or UIImage, Print Photo sample from Apple is for you. If your subject is UIView you can create pdf context from view.layers and send to AirPrint func like WebKit, text or you can print to create pdf data.

The best solution is Create Pdf file is in here for swift Generate PDF with Swift

Print pdf file is for swift implementation:

var pdfLoc = NSURL(fileURLWithPath:yourPdfFilePath)
let printController = UIPrintInteractionController.sharedPrintController()!
let printInfo = UIPrintInfo(dictionary:nil)!

printInfo.outputType = UIPrintInfoOutputType.General
printInfo.jobName = "print Job"
printController.printInfo = printInfo
printController.printingItem = pdfLoc
printController.presentFromBarButtonItem(printButton, animated: true, completionHandler: nil)

回答3:

Hier in Swift 3.x

 func prt() {

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

        // Set up print controller
        let printController = UIPrintInteractionController.shared
        printController.printInfo = printInfo

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

        // Do it
        printController.present(from: self.view.frame, in: self.view, animated: true, completionHandler: nil)

    }

}

extension UIView {
    func toImage() -> UIImage {
        UIGraphicsBeginImageContextWithOptions(bounds.size, false, UIScreen.main.scale)

        drawHierarchy(in: self.bounds, afterScreenUpdates: true)

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

回答4:

Swift 4:

        let printInfo = UIPrintInfo(dictionary:nil)
        printInfo.outputType = UIPrintInfo.OutputType.general
        printInfo.jobName = "iOS app printing"

        let printController = UIPrintInteractionController.shared
        printController.printInfo = printInfo

        printController.printingItem = UIImage.imageFromView(self.view) // your view here

        printController.present(from: self.view.frame, in: self.view, animated: true, completionHandler: nil)

extension UIImage {

    /// Get image from given view
    ///
    /// - Parameter view: the view
    /// - Returns: UIImage
    public class func imageFromView(view: UIView) -> UIImage {
        UIGraphicsBeginImageContextWithOptions(view.frame.size, false, 0)
        view.drawHierarchy(in: view.bounds, afterScreenUpdates: false)

        let image: UIImage = UIGraphicsGetImageFromCurrentImageContext()!
        UIGraphicsEndImageContext()
        return image
    }
}

来源：https://stackoverflow.com/questions/34206207/printing-the-view-in-ios-with-swift

标签

ios

swift

printing

airprint