swift-playground

问题 I am unable to move my avatar in my gameScene at my defined speed(set at 40). It looks as if the avatar and the enemy is free floating in space. Here is my code- import SpriteKit public class GameScene: SKScene, SKPhysicsContactDelegate { let playerSpeed: CGFloat = 40.0 let coronaSpeed: CGFloat = 10.0 var mask: SKSpriteNode? var player: SKSpriteNode? var mcorona: [SKSpriteNode] = [] var lastTouch: CGPoint? = nil override public func didMove(to view: SKView) { physicsWorld.contactDelegate =

问题 I have code in my Sources/ directory in my Xcode Playground. I can reference them fine in my playground, but how do I allow them to reference each other? For example, suppose I have A.swift and B.swift files in the Sources/ directory. I would like to have A.swift access something from B.swift , but then I get an error saying that things from B.swift are undefined in A.swift . How can I accomplish this? 回答1: Add the public attribute to the classes, methods, and properties that you want to

问题 I was wondering how to get a dialog box to popup in Swift Playgrounds (yes must be in Playgrounds) I've tried the following code (directly from the AppleDevs site) However, no matter what I try, the self tag always throws an error. Can anyone help me with this? import UIKit let alert = UIAlertController(title: "My Alert", message: "This is an alert.", preferredStyle: .alert) alert.addAction(UIAlertAction(title: NSLocalizedString("OK", comment: "Default action"), style: .default, handler: { _

问题 I was wondering how to get a dialog box to popup in Swift Playgrounds (yes must be in Playgrounds) I've tried the following code (directly from the AppleDevs site) However, no matter what I try, the self tag always throws an error. Can anyone help me with this? import UIKit let alert = UIAlertController(title: "My Alert", message: "This is an alert.", preferredStyle: .alert) alert.addAction(UIAlertAction(title: NSLocalizedString("OK", comment: "Default action"), style: .default, handler: { _

问题 I was wondering how to get a dialog box to popup in Swift Playgrounds (yes must be in Playgrounds) I've tried the following code (directly from the AppleDevs site) However, no matter what I try, the self tag always throws an error. Can anyone help me with this? import UIKit let alert = UIAlertController(title: "My Alert", message: "This is an alert.", preferredStyle: .alert) alert.addAction(UIAlertAction(title: NSLocalizedString("OK", comment: "Default action"), style: .default, handler: { _

问题 I was wondering how to get a dialog box to popup in Swift Playgrounds (yes must be in Playgrounds) I've tried the following code (directly from the AppleDevs site) However, no matter what I try, the self tag always throws an error. Can anyone help me with this? import UIKit let alert = UIAlertController(title: "My Alert", message: "This is an alert.", preferredStyle: .alert) alert.addAction(UIAlertAction(title: NSLocalizedString("OK", comment: "Default action"), style: .default, handler: { _

来源： https://stackoverflow.com/questions/55303853/recursive-algorithm-is-much-slower-in-playgrounds-1-minute-than-xcode-0-1-sec

问题 Is it possible to use Swift Package Manager inside Xcode Playground ? 回答1: It is not possible to use the Swift Package Manager in a playground at this time. The reason for that is that the Swift Package Manager is primarily used outside of apple platforms. Apple mentions this on the Swift Package Manager's GitHub: Note that at this time the Package Manager has no support for iOS, watchOS, or tvOS platforms The Swift Package Manager is especially useful for writing Swift for platforms such as

问题 I'm experimenting code from https://alanquatermain.me/programming/swiftui/2019-11-15-CoreData-and-bindings/ my goal is to have DatePicker bind to Binding< Date? > which allow for nil value instead of initiate to Date(); this is useful, if you have Date attribute in your core data model entity which accept nil as valid value. Here is my swift playground code: extension Binding { init<T>(isNotNil source: Binding<T?>, defaultValue: T) where Value == Bool { self.init(get: { source.wrappedValue !=

问题 I'm experimenting code from https://alanquatermain.me/programming/swiftui/2019-11-15-CoreData-and-bindings/ my goal is to have DatePicker bind to Binding< Date? > which allow for nil value instead of initiate to Date(); this is useful, if you have Date attribute in your core data model entity which accept nil as valid value. Here is my swift playground code: extension Binding { init<T>(isNotNil source: Binding<T?>, defaultValue: T) where Value == Bool { self.init(get: { source.wrappedValue !=