swift3

问题 Consider the following code: typealias PersonRecord = [String : AnyObject] struct Person { let name: String let age: Int public init(name: String, age: Int) { self.name = name self.age = age } } extension Person { init?(record : PersonRecord) { guard let name = record["name"] as? String, let age = record["age"] as? Int else { return nil } self.name = name self.age = age } } Now I want to create an array of Person s from an array of Record s: let records = // load file from bundle let persons

问题 I would like to add space to the left of the bar button. So, I add this code. navbar.autoresizingMask = [.flexibleWidth, .flexibleBottomMargin, .flexibleRightMargin] navbar.delegate = self UINavigationBar.appearance().barTintColor = UIColor(red: 0.0/255.0, green:49.0/255.0, blue:79.0/255.0, alpha:0.1) UINavigationBar.appearance().tintColor = UIColor.white UINavigationBar.appearance().isTranslucent = true UINavigationBar.appearance().titleTextAttributes = [NSForegroundColorAttributeName :

问题 I'm scanning a QR-Code with chinese characters encoded in Big5. (主页概况) Is there a chance to get this String decoded correctly in Swift 3? I found this Objective-C example on GitHub and this SO question, but there are no kCFStringEncodingBig5_HKSCS_1999 and kCFStringEncodingBig constants in Swift. Update: I found the corresponding swift variables, so i now tried the following: func captureOutput(_ captureOutput: AVCaptureOutput!, didOutputMetadataObjects metadataObjects: [Any]!, from

问题 I am trying to make a numbered list out of the information the user inputs into a UITextView. For example, List item one List item two List item three Here is the code that I have tried but does not give me the desired effect. var currentLine: Int = 1 func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool { // Add "1" when the user starts typing into the text field if (textView.text.isEmpty && !text.isEmpty) { textView.text = "\

问题 I am creating a custom camera with filters. When I add the following line it crashes without showing any exception. //Setting video output func setupBuffer() { videoBuffer = AVCaptureVideoDataOutput() videoBuffer?.alwaysDiscardsLateVideoFrames = true videoBuffer?.videoSettings = [(kCVPixelBufferPixelFormatTypeKey as NSString): NSNumber(value: kCVPixelFormatType_32RGBA)] videoBuffer?.setSampleBufferDelegate(self, queue: DispatchQueue.main) captureSession?.addOutput(videoBuffer) } public func

问题 I have in app: TextView and TableView. I create their in code. And now I need to make programming autolayout. But I don't know how it make. Please help. P.S. Sorry for my English =) let displayWidth: CGFloat = self.view.frame.width let displayHeight: CGFloat = self.view.frame.height myTextView = UITextView(frame: CGRect(x: 0, y: 20, width: displayWidth, height: displayHeight / 3)) creatTextView() myTableView = UITableView(frame: CGRect(x: 0, y: displayHeight / 3, width: displayWidth, height:

问题 I put label inside table cell. I changed the text color into "White" in Attributes inspector. I also changed the label background color into "Green". When I run the app, the text color does not change into white color but background changed to green. I also put the code. cell.lblName.textColor = UIColor.white I declare this @IBOutlet weak var lblAllowAutoRenew: UILabel! in MediaPackListCell.swift file. In TableView.swift , func tableView(_ tableView: UITableView, cellForRowAt indexPath:

问题 I have draw the polylines, but I don't no that what coding can remove the tracked polyline in the google map. I'm trying some coding in below. this is no working. var polyline = GMSPolyline() polyline.map = nil this is working to remove tracked polyline, but when I'm maked the markers and tap it, marker can not sow the info window. mapView.clear() Thank you 回答1: Solution: create polyline: teaching polyline by GoogleMapsAPIs create variable oldPolylineArr/oldPolyline type GMSPolyline

问题 I have done below code with Swift 2.2, but when switched to Swift 3.0 getting error at if condition "Binary operator '??' cannot be applied to operands of type 'AnyObject?' and 'String'" if let custID = dataDict["cust_id"] ?? "", let custName = dataDict["cust_name"] ?? "", let fileName = dataDict["filename"] ?? "", let transNumber = dataDict["trans_no"] ?? "" { linesheet_custID = (custID["text"] ?? "" ) as! String linesheet_custName = (custName["text"] ?? "" ) as! String linesheet_filename =

问题 Hey so I'm working on this little app and I let durationDateComponents = Calendar(identifier: Calendar.Identifier.gregorian).dateComponents([.year, .month, .day, .hour, .minute, .second], from: Date(), to: christmasDay, options: []) What do I do here? I get that the error is pointing me to change something with the array, but what? Thanks! 回答1: Remove options . That's not part of dateComponents and thus the compiler is having trouble identifying the method. let calendar = Calendar.current //