Recent questions tagged swift

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swift - Programmatically creating constraints bound to view controller margins

I'm trying to make a view that will act as a sort of "panel", attached to the right ... ([topConstraint, bottomConstraint, widthConstraint]) 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 case works in if-case

An old C programmer could use some help with Swift. I don't understanding something about the if-case ... insight would be greatly appreciated. See Question&Answers more detail:os...

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

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652 views

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swift - SwiftUI: Forcing an Update

Normally, we're restricted from discussing Apple prerelease stuff, but I've already seen plenty of SwiftUI discussions, ... the VStack or body. See Question&Answers more detail:os...

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

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721 views

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swift - When to use forEach(_:) instead of for in?

As documented in both Array and Dictionary forEach(_:) Instance methods: Calls the given closure on ... working with functional programming. 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 - Scanning Real-World Object and generating 3D Mesh from it

ARKit app allows us to create an ARReferenceObject, and using it, we can reliably recognize the position ... Reconstruction or Photogrammetry? See Question&Answers more detail:os...

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

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562 views

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swift - If arrays are value types and therefore get copied, then how are they not thread safe?

Reading this I learn that: Instances of value types are not shared: every thread gets its own copy.* That means ... back to Swift 101 again :D See Question&Answers more detail:os...

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

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633 views

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swift - Add a method to Card that creates a full deck of cards, with one card of each combination of rank and suit

So I have been doing the experiments that are in the Apple Swift Book. I have been able to ... threeOfSpades.createFullDeck() seems incorrect. See Question&Answers more detail:os...

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

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718 views

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swift - Linker command failed with exit code 1 after installing CocoaPods and firebase pod

I'm trying to use the firebase pod, however getting this (see image) error message when a run is attempted. I ... clean it a bunch of times. 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 - Convert UIImage to grayscale keeping image quality

I have this extension (found in obj-c and I converted it to Swift3) to get the same UIImage but grayscaled: ... can't I improve the quality ? See Question&Answers more detail:os...

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

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487 views

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swift - replacing CALayer and CABasicAnimation with SKScene and SKActions

I am trying to restructure this Github Swift project on Metaballs so that the circles are represented by SKShapeNodes ... = center1.angleBetween(center2) let angle2 = acos((rad...

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

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691 views

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swift 3 method in objective-c fails with no visible @interface for 'MySwiftClass' declares the selector 'addX:andY'

we are trying to reference swift methods inside an objective-c implementation. Swift 3 Class: import Foundation @objc ... selector 'addX:addY' See Question&Answers more detail:os...

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

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716 views

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swift - 'UIFont' is not convertible to 'UIFont?'

So I had updated my XCode to 7.3 today evening. In one of my projects, I get the following error for few ... idea why this is happening? TIA! See Question&Answers more detail:os...

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

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713 views

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swift - What does the SwiftUI `@State` keyword do?

The SwiftUI tutorial uses the @State keyword to indicate mutable UI state: @State var showFavoritesOnly = false It ... within the body getter? See Question&Answers more detail:os...

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

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803 views

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swift - Embedding videos in a tableview cell

What's the best way for embedding a video into a UITableViewCell? I'm trying to build something sorta like Vine/ ... .view) } 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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780 views

1 answer

swift - Alamofire - NSURLCache is not working?

I set my cache as below var cacheSizeMemory = 20 * 1024 * 1024 var cacheSizeDisk = 100 * 1024 * 1024 var ... ) value is nil 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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861 views

1 answer

swift - Is there a way to call a function when a SwiftUI Picker selection changes?

I would like to call a function when selectedOption's value changes. Is there a way to do this in SwiftUI ... would love some help. 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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1.5k views

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swift - Hide navigation bar without losing swipe back gesture in SwiftUI

In SwiftUI, whenever the navigation bar is hidden, the swipe to go back gesture is disabled as well. ... or solutions are greatly appreciated 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 - How to connect to self signed servers using Alamofire 1.3

I get the below error while connecting to self signed server. Error Domain=NSURLErrorDomain Code=-1202 "The ... be implemented. Please advice. See Question&Answers more detail:os...

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

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739 views

1 answer

swift - iOS 11 large navigation bar title unexpected velocity

I am trying to implement the iOS 11 native large navigation bar title on my new application. By calling ... and flag for prefersLargeTitles. 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 - Load image from iOS 8 framework

I'm trying to load an image from an iOS 8 framework that I'm writing (in Swift). I'm using Xcode 6 ... , but this doesn't work either. See Question&Answers more detail:os...

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

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695 views

1 answer

swift - How to check is a string or number

I have an array ["abc", "94761178","790"] I want to iterate each and check is a String or an Integer? ... How to convert "123" to integer 123 See Question&Answers more detail:os...

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

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588 views

1 answer

swift - SafariViewController: How to grab OAuth token from URL?

Trying to use Facebook OAuth with the SafariViewController. First I open the authURL with SafariViewController, which if ... ! Thanks so much! See Question&Answers more detail:os...

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

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977 views

1 answer

swift - Set Toggle color in SwiftUI

I've implemented a toggle after following Apple's tutorial on user input. Currently, it looks like this: This is ... the color of a Toggle? See Question&Answers more detail:os...

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

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812 views

1 answer

swift - "${PODS_ROOT}/SwiftLint/swiftlint" causes "Command PhaseScriptExecution failed with a nonzero exit code" with Xcode 10

Updating from Xcode 10.0 beta 2 to Xcode 10.0 beta 3 I now get this error at build time for an iOS project: ... CocoaPods 1.5.3 SwiftLint 0.26.0 See Question&Answers more detail:os...

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

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907 views

1 answer

swift - Uploading Image to Firebase Storage and Database

I want to put the download URL of images into my Firebase Database. I can upload the Image into storage but I can' ... , completion: 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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2.0k views

1 answer

swift - How to set multi line Large title in navigation bar? ( New feature of iOS 11)

I am in process of adding large title in navigation bar in one of the application. The issue is title is ... by considering large title. 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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1.3k views

1 answer

swift - SwiftUI - Navigation bar button not clickable after sheet has been presented

I have just started using SwiftUI a couple of weeks ago and i'm learning. Today I ran into a into an issue. When I ... { Text("Dismiss") } } } } See Question&Answers more detail:os...

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

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965 views

1 answer

swift - GoogleDataTransport is throwing Double-quoted include in framework header expected angle-bracketed error on iOS14

I've just update XCode to Version 12 and I'm using Firebase. I've updated pods as well but when I build the ... <> it still doesn't go away. See Question&Answers more detail:os...

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

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