swift3

问题 SWIFT 3.0 MKMAPVIEW iOS Note : - (Integrated AppleMap ,Not working with GoogleMap ) I have done the following : Implemented map and Added custom Image to User Location Annotation When map open , it shows User Location at right Place My Requirement : When User Move into different direction staying at same place (or different place) the pin (at current location) should automatically point the direction in which user points. E.g : If Boat is showing at User Location position and its pointing

问题 I'm testing this and it appears that if you change the value within didSet , you do not get another call to didSet . var x: Int = 0 { didSet { if x == 9 { x = 10 } } } Can I rely on this? Is it documented somewhere? I don't see it in the Swift Programming Language document. 回答1: I also thought, that this is not possible (maybe it wasn't in Swift 2), but I tested it and found an example where Apple uses this. (At "Querying and Setting Type Properties") struct AudioChannel { static let

问题 I am new to core data. What I am trying to DO: I am trying to create a cocoatouch framework that has an app to add employee details and display them in a table view. So that i can add this framework to my main project to work independently. Issues I face: The frame work builds without any error. I have added the core data stack from swift 3 to the framework. But when i run the main project, the moment the framework loads the log displays "Failed to load model named Simple framework", "fetch

问题 I know there's a bunch of pre Swift3 questions regarding NSData stuff. I'm curious how to go between a Swift3 String to a utf8 encoded (with or without null termination) to Swift3 Data object. The best I've come up with so far is: let input = "Hello World" let terminatedData = Data(bytes: Array(input.nulTerminatedUTF8)) let unterminatedData = Data(bytes: Array(input.utf8)) Having to do the intermediate Array() construction seems wrong. 回答1: It's simple: let input = "Hello World" let data =

问题 The following data in the Firebase Database: { "schedule": { "Week 1": { "active": "true" }, "Week 2": { "active": "true" }, "Week 3": { "active": "false" }, "Week 4": { "active": "true" }, ... } } I want to retrieve all the Weeks where the active is true only. I am setting the Firebase reference as such: ref = FIRDatabase.database().reference(withPath: "Schedule") and then doing the following: ref.observeSingleEvent(of: .value, with: { snapshot in // print("Count: ", snapshot.childrenCount)

问题 I pass a contact Identifier from Contacts tableview controller to another Location tableview controller. So I define a delegate ContactSelectionDelegate and implement method userSelectedContact in Location tableview controller and get contactIdentifierString I am searching the database to find a match for contactIdentifierString and find value for another attribute provider name. This involves searching the whole database. Is there a faster way by assigning a predicate to the context

问题 I pass a contact Identifier from Contacts tableview controller to another Location tableview controller. So I define a delegate ContactSelectionDelegate and implement method userSelectedContact in Location tableview controller and get contactIdentifierString I am searching the database to find a match for contactIdentifierString and find value for another attribute provider name. This involves searching the whole database. Is there a faster way by assigning a predicate to the context

问题 I'm having an issue with downsampling audio taken from the microphone. I'm using AVAudioEngine to take samples from the microphone with the following code: assert(self.engine.inputNode != nil) let input = self.engine.inputNode! let audioFormat = AVAudioFormat(commonFormat: .pcmFormatFloat32, sampleRate: 8000, channels: 1, interleaved: false) let mixer = AVAudioMixerNode() engine.attach(mixer) engine.connect(input, to: mixer, format: input.inputFormat(forBus: 0)) do { try engine.start() mixer

问题 I'm having an issue with downsampling audio taken from the microphone. I'm using AVAudioEngine to take samples from the microphone with the following code: assert(self.engine.inputNode != nil) let input = self.engine.inputNode! let audioFormat = AVAudioFormat(commonFormat: .pcmFormatFloat32, sampleRate: 8000, channels: 1, interleaved: false) let mixer = AVAudioMixerNode() engine.attach(mixer) engine.connect(input, to: mixer, format: input.inputFormat(forBus: 0)) do { try engine.start() mixer

问题 I want to add " Read more " at the end of the paragraph. When I click on the "Read more" text, it should be expand and display " Less " at the end. The texts will be collapsed when click on "Less" text. I find many sample work in google. But, I don't understand clearly and most projects are implemented with Objective-C. I also find it in youtube. I would like know very sample code to implement this with Swift 3 . Can I implement without using any additional library? Please help me. 回答1: