Recent questions tagged Swift

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swift - Should conditional compilation be used to cope with difference in CGFloat on different architectures?

In answering this earlier question about getting a use of ceil() on a CGFloat to compile for all architectures, I ... not as "icky") solution? See Question&Answers more detail:os...

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

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697 views

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swift - How do you use the appropriate color class for the current platform?

I'm trying to share my Scene Kit code across iOS and OS X, but the API calls that accept colors (and ... in Swift without duplicating the 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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986 views

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swift - PNG/JPEG representation from CIImage always returns nil

I'm currently making a photo editing app. When a photo is selected by the user, it is automatically converted ... what code should be used. 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 - Projecting the ARKit face tracking 3D mesh to 2D image coordinates

I am collecting face mesh 3D vertices using ARKit. I have read: Mapping image onto 3D face mesh and ... suggestions? 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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swift - iOS 11 Floating TableView Header

Have an app going with multiple sections, a few rows per section when "expanded", none when "collapsed". Each ... there's that. Any ideas? See Question&Answers more detail:os...

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

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775 views

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swift - Firebase snapshot.key not returning actual key?

I have a query that searches for a user based on user ID. usersRef.queryOrderedByChild("email").queryEqualToValue(email ... { print(child.key) See Question&Answers more detail:os...

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

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816 views

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swift - Swift3 optionals chaining in IF conditions bug?

This code worked just fine in Swift 2.3 and I don't understand why I have to unwrap TestClass to check if number ... test?.optionalInt > 4 { } 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 - How to access NSWindow from @main App using only SwiftUI?

At this answer the solution work for Scene plus swiftUI. However using @main like: @main struct MyApp: App ... to perform an authentication. See Question&Answers more detail:os...

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

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738 views

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swift - Why is the shorthand argument name $0 returning a tuple of all parameters?

I was trying to define a variable that can hold a closure and ran into some difficulties using Swift's ... why this would be 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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656 views

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swift - Why are doubles printed differently in dictionaries?

let dic : [Double : Double] = [1.1 : 2.3, 2.3 : 1.1, 1.2 : 2.3] print(dic)// [2. ... more than 2.2999999999999998, 1.2 is just 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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801 views

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swift - Get Description of Emoji Character

Each Emoji has a description that you can see in Mac OS's ??Space special character picker. There's a list ... OPEN MOUTH AND SMILING EYES". See Question&Answers more detail:os...

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

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745 views

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swift - Use reserved keyword a enum case

Is it possible to use a reserved keyword as enum case? For example: enum MyEnum { case Self // compiler ... Is there anything similar in swift? See Question&Answers more detail:os...

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

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1.1k views

1 answer

swift - Saving WebView to PDF returns blank image?

I'm trying to figure out how to save a WebView to a PDF and totally stuck, would really appreciate some ... capture the SubView? Any ideas? See Question&Answers more detail:os...

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

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747 views

1 answer

swift - Generic NSOperation subclass loses NSOperation functionality

Today I've met one weird issue when I was trying to 'generalize' my 'CoreData importing operations'. It ... Am I missing something here? See Question&Answers more detail:os...

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

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1.0k views

1 answer

swift - How can I convert an array to a tuple?

I just want to convert an array into a tuple in Swift; something like the following: >>> myArray = [1,2,3,4,5] ... , so I am very, very new). See Question&Answers more detail:os...

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

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695 views

1 answer

swift - Array element cannot be bridged to Objective-C

I have this code that creates a view and applies a gradient to it. import UIKit import QuartzCore let rect : CGRect ... and how do I solve this? See Question&Answers more detail:os...

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

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649 views

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swift - The "prefs" URL Scheme is not working in iOS 10 (Beta 1 & 2)

I can't get the "prefs" URL Scheme to work in iOS 10 (Beta 1). It's set up correctly since ... the "Settings" button does absolutely nothing. See Question&Answers more detail:os...

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

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502 views

1 answer

swift - Why do Self and self sometimes refer to different types in static functions?

Recently I have been developing multiple heavily protocol-oriented application frameworks with Swift and noticed a few ... be of SomeChildClass? See Question&Answers more detail:os...

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

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1.0k views

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swift - google maps iOS SDK: custom icons to be used as markers

The Android API has a very convenient class for this, IconGenerator. Using the IconGenerator in my Android app, I ... // map is a GMSMapView See Question&Answers more detail:os...

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

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1.2k views

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swift - UIBezierPath: How to add a border around a view with rounded corners?

I am using UIBezierPath to have my imageview have round corners but I also want to add a border to the ... along with my current 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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967 views

1 answer

swift - How do you use .enumerated() with ForEach in SwiftUI?

Here's a simple SwiftUI List that works as expected: struct App: View { let items = Array(100...200) var body: ... ' How do I make this 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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603 views

1 answer

swift - UIWebView dynamic content size

I've been looking around and wasnt able to see any swift related ways to do this. I'm trying to get ... = jobSkillView.frame.size.height } See Question&Answers more detail:os...

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

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825 views

1 answer

swift - iOS13 Navigation bar large titles not covering status bar

On ios13, with iphone x, the large title navigation does not cover the status bar however when scrolling and ... why this is happening. Cheers See Question&Answers more detail:os...

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

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1.1k views

1 answer

swift - why do i get "Must translate autoresizing mask into constraints to have _setHostsLayoutEngine:YES" in xcode 6 beta

I have the following code in a swift UITableViewController, but i get a "Must translate autoresizing mask into ... am i doing wrong? See Question&Answers more detail:os...

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

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649 views

1 answer

swift - How to initialize a struct from a json object

HI i am new to swift any idea . How to initialize a struct from a json object . i could not figure out how can i do ... "] as? String ?? "" } } See Question&Answers more detail:os...

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

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904 views

1 answer

swift - Extension may not contain stored property but why is static allowed

Extension cannot contain stored property, but why then can static stored property be defined within extension? I also didn ... test2 = "Test2" } See Question&Answers more detail:os...

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

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620 views

1 answer

swift - Is SwiftUI backwards-compatible with iOS 12.x and older?

If I have an app made with SwiftUI, will it work for iOS below iOS 13? See Question&Answers more detail:os...

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

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710 views

1 answer

swift - How to access files in iCloud Drive from within my iOS app?

Is there a way to choose file from iCloud Drive similar way to UIImagePickerController()? See Question&Answers more detail:os...

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

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