swift3

问题 I want to know how to read from a txt file and print out specific parts of the file? For example, "test.txt" will contain: '''Jason 16 male self programing Josh 15 male friend art''' So I am looking for a way to print each word and line separately. Such as only printing: "Jason" "Jason is 16" "Josh likes art" This is what I got so far from searching around if let filepath = Bundle.main.path(forResource: "test", ofType: "txt") { do { let contents = try String(contentsOfFile: filepath) print

问题 It just occurred to me that when working with subsequences in Swift, func suffix(from: Int) seems to be identical to just dropFirst(_:) (Obviously, you just change the input value from say "3" to "7" in the case of an array of length "10".) Just to repeat that. So: of course, for an array of say length ten. What I mean is func suffix(from: Int) with "2" would be the same as dropFirst(_:) with "8" , for example. Similarly upTo / through seem to be identical to dropLast(_:) Other than

问题 Is there any way in Xcode 8 or 8.1 to do a Swift 2.X -> Swift 3 migration for a single file in a project that's already been converted to Swift 3? For technical debt/legacy build process reasons, we are currently having to maintain both Xcode 7 and Xcode 8 versions of our project. This is causing headaches when we have to merge new development from Xcode 7 over to Xcode 8 . Since the project has already been fully converted to Swift 3 in our Xcode 8 branch (including a ton of hand fixes), we

问题 I have a tableviewcontroller named DetailTableViewController and I need to pass data to next tableviewcontroller named DetailTableViewController. But I need to pass the data as the user clicks the cell of DetailTableViewController. Then, I got error as "unexpectedly found nil while unwrapping an Optional value".Please help me sort out in Swift 3. 回答1: First create a variable in your detail view controller to hold the value which you send from first view controller. then assign the value

问题 So I'm working on an iOS 10 app using Swift 3 and Xcode 8.3.3. In my app I have to take successively 8 pictures with indicators on the camera. So I'm using AVCaptureVideoPreviewLayer for the custom camera and I need to set the view displaying the camera on landscape mode. I did it using this extension that I found on stackoverflow while searching for the problem. struct AppUtility { static func lockOrientation(_ orientation: UIInterfaceOrientationMask) { if let delegate = UIApplication.shared

问题 I'm trying to build a protocol exposing a static property, then use that static property in an extension of that protocol, but it seems to work only if I define this static property in the protocol extension as well. Basically the code I'm trying to get to work: protocol NibInstantiable: class { static var bundle: Bundle? { get } static var nibName: String { get } } extension NibInstantiable where Self: UIViewController { // static var nibName: String { // return "" // } static func

问题 You can view this project on github here: https://github.com/Lkember/MotoIntercom/ The class that is of importance is PhoneViewController.swift I have an AVAudioPCMBuffer. The buffer is then converted to NSData using this function: func audioBufferToNSData(PCMBuffer: AVAudioPCMBuffer) -> NSData { let channelCount = 1 let channels = UnsafeBufferPointer(start: PCMBuffer.floatChannelData, count: channelCount) let data = NSData(bytes: channels[0], length:Int(PCMBuffer.frameCapacity * PCMBuffer

问题 I have created a very simple app with one route in main.swift . It reads a city from a query string and use it to get the weather (through the yahoo API) of that city. this is the route: drop.get("whether") { request in guard let city = request.data["city"]?.string else { return try JSON(node: ["Error": "no city given"]) } return try drop.client.get("https://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20weather.forecast%20where%20woeid%20in%20(select%20woeid%20from%20geo.places(1)

问题 I tried to give the height and width for collectionViewCell , programatically. I used following method: func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize { let viewWidth = self.deviceWidth/3 - 5 let viewHeight = viewWidth return CGSize(width :100,height: 100) } This didn't work. even this method didn't show as a hint. Help me with this. Is there any other delegate method to set the cell

问题 I have a node object in 3d view and i need to drag that object, So far i have tried from here : Placing, Dragging and Removing SCNNodes in ARKit and converted in swift @objc func handleDragGesture(_ gestureRecognizer: UIGestureRecognizer) { let tapPoint = gestureRecognizer.location(in: self.sceneView) switch gestureRecognizer.state { case .began: print("Object began to move") let hitResults = self.sceneView.hitTest(tapPoint, options: nil) if hitResults.isEmpty { return } let hitResult =