protocols

问题 I was able to find a lot of information about multipart/form-data but not much about multipart/related. In terms of the protocol / request format, can someone explain the differences between these two http specifications when it comes to file uploading? 回答1: multipart/form-data is used to upload files of MIME-compatible representation, such as pictures and video files, and related metadata a single POST request. That's what happens when you fill in a form online with attached pictures and

问题 Is it possible to have a protocol that specializes a generic protocol? I want something like this: protocol Protocol: RawRepresentable { typealias RawValue = Int ... } This does compile, but when I try to access the init or rawValue from a Protocol instance, its type is RawValue instead of Int . 回答1: In Swift 4, you can add constraints to your protocol: protocol MyProtocol: RawRepresentable where RawValue == Int { } And now all methods defined on MyProtocol will have an Int rawValue. For

问题 SWIFT / IOS 8.2 I am trying to set my CalculatorViewController as the delegate target so I can get data - but I seem to be setting it wrong: "EXC_BAD_ACCESS (code:2)" (in GraphView.swift) protocol CalculatorViewDataSource: class { func calculateYForXEquals(sender: CalculatorViewController, currentX: CGFloat) ->CGFloat? } class GraphView: UIView { weak var calculatorViewDataSource: CalculatorViewDataSource? //... } (in GraphViewController.swift) class GraphViewController: UIViewController {

问题 I am trying to save a configuration data structure with UserDefaults , thus the data structure needs to conform to the Codable protocol. This is my data structure: // Data structure which saves two objects, which conform to the Connection protocol struct Configuration { var from: Connection var to: Connection } protocol Connection: Codable { var path: String { get set } } // Two implementations of the Connection protocol struct SFTPConnection: Connection, Codable { var path: String var user:

问题 I need to set protocol function in Alamofire download function to track and observe progress fraction value. I have to tried to implement delegate function but its not properly executes giving error. I have one DataProvider class which has Alamofire function and then I am calling this in ViewController. Errors getting on init(webService: DataProvider = DataProvider()) : 'self' used before 'super.init' call 'super.init' isn't called on all paths before returning from initializer ViewController

问题 I need to set protocol function in Alamofire download function to track and observe progress fraction value. I have to tried to implement delegate function but its not properly executes giving error. I have one DataProvider class which has Alamofire function and then I am calling this in ViewController. Errors getting on init(webService: DataProvider = DataProvider()) : 'self' used before 'super.init' call 'super.init' isn't called on all paths before returning from initializer ViewController

问题 So I have one UIViewController and two SKScene s. The UIViewController present the two scenes by rotating the device; landscape load SKScene 1 and portrait load SKScene 2 lie this: override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) { print("TRIGGERED") if UIDevice.current.orientation.isLandscape { print("Landscape") presentView(name: "GameScene") } else { print("Portrait") presentView(name: "GameScene2") } super.viewWillTransition(to:

问题 So I have one UIViewController and two SKScene s. The UIViewController present the two scenes by rotating the device; landscape load SKScene 1 and portrait load SKScene 2 lie this: override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) { print("TRIGGERED") if UIDevice.current.orientation.isLandscape { print("Landscape") presentView(name: "GameScene") } else { print("Portrait") presentView(name: "GameScene2") } super.viewWillTransition(to:

问题 I'm trying to find a suitable protocol middleware for my next distributed application. I've found several specifications in the last few days and was wondering if I missed an important one? It should be a binary protocol, support RPCs and optionally have open-source implementations in different languages. Here's the list of protocols I found: CORBA ICE AMQP Thrift And this is the list of dismissed protocols: XML based protocols because they are text based (XML-RCP, SOAP, hand-rolled, etc.)

问题 I'm trying to find a suitable protocol middleware for my next distributed application. I've found several specifications in the last few days and was wondering if I missed an important one? It should be a binary protocol, support RPCs and optionally have open-source implementations in different languages. Here's the list of protocols I found: CORBA ICE AMQP Thrift And this is the list of dismissed protocols: XML based protocols because they are text based (XML-RCP, SOAP, hand-rolled, etc.)