Recent questions tagged Swift

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swift - Firebase Observe called after following command

I am trying to load a username form a Firebase which is than supposed to be set in an Object. But ... : nameModel, decorationAttributes: 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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837 views

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swift - Images in iOS push notification

I am trying to send images in push notifications I have made the notifications registrations in app delegate ... image in push notifications See Question&Answers more detail:os...

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

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666 views

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swift - Why can't I check to see if my array of arrays contains a specific array?

I'm trying to check to see if an array of arrays contains an array of Strings. My error message says: "Cannot find ... exp1) } What's going on!? See Question&Answers more detail:os...

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

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939 views

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swift - Create codable struct with generic type

First of all, Sorry for unclear title of question I'm making a codable struct which will be used as json ... smart way to deal with this. See Question&Answers more detail:os...

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

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750 views

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swift - Could not find an overload for '^' that accepts the supplied arguments

func squareArea(side:Double) -> Double { return side ^ 2 } I get the error: could not find an overload for ... fine. What is the correct syntax? 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 - Distinction between private and fileprivate top-level classes

In Swift 3, what exactly is the difference in access control between private class Foo { } and fileprivate ... nested in some other construct? 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 - Ordered Dictionary in JSON

There are 3 string variables public var userLoginId : String? public var searchString : String? public var ... assigned value to dictionary? See Question&Answers more detail:os...

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

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813 views

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swift - Do Optionals default to nil?

What is the initial value of the delegate variable if no constructor is provided? class Example { weak var delegate: Bool? } See Question&Answers more detail:os...

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

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1.8k views

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swift - Get an Array of Dates of the current week starting on Monday

I have this code currently: public var daysOfWeek: [Date]? { let calendar = Calendar.current let today = self ... with Monday and not Sunday. See Question&Answers more detail:os...

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

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900 views

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swift - Call completion block when two other completion blocks have been called

I have a function doEverything that takes a completion block. It calls two other functions, doAlpha and doBeta ... implement that. Many 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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654 views

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swift - Global function sequence(state:next:) and type inference

Background & details Swift evolution proposal SE-0094 was implemented in Swift 3.0, introducing the global sequence ... am I missing something? 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 - Make Int round off to nearest value

I've got two Int values (they have to be Ints) and I want them to round off to the nearest value when ... number without changing it to a Double 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 - Is there any way access manufacturer data from iOS device

Maybe this question duplicate but my situation is different from others. I have a own bluetooth kit. It puts ... We can customize ble firmware. See Question&Answers more detail:os...

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

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937 views

1 answer

swift - error processing json data: The data couldn’t be read because it isn’t in the correct format

This error has been annoying all morning, I'm trying to retrieve JSON in the format: song = { 'artist':'Tom Waits', ... )") } } return 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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697 views

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swift - Single-element parethesized expressions/tuples vs common use of parentheses

Sorry if this is trivial - I am so new to swift, actually I have only looked at the language guide+reference ... (Int) multiplied by an 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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699 views

1 answer

swift - How can I create an array of functions?

I'm trying to build out a basic implementation of Promises in Swift, and I need to be able to add ... functions being first-class citizens. See Question&Answers more detail:os...

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

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805 views

1 answer

swift - How to create several cached UIColor

I have custom colors within my code. I use them several times and I would like to have them allocated only ... them cached like Apple does ? See Question&Answers more detail:os...

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

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753 views

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swift - Function throws AND returns optional.. possible to conditionally unwrap in one line?

I am using an SQLite library in which queries return optional values as well as can throw errors. I would like to ... } else { return 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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1.1k views

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swift - SwiftUI list empty state view/modifier

I was wondering how to provide an empty state view in a list when the data source of the list is empty. ... EmptyListExample(objects: []) } } See Question&Answers more detail:os...

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

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926 views

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swift - iOS Timer in the background

I want in my iOS application to start a timer when the app is running in the background and when the app ... not running/run in the 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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623 views

1 answer

swift - Why I can change/reassigned a constant value that Instantiated from a class

I've created the following class class Person { var firstName: String var lastName: String init(firstName: String, ... firstName) // -> John 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

1 answer

swift - Protocol extending Encodable (or Codable) does not conform to it

I have 2 protocols, Filters and Parameters, both of which extend Encodable protocol Filters: Encodable { var page: ... there a way around this? See Question&Answers more detail:os...

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

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681 views

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swift - Difference between [String] and Array<String>

Which is better way to declare Array and Dictionary, I have used both: Array<String> [String] For me [String ... and which one we should follow? See Question&Answers more detail:os...

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

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778 views

1 answer

swift - Initialize lazy instance variable with value that depends on other instance variables

The following initialization currently produces this error in the line that calls getEventCalendar: Cannot use instance member ' ... ... } } See Question&Answers more detail:os...

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

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715 views

1 answer

swift - Remove matched item from array of objects?

I have an array of objects like this: var myArr = [ MyObject(name: "Abc", description: "Lorem ipsum 1."), ... "Def" } // Pseudo Any ideas? 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

1 answer

swift - 'substring(to:)' is deprecated: Please use String slicing subscript with a 'partial range upto' operator

How can I update the following code to the new version of swift: self.areaCodeLael.text! = localNumber. ... index of type 'PartialRangeUpTo' See Question&Answers more detail:os...

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

0 votes

814 views

1 answer

swift - swiftyjson - Call can throw, but it is marked with 'try' and the error is not handled

I am trying to use swiftyjson and I am getting an Error: Call can throw, but it is marked with 'try' and the ... } Thank you for all the 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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1.2k views

1 answer

swift - Default argument not permitted in a tuple type when defining function type

I've got a function like this: func next(step: Int = 1){ //.... } And now I would like to define a ... define a type for this kind of function? See Question&Answers more detail:os...

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

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