Recent questions tagged Swift

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SwiftUI Custom Button in List I'm trying to create a custom button in a SwiftUI List. I want it to have a ... some View { ExampleView() } } See Question&Answers more detail:os...

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

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610 views

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swift - split now complains about missing "isSeparator"

After the latest upgrade of Swift 1.2, I can't figure out how to split a line of text into words. I used ... the correct secret sauce for 1.2? See Question&Answers more detail:os...

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

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668 views

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swift - Why isn't guard let foo = foo valid?

In Swift, you can use if let optional binding to unwrap an optional into a constant or variable with the ... better place for this question. 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 - binary operator '/' cannot be applied to two 'Double' operands

While trying to execute this block of code in Swift 3, I encountered the error: binary operator '/' cannot be ... the first block of code work? See Question&Answers more detail:os...

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

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671 views

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swift - How to split a string into substrings of equal length

So split("There are fourty-eight characters in this string", 20) should return ["There are fourty-eig", ... {currentIndex = string.endIndex} See Question&Answers more detail:os...

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

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782 views

1 answer

swift - how to make alamofire download progress run in background ios?

I am using Alamofire to download data How to make alamofire run download in background with swift? 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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834 views

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swift - Apply a shadow on a UIView that have same corner radius than view

Hello i have some views with rounded corners, and I'd like to apply a shadow to this views. SO first I ... The shadow is not rounded 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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752 views

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swift - Why does implicitly unwrapped optional not unwrap in dictionary of type [String : Any]

If I have an implicitly unwrapped optional declared in my class which I then reference in a Dictionary of type ... types in my Dictionary. See Question&Answers more detail:os...

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

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628 views

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swift - Querying below AutoID's in Firebase

Results - auto generated ID - auto generated ID value1: abc value2: def I want to be able to query where " ... doesn't work as described above. See Question&Answers more detail:os...

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

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587 views

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swift - How to use generic types to get object with same type

I have extension for NSManagedObject that should help me to transfer objects between contexts: extension NSManagedObject ... type to MyEntity? See Question&Answers more detail:os...

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

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830 views

1 answer

swift - function with dataTask returning a value

I wan't to check if my url statusCode equals to 200, I created a function returning a Boolean if the ... -void return value in void function See Question&Answers more detail:os...

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

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609 views

1 answer

swift - iOS SceneKit Neon Glow

Have been looking at lighting on Scenekit, and while I can now apply a lighting node to light something I'm ... to achieve this? Many 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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806 views

1 answer

swift - Stop a DispatchQueue that is running on the main thread

I have this block of code: DispatchQueue.main.asyncAfter(deadline: .now() + (delay * Double(isDelayAccounted.hashValue)) ... I want to stop 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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813 views

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swift - Ambiguous reference to member 'tableView'

Code and errors Continued on the code and one more errors! Hi, I'm new to Xcode swift. I have been doing good ... can't link more items than 2. 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 - How do you detect a SwiftUI touchDown event with no movement or duration?

I'm trying to detect when a finger first makes contact with a view in SwiftUI. I could do this very ... experiencing a specific contextual bug. See Question&Answers more detail:os...

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

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637 views

1 answer

swift - sectionName in tableView with date

//date func sectionName() -> String{ var shortDate: String let dateFormatter = NSDateFormatter() dateFormatter.dateFormat = ... don't know why. See Question&Answers more detail:os...

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

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792 views

1 answer

swift - Can't programmatically change color set in storyboard as color from xcassets catalog

When I set color of some property in Storyboard (for example textColor of my UILabel) as color created as New ... So, why is this happening? See Question&Answers more detail:os...

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

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623 views

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swift - Get column from 2D array – how to restrict array type in extension?

I'd like to extend Array in Swift to return a single element in each array, or column, for a 2D ... extension documentation Thanks in advance. See Question&Answers more detail:os...

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

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427 views

1 answer

swift - iOS: How to pass a model from view model to view model using MVVM?

Suppose I have a model, Car, that is instantiated in ViewModel1 with the following initial properties: ViewModel1 ... vc2.viewModel.car = car See Question&Answers more detail:os...

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

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851 views

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swift - How set rootViewController in Scene Delegate iOS 13

Before changes in UIKit iOS 13 how I can set rootViewController at SceneDelegate? class SceneDelegate: UIResponder, ... { return } } See Question&Answers more detail:os...

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

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494 views

1 answer

swift - Why does filter(_:)’s predicate get called so many times when evaluating it lazily?

I saw an answer to this question, which, in it's first revision, had code similar to this: let numbers = ... of the same element multiple times? See Question&Answers more detail:os...

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

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814 views

1 answer

swift - Perform assignment only if right side is not nil

Is there a possibility to only perform an assignment (e.g. to a non-optional property) if the ... object.nonOptionalProperty = unwrapped } See Question&Answers more detail:os...

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

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605 views

1 answer

swift - How to get the Iphone type from simulator (IOS)

There are a lot of solutions to find out on which device out app is running. iOS: How to determine the ... device is simulated in code ? See Question&Answers more detail:os...

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

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743 views

1 answer

swift - How to do if pattern matching with multiple cases?

I'm searching for the syntax to do pattern matching with multiple cases in an if case statement. The example would be ... Male, .Female = 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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849 views

1 answer

swift - Shrink large title when scrolling (not UITableViewController) iOS 11

I have got a View Controller embedded in a Navigation Controller with prefers large titles option set to true; inside the ... 9, Swift 4, iOS 11 See Question&Answers more detail:os...

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

0 votes

862 views

1 answer

swift - ARKit: Placing an SCNText at a particular point in front of the camera

I've managed to get a cube (SCNNode) placed on a surface where the camera is pointed, however I am ... ve never worked in SceneKit before. See Question&Answers more detail:os...

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

0 votes

748 views

1 answer

swift - Set rootViewController iOS 13

After upgrading Xcode a critical part of my application has stopped working. When my app launches I run a ... is much appreciated. Thank! See Question&Answers more detail:os...

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

0 votes

643 views

1 answer

swift - Is it possible to create a view-based NSTableView purely in code?

I have successfully created a cell-based NSTableView purely in code. I would like to make the cells a little ... this would be much 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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