nsprintoperation - 检查哪些用户已选择

Question

与此代码我可以打印PDF文件：

let dictDocuments = NSURL(fileURLWithPath: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]) 
let completePath = dictDocuments.appendingPathComponent("test.pdf") 
let pdfDocument = PDFDocument(url: completePath!) 

let printInfoDict = NSMutableDictionary(dictionary: NSPrintInfo.shared().dictionary()) 
printInfoDict.setObject(NSPrintSpoolJob, forKey: NSPrintJobDisposition as NSCopying) 
let printInfo = NSPrintInfo(dictionary: printInfoDict as! [String : Any]) 
printInfo.isHorizontallyCentered = true 
printInfo.isVerticallyCentered = true 
printInfo.scalingFactor = 1.5 


let printOp = pdfDocument!.printOperation(for: printInfo, scalingMode: .pageScaleNone, autoRotate: true)! 
printOp.runModal(for: self.view.window!, delegate: self, didRun: nil, contextInfo: nil) 

我可以检查，用户在打印面板选择了哪个按钮？ （取消或打印）

Answer 1

从documentation

的方法，由didRunSelector参数指定必须具有以下特征：

func printOperationDidRun(_ printOperation NSPrintOperation, success: Bool, contextInfo: UnsafeMutableRawPointer?) 

成功的值是true如果打印操作跑到无需取消或错误完成，否则返回false。

如果您发送canSpawnSeparateThread到NSPrintOperation物体的true参数，然后在runOperationModalForWindow:delegate:didRunSelector:contextInfo:后续调用中指定的代表可在催生，非主线程传递消息。