Recent questions tagged Swift

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swift - using variables outside of completion block

Im currently retrieving data from firebase the data is put inside an NSObject and then a completion block. The item ... in print(error) } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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536 views

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swift - May I create an instance of a structure using a simple Int?

Is it right to make a structure's instance this way? public struct Barometer { public var pressure: Int public ... need to adopt a protocol? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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759 views

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swift - How to transpose an array more Swiftly?

I want to transpose an array of arrays like this: Original array: [ [1,2,3], [4,5,6], [7,8,9] ] ... be a simpler to do this with 2D arrays. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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swift - Knowing where retain cycles are and removing them

I was wondering if there was an easy way (or at least a way) to find out where retain cycles exist in ... his answer will help. Thanks @Sweeper! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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swift - What is the real benefit of using Raycast in ARKit and RealityKit?

What is a ray-casting in ARKit and RealityKit for? And when I need to use a makeRaycastQuery instance ... ARRaycastQuery? Any help appreciated. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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574 views

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swift - Self in init params

I would like to use Self in init parameters like so: class A { public init(finishBlock: ((_ operation: Self) ... () } Is this somehow possible? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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522 views

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swift - How do I design a simple Firebase Database that stores arrays?

I am in the midst of coding an IOS application using Xcode 8.2.1 in Swift. Currently, I have the database set ... you in advance for any help! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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538 views

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swift - How can I run through three separate arrays in the same for loop?

I have three arrays I am trying to run through and I want to use the values from all three arrays in one ... ? Any help is appreciated. Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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458 views

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swift - Reasons to include function in protocol definition vs. only defining it in the extension?

Take the following protocol and extension: protocol ProtocolA { func myFunc() } extension ProtocolA { func myFunc( ... any functionality at all? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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724 views

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swift - In SwiftUI, How do I increase the height of a button?

As you can see in the screenshot, the button height does not adjust to fit the text size, making it look ugly. How can I ... /4)-16) } } } } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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501 views

1 answer

swift - Change the value that is being set in variable's willSet block

I'm trying to sort the array that is being set before setting it but the argument of willSet is immutable and ... sort is trying to mutate it. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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645 views

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swift - Any when decoding JSON with Codable?

With Swift 3 JSONSerialization, if a part of your data model was completely dynamic, you could always just leave ... there any solution to this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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746 views

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swift - Remove element from collection during iteration with forEach

Recently, I wrote this code without thinking about it very much: myObject.myCollection.forEach { myObject.removeItem($0) ... it isn't crashing? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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527 views

1 answer

swift - How to do something(for example: print("hi")) in NavigationLink before moving to a destinationView

I am trying to create a button an want to do some stuff before navigating to another view. But if I ... .foregroundColor(Color("GreyLabel0")) } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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611 views

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swift - Result of call to [myFunction] is unused

In Obj-C, a common practice was to use convenience functions to perform common operations, like ... makeConstraint(withAnotherView: view2) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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646 views

1 answer

swift - UIBezierPath doesn't work in TopRight corner and BottomRight corner

I want to round my right corners, but only works for Left corners let path = UIBezierPath(roundedRect: view ... view.layer.masksToBounds = true See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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630 views

1 answer

swift - Testing if an element is visible with Xcode 7 UITest

I want to verify if an element is visible or not depending on its .hidden property but I don't find a ... verify the "hidden" property value? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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444 views

1 answer

swift - Checking if an array of custom objects contain a specific custom object

say i have a very simple Person class class Person { var name:String init(name:String) { self.name = name } ... (Person) throws -> Bool'" See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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484 views

1 answer

swift - Operation on an array of structs implementing Equatable

I have an array of different structs, all implementing Equatable protocol and am trying to pass it to a function ... 'T' could not be inferred See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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448 views

1 answer

swift - IPv6 - Apple rejects iOS app because of not Supporting IPv6 DNS64 / NAT64 Networks

Where is the error? Apple reject app and sent messege: Performance - 2.1 We discovered one or more bugs ... got the following results: Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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616 views

1 answer

swift - Reference cycles with value types?

Reference cycles in Swift occur when properties of reference types have strong ownership of each other (or with closures). ... otherA = A() } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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804 views

1 answer

swift - New Line Command ( ) Not Working With Firebase Firestore Database Strings

I'm making an app with Swift and I'm using Firebase Firestore. Firestore is a database that has some strings that I ... "] as? String)! } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.6k views

1 answer

swift - iOS TableView reload and scroll top

the second day I can not solve the problem with the table. We have a segmentedControl which, when changed ... Congrats on the upcoming holidays! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

605 views

1 answer

swift - How to improve People Occlusion in ARKit 3.0

We are working on a demo app using people's occlusion in ARKit. Because we want to add videos in the final ... SCNBox does not fix the problem. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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603 views

1 answer

swift - Displaying Artwork for .MP3 file

I am trying to currently display the album artwork for a locally stored .MP3 track in an ImageView. Does ... commonKey for "artwork". Thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

745 views

1 answer

swift - CoreData and SwiftUI: Context in environment is not connected to a persistent store coordinator

I am trying to teach myself Core Data by building a homework managing app. My code builds fine and the ... window.makeKeyAndVisible() } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

639 views

1 answer

swift - How to remove "row" separators/dividers from a List in SwiftUI?

I'm trying to remove the "row" separators (known as dividers in SwiftUI) from a List in SwiftUI. I went ... . Any help would be appreciated. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

647 views

1 answer

swift - How do I programmatically move an ARAnchor?

I'm trying out the new ARKit to replace another similar solution I have. It's pretty great! But I ... surface (ARHitTestResult). Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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