Recent questions tagged Swift

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swift - Can't hook up an outlet collection in Xcode 6 using storyboard

I am having trouble creating an outlet collection in Xcode 6. Outlet collections in Xcode 6 now function as ... my view controller swift file? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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523 views

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swift - Is there a way to find actual SwiftUI API Documentation (and not just the developer documentation)?

I'm currently watching the SwiftUI Essentials video from WWDC 2019 and the presenter pulled up the actual API ... development overall. Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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782 views

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swift - Accessing AppState in AppDelegate with SwiftUI's new iOS 14 life cycle

I'm using SwiftUI's new app lifecycle coming in iOS 14. However, I'm stuck at how to access my AppState ( ... to use the old UIKit lifecycle? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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swift - CVPixelBufferPool Error ( kCVReturnInvalidArgument/-6661)

I've implemented previous suggestions with Swift (How to use CVPixelBufferPool in conjunction with ... ) } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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618 views

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swift - Create NSManagedObject Subclass... make a new Error in my project

i want to add a class for my entity by EditorCreate NSManagedObject Subclass... menu . but when i added it , ... develope it with xcode 10 now See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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664 views

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swift - Why can not use protocol `Encodable` as a type in the func

I'm trying to get data by encode model which conforms to Encodable protocol. But it's failed to invoke func ... .test() } logItem(dataSource1!) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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swift - Cannot convert value of type '[String : AnyObject]?' to expected argument type '[NSAttributedStringKey : Any]?'

How to convert values of type '[String : AnyObject]?'to expected argument type '[NSAttributedStringKey : ... ) NSUIGraphicsPopContext() } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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645 views

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swift - Xcode Beta 6 "Type of expression is ambiguous without more context" navigationlink

Since updating to Xcode Beta 6 earlier today my application will no longer build, it was working fine in Beta 5 and ... ) in Text(job.jobName) } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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714 views

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swift - How to apply audio effect to a file and write to filesystem - iOS

I'm building an app that should allow user to apply audio filters to a recorded audio, such as Reverb, ... any suggestions for further research. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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718 views

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swift - Getting the most frequent value of an array

I have an Array of numbers and I want to know which number is most frequent in this array. The array ... integer in an array of integers? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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701 views

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swift - How do I create an array of tuples?

I'm trying to create an array of tuples in Swift, but having great difficulty: var fun: (num1: Int, num2: Int)[] = ... var foo: Int[] = Int[]() See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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swift - SwiftUI call function on variable change

I am trying to convert a view of my watchOS App to Swift UI. I wanted to port the volume control that can be ... :)) Here's the current view: See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.4k views

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swift - SwiftUI hide TabBar in subview

I am working with SwiftUI, and I have some issues with the TabBar. I want to hide the TabBar on a specific ... a solution for this? Thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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671 views

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swift - Drag Rotate a Node around a fixed point

I'm trying to create a spinable node similar to the "prize wheel" in this question. So far I ... mostRecentTouchLocation = CGPointZero } } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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691 views

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swift - @objc keyword extension subclass behaviour

Can someone explain why @objc keyword is needed here to compile the code? As I understood this keyword is used in ... well as dynamic? Or not? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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940 views

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swift - ios Charts 3.0 - Align x labels (dates) with plots

I am having a hard time to migrate library Charts (from Daniel Gindi) from version 2 (Swift 2.3) to 3 ( ... is not good. Thanks for your help See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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712 views

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swift - iOS tap to focus

I used this code to achieve Tap-to-Focus in iOS custom camera App, but it isn't working. Here's the ... device.unlockForConfiguration() } } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.6k views

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swift - How to disable vertical scroll in TabView with SwiftUI?

I have set up a TabView in my application, so that I can swipe horizontally between multiple pages, but I also have ... : .never)) } } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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745 views

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swift - SCNCamera limit arcball rotation

I have a scene setup with SCNCamera that rotates around an object. What would be the best way to limit the extents ... = heightRatio % 1 } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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904 views

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swift - Group elements of an array by some property

I have an array of objects with property date. What I want is to create array of arrays where each array will ... objects with the same date ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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942 views

1 answer

swift - Add @Published behaviour for computed property

I am trying to make a ObservableObject that has properties that wrap a UserDefaults variable. In order to ... to achieve @Published behaviour? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

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swift - iOS - WKWebView Cross origin requests are only supported for HTTP

Hi i'm trying to load an html that is in the main Bundle with WKWebView this worked perfectly with ... ) self.view.addSubview(vistaweb) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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711 views

1 answer

swift - Firebase converting snapshot value to objects

So I have a postDict as [String: AnyObject] and I have a model class Post. Is there a quick way to ... the output when printing out postDict: See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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808 views

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swift - Why non optional Any can hold nil?

In Swift I can declare a constant of type Any and put a String into it. let any: Any = "hello world" Good. On ... Playground 7.2 + Swift 2.1.1 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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637 views

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swift - How to require that a protocol can only be adopted by a specific class

I want this protocol: protocol AddsMoreCommands { /* ... */ } only to be adopted by classes that inherit from the ... a way to do this? Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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932 views

1 answer

swift - ARKit – Get current position of ARCamera in a scene

I'm in the process of learning both ARKit and Scenekit concurrently, and it's been a bit of a challenge. With ... them) Thanks for any help. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.5k views

1 answer

swift - 'Use of self in method call before super.init initializes self', can't init properties through a method call

I'm curious is there is anyway to call a method inside your init method that sets instance properties of the class ... .init(frame : frame) } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.7k views

1 answer

swift - 'self' captured by a closure before all members were initialized

Alright, so just to start off, heres my code: import UIKit import ForecastIO class Weather { var temp: Float ... 'm doing this entirely wrong? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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