Recent questions tagged Swift

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swift - Are there any possible explicit uses of instances (values) of empty tuples (), i.e., of instances of typealias 'Void'?

Question: Are there any possible explicit uses for the empty tuple (), as a value (and not as a type) in ... beings (as instances, not types)? 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 - Find nearest smaller number in array

I would like to be able to find the nearest smaller value in an array of numbers. For instance, if I have ... be a cleaner, functional way. 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 - UIStoryBoard - Prevent View from overlapping status bar (iOS 11 App)

I want to stop overlapping of my View with statusbar See Question&Answers more detail:os...

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

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946 views

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swift - Convert an String to an array of int8

I have an C struct (old library, blah blah blah) which contains an C string, now I need to convert CFString and Swift ... int8....) to [CChar]. 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 - Highlight a specific part of the text in SwiftUI

Hello I'm new to Swift and am using SwiftUI for my project where I download some weather data and I display it ... index]) } return 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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822 views

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swift - Why am I allowed method access less restrictive than class access?

Why does this compile? internal class A { public func f() { } } I expected f's "public" modifier ... because its enclosing class is internal. See Question&Answers more detail:os...

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

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890 views

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swift - Is it possible to cast Any to an Optional?

Let's say I have a piece of code like this: let x: Int? = 10 let y: Any = x Now I want to cast ... just not possible or is there another way? See Question&Answers more detail:os...

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

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888 views

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swift - NSURL found nil while unwraping an Optional value

Anyone knows why am I getting fatal error: unexpectedly found nil while unwrapping an Optional value When i use let ... -35.28032,149.12907")! 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 - Firestore order by time but sort by ID

I have been trying to figure out a way to query a list of documents where I have a range filter on one ... by created at in the collection? 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 - Firebase crashlytics is not initialized in iOS

In our project we were used the fabric for reporting crash, after that we have migrated the fabric with ... }/Fabric/run API_KEY BUILD_SECRET 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 - "Generic parameter could not be inferred" in SwiftUI UIViewRepresentable

I've got the following code, which makes it possible to use the UIKit's UIScrollView in my SwiftUI code. It ... can I solve the error message? See Question&Answers more detail:os...

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

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922 views

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swift - How to programmatically open Apple Watch companion app from iOS app

I would like to give a hint to the user, that my iOS app supports the Apple Watch. So I would like to link/ ... any URL schema, but it does 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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865 views

1 answer

swift - Creating a CountableClosedRange<Character>

I am trying to extend Character to conform to Strideable in order to create a CountableClosedRange of Character types. ... } What am I missing? See Question&Answers more detail:os...

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

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811 views

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swift - Unexpectedly large Realm file size

This question is about using two different ways to insert objects into a Realm. I noticed that the first method ... file sizes in these cases? See Question&Answers more detail:os...

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

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876 views

1 answer

swift - Sprite Kit physicsBody.resting behavior

I am using Swift and Sprite Kit to develop a game on XCode Beta 6. In order to detect if all nodes are ... i miss something? Thanks 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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708 views

1 answer

swift - Implementing a function with a default parameter defined in a protocol

Swift protocols can provide default implementations for functions and computed properties by adding extensions to them. I've ... , 0.0) Why? 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 - Cannot assign to property: function call returns immutable value

Consider the following example. struct AStruct{ var i = 0 } class AClass{ var i = 0 var a: A = A ... immutable value. Can someone explain 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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877 views

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swift - Is there a difference between "is" and isKindOfClass()?

Swift provides the is keyword (and as?) to check whether an object can be downcast successfully: if foo is ... is this really much different? See Question&Answers more detail:os...

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

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831 views

1 answer

swift - Path to bundle of iOS framework

I am working on a framework for iOS, which comes with some datafiles. To load them into a Dictionary I do ... part of a struct or class. See Question&Answers more detail:os...

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

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867 views

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swift - SwiftUI how to prevent view to reload whole body

Basically I try to figure out when my viewModel get updated, it will notify view and it will refresh whole body ... store(in: &cancellables) } } 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

1 answer

swift - How to set unsafe area background color for ios 11

Creating some new view controllers with xcode 9 so now I have a few safe areas to deal with. I am ... unsafe area though. Any thoughts? 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

1 answer

swift - How to replace nth character of a string with another

How could I replace nth character of a String with another one? func replace(myString:String, index:Int, newCharac: ... be equal to "Horse". See Question&Answers more detail:os...

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

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903 views

1 answer

swift - Showing cells in demands in UICollectionView with vertical infinite scroll

I would like to know how to achieve using a UICollectionView the desired effect of loading in demand like in ... something? Thanks 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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961 views

1 answer

swift - How to display Realm Results in SwiftUI List?

I have been able to save data in a Realm database, but have been unable to show the results in a SwiftUI ... I have time. That looks promising. 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

1 answer

swift - Apply vertical alpha gradient to UITableView

I'm new to iOS development and am trying to learn Swift. I'd like to apply a vertical alpha gradient to ... . Can any lend some assistance? See Question&Answers more detail:os...

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

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915 views

1 answer

swift - How to completely remove Realm database from iOS?

Now I get error Property types for 'value' property do not match. Old type 'float', new type 'double' ... database or migrate is successfully? 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 - Objective-C Bridging Header for frameworks

I've made a framework that requires the sqlite3 framework. How do I add a Objective-C Bridging Header for my ... , but not for my framework. 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

1 answer

swift - Get width of a view using in SwiftUI

I need to get width of a rendered view in SwiftUI, which is apparently not that easy. The way I see it is that I ... (.heavy) .opacity(0.5) } } See Question&Answers more detail:os...

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

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