swift3

问题 This question already has answers here : Why do closures require an explicit `self` when they're all non-escaping by default in Swift 3? (2 answers) Closed 3 years ago . I have a function which looks something like this: func test(closure: () -> ()) { let localClosure = { closure() } localClosure() } This is only an example and does not fully reflect the problem I encountered, obviously here I could have just called closure directly! It should be clear that in the above code, closure cannot

问题 I'm using a UIAlertController to present the user with a dialog to enter a 5 digit CRN . I want the Add button to be disabled until there are 5 and only 5 digit in the UITextField . Here's what the UI looks like : Here's the properties setup for the UIAlertController : var alertController: UIAlertController! var addAlertAction: UIAlertAction! { return UIAlertAction(title: "Add", style: .default) } Here's how I'm initializing them in the viewDidLoad method : self.alertController =

问题 My Xcode has been recently updated to Xcode 8 with Swift 3. What I have noticed is that when attaching actions to ViewController functions are generated in this style: @IBAction func methodName(_ sender: UIButton) { } I don't understand what is the purpose of having _ there. Could anyone explain why it is there? In previous Swift 2.2 it was not there. Another question is that previous project I have done by watching tutorial has migrated to Swift 3, and there was one method which looked like

问题 {"title":"exampleTitle","hashTags":[{"name":"tag1"},{"name":"tag2"}],"uploadFiles": [{"fileBytes":"seriesOfBytes\n","filename":"upload.txt"}]} That is my desired body I want to send to the backend. I'm using Swift 3.0 and Alamofire 4 and i have multiple questions. first , How do i correctly create a body which contains values and arrays of values? My approach is: let para:NSMutableDictionary = NSMutableDictionary() para.setValue("exampleTitle", forKey: "title") let jsonData = try!

问题 I was trying to figure out how to create a custom view using xib files. In this question the next method is used. NSBundle.mainBundle().loadNibNamed("CardView", owner: nil, options: nil)[0] as! UIView Cocoa has the same method,however, this method has changed in swift 3 to loadNibNamed(_:owner:topLevelObjects:), which returns Bool , and previous code generates "Type Bool has no subscript members" error, which is obvious, since the return type is Bool. So, my question is how to a load view

问题 I've found it remarkably difficult to find "working documentation" for using Sequence / IteratorProtocol in Swift 3. The few tutorials/articles out there seem to be for older Swift. Imagine a toy doubly-linked list class called DLList ... public class Node { // whatever "thing" you have a group of, this is that "thing" } public class DLList { // toy linked list class here // so this is a group of "node" in this example } I believe the following represents the simplest (?), correct, way to

问题 I am facing an issue with the SFSpeechRecognizer . After few seconds of starting the application I start getting the error Error Domain=kAFAssistantErrorDomain Code=209 "(null)"" and "Error Domain=kAFAssistantErrorDomain Code=203 "Timeout" UserInfo={NSLocalizedDescription=Timeout, NSUnderlyingError=0x170049990 {Error Domain=SiriSpeechErrorDomain Code=100 "(null)"}} and the application stops recognization. I am trying to endAudio() and then again start it every 20 seconds as Apple does not

问题 I am trying to localize my app using Swift 3 and Xcode 8.1. I am trying to localze the app using both storyboard(main.strings(German)) and programatically using "NSLocalizedString" . I am able to localize programatically using "NSLocalizedString" using following code func localized(lang:String) ->String { let path = Bundle.main.path(forResource: lang, ofType: "lproj") let bundle = Bundle(path: path!) return NSLocalizedString(self, tableName: nil, bundle: bundle!, value: "", comment: "") } But

问题 How can I save a photo to photo library with geolocation metadata? I have requested (and allowed) the app to access user location: private func allowAccessToUserLocation() { locationManager = CLLocationManager() locationManager.delegate = self locationManager.requestWhenInUseAuthorization() } Do I need to ask for specific premissions for the camera app? EDIT: I use UIImagePickerController to take photos from within the app. All photos taken from within the app are stored in the photo library

问题 I wanted to update the naming of the following method for Swift 3: public func imageWithUrl(url: String, placeholderNamed: String) { if let image = UIImage(named: placeholderNamed) { imageWithUrl(url: url, placeholder: image) } else { imageWithUrl(url: url) } } to public func image(url: String, placeholderNamed: String) { So I deprecated the old method with this: @available(*, deprecated: 1.8, renamed: "image(url:, placeholder:") The problem is that I'm getting the following error: 'renamed'