Recent questions tagged swift

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swift - How to call the more specific method of overloading

Here is an example playground: protocol P { associatedtype T func getValue() -> T } class Foo: P { func ... way to call the generic one? 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 - How to speed up updating relationship among tables, after one or both tables are already saved?

Question: Update and save fast, relationship between tables with lots of data after both or one of the table is ... advance for anyknid of 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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975 views

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swift - How are hash collisions handled?

I've recently learned a little bit about hash values, and therefore also heard of about the problem of hash ... to have the same hash? 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 - Xcode 11 Beta 3, build error "Unknown attribute 'State'", "Use of undeclared type 'View'" etc

I build an app with the 2nd beta of Xcode 11, using SwiftUI, and everything worked completely fine, but now, ... Use of undeclared type '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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swift - Protocol for class method

I want to declare in a protocol a class func, I intend to conform to this protocol from a class A, B and ... sure how to abstract 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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993 views

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swift - Compare three values for equality

Does anybody know of a shortcut to test whether three numbers are the same? I know this works: if number1 = ... a lot of different values. See Question&Answers more detail:os...

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

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998 views

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swift - Adding Local dependencies in XCode11 using SPM

Is it posible to integrate local dependencies with SPM in xcode 11, File > Swift Packages > Add Package dependency. ... Im using xcode11 beta 5) 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 - 'Method' is ambiguous for type lookup in this context, Error in Alamofire

I am using Alamofire for network handling in swift and run into one weird error. It seems like we can't pass ... false, response:nil) } } } 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 - unable to save on/off state of a UITableViewCell?

there are two attributes 'time' and 'isOn' (string, bool) in the entity named 'Item' in viewcontroller class I ... switchBtn.isOn = false } } } See Question&Answers more detail:os...

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

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983 views

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swift - Executing text-to-speech in order

I want to synthesize text. I have an array of sentences and array of pauses, that I wish between these sentences. ... ) semaphoreIndex += 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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976 views

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swift - MPMoviePlayer in iOS 9

i have made a function in iOS 8 to play a movie in the background and now when i want to use it ... viewcontroller return true } return false } See Question&Answers more detail:os...

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

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894 views

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swift - How to clustered markers from Firebase in GoogleMaps for iOS

I'm developing an app on which I want to show a lot of events on the map. The user can click on an event ... show when user open the map 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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1.0k views

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swift - didReceiveRemoteNotification is not running when app is running (FOREGROUND)

I have a strange case. My swift ios app is connected to Cloudkit. If the app is NOT running (background ... in the foreground or background. See Question&Answers more detail:os...

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

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1.1k views

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swift - Change the color of UIButton in IBOutletCollection

I have an IBOutletCollection of UIButton: @IBOutlet var buttons: [UIButton]! and a function for a tap: @IBAction ... the problem in this part? See Question&Answers more detail:os...

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

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800 views

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swift - How to know when multiple web calls have ended, to call completion

I'm fairly new to Swift and this question is probably really stupid. So bear with me please. I have a ... calls have ended. 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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896 views

1 answer

swift - How can i access firebase variable outside firebase function

Im trying to update a variable inside a class "var CurrentStatus:status! " status is an enum. I have a ... }) } } return CurrentStatus } See Question&Answers more detail:os...

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

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918 views

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swift - CollectionView not display data after parsing JSON

After parsing JSON I got my data in arraOfData of ViewController, but collectionView not display this. If I use static ... )" return cell! } } See Question&Answers more detail:os...

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

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822 views

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swift - My UIViewcontroller is not filling the entire screen?

I have a very simple app with two UIviewcontrollers. I want to dismiss one and present another one. However, when I ... : true) {} } Result: See Question&Answers more detail:os...

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

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1.0k views

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swift - UIAlertView is crashing app on iOS 7

I have just released my app on the App Store however I have just been emailed and told that there is issues with ... version of iOS 7 or 8? See Question&Answers more detail:os...

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

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2.2k views

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swift - How do I delete an item in a collection view with a button in the cell?

It seems like it should be easy to do, but how do I delete the item at the indexPath when the "X" ... realm.delete(category) code. Thank you. See Question&Answers more detail:os...

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

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934 views

1 answer

swift - Handling asynchronous Firestore data reading in tableView - iOS

I would like to retrieve data from my simple Firestore database I have this database: then I have a model class ... . Thank you 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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1.1k views

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swift - SwiftUI: How to make entire shape recognize gestures when stroked?

I'm creating a custom button in SwiftUI using some shapes. As a minimal example, I have a filled rectangle, enclosed ... self.action() } ) } } See Question&Answers more detail:os...

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

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961 views

1 answer

swift - Why is Calendar.date(from: DateComponents) adding time?

I create an instance of DateComponents using the following code: let dateComponents = DateComponents( calendar: .current ... help in advance. See Question&Answers more detail:os...

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

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1.1k views

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swift - Spacer not working with Form inside a VStack

I'm trying to get a circle on top with the form content down below, right above my TabBar. I can somewhat force this ... test2", text: $b) } } } See Question&Answers more detail:os...

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

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933 views

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swift - Extension for Generic Type `UnsafeMutablePointer<UInt8>`

I'd like to create an extension for UnsafeMutablePointer that only affects UnsafeMutablePointer<UInt8>... I understand ... . is this possible? See Question&Answers more detail:os...

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

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833 views

1 answer

swift - Are there any concrete examples when using the Any type is a good solution?

We all know that swift has a strong type system, and as such I lean towards using this system to my advantage :) Here ... in "Hello, (name)" }) See Question&Answers more detail:os...

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

0 votes

933 views

1 answer

swift - Flip ARFaceAnchor from left-handed to right-handed coordinate system

After some testings by printing faceAnchor.transform.columns.3, digging in SO: ARFaceAnchor have negative Z position? ... Thank you in advance See Question&Answers more detail:os...

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

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1.0k views

1 answer

swift - Getting a let value outside a function

Hello I'm new at swift programming and i want to get label value from loadData() to use use for my path ( ... a follow up from this one.) See Question&Answers more detail:os...

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

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