Recent questions tagged Swift

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swift - How to pass one SwiftUI View as a variable to another View struct

I'm implementing a very custom NavigationLink called MenuItem and would like to reuse it across the project. It's ... as an argument. Thanks ;D See Question&Answers more detail:os...

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

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799 views

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swift protocol 'weak' cannot be applied to non-class type

I'm a bit confused. What's the difference between protocol A : class { ... } and protocol A{ ... }, ... ' cannot be applied to non-class type See Question&Answers more detail:os...

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

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576 views

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swift - Using as a concrete type conforming to protocol AnyObject is not supported

I'm using Swift 2 and using WeakContainer as a way to store a set of weak objects, much like NSHashTable. ... . How to get around 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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swift - How to add Alamofire URL parameters

I have a working scenario using Postman passing in URL parameters. Now when I try to do it via ... URLEncoding.default, headers: headers See Question&Answers more detail:os...

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

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682 views

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swift - UIApplication.shared.delegate equivalent for SceneDelegate xcode11?

I have defined a let property within my SceneDelegate. I would like some of the ViewControllers to be able ... the UIViewController's instance? See Question&Answers more detail:os...

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

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812 views

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swift - iOS 9.3 : An SSL error has occurred and a secure connection to the server cannot be made

I am getting following error with self signed certificate Error Domain=NSURLErrorDomain Code=-1200 "An SSL error ... working after huge efforts? 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

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swift - iOS 11 UISearchBar in UINavigationBar

I want to place a search bar in the new navigation bar with the new iOS 11 large titles. However, the ... from StackOverflow - doesn't 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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695 views

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swift - Access input from UIAlertController

I've got a UIAlertController which is prompted to the user when they choose "Enter Password" on the TouchID screen. ... and some new API stuff. See Question&Answers more detail:os...

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

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667 views

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swift - Go to a new view using SwiftUI

I've got a basic view with a button using SwiftUI and I'm trying to present a new screen/view when the ... fontWeight(.ultraLight) } } } } 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 get heart rate from Apple Watch in near real time

I need to make an app that records heart rate data in near real time and send this data to a server as ... iPhone. That seems to be impossible See Question&Answers more detail:os...

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

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687 views

1 answer

swift - sendAsynchronousRequest was deprecated in iOS 9, How to alter code to fix

Below is my code I am getting the issue with: func parseFeedForRequest(request: NSURLRequest, callback: (feed: RSSFeed?, ... don't know how to. See Question&Answers more detail:os...

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

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679 views

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swift - SwiftUI: Send email

In a normal UIViewController in Swift, I use this code to send a mail. let mailComposeViewController ... to use UIViewControllerRepresentable? See Question&Answers more detail:os...

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

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630 views

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swift - How can I disambiguate a type and a module with the same name?

I'm trying to use Károly L?rentey's B-tree based OrderedSet in a project. However, I'm running into an ... BTree type and the BTree module? See Question&Answers more detail:os...

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

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900 views

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swift - How to solve "String interpolation produces a debug description for an optional value; did you mean to make this explicit?" in Xcode 8.3 beta?

Since beta 8.3, zillions warnings "String interpolation produces a debug description for an optional value; did you ... wait for the next beta? See Question&Answers more detail:os...

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

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616 views

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swift - What's the difference between Struct based and Class based singletons?

Are the two approaches the same or are there major differences/pitfalls to be aware of: class MyClassSingleton { ... struct Singleton") } } See Question&Answers more detail:os...

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

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891 views

1 answer

swift - How to set the BlurRadius of UIBlurEffectStyle.Light

I was wondering how to set the radius/blur factor of iOS new UIBlurEffectStyle.Light? I could not find ... = frame addSubview(effectView) } See Question&Answers more detail:os...

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

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1.4k views

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swift - Cannot explicitly specialize a generic function

I have issue with following code: func generic1<T>(name : String){ } func generic2<T>(name : String){ generic1< ... should be (String) -> Void 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 - dismiss keyboard with a uiTextView

I am sure this is not that difficult, but I am having trouble finding info on how to dismiss a keyboard with the ... (true); return true; } } See Question&Answers more detail:os...

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

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2.0k views

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swift - High-Quality Rendering – RealityKit vs SceneKit vs Metal

I'm creating an iOS app that I intend to display realistic/high-quality renders within AR. Whilst ... High-Quality Model Rendering? 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

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swift - Add subtitle under the title in navigation bar controller in Xcode

So I'm wanting to add a "subtitle" under the title in the navigation bar in navigation controller. Mostly ... , swift is preferred. Thanks! See Question&Answers more detail:os...

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

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910 views

1 answer

swift - How to create a fixed-size array of objects

In Swift, I am trying to create an array of 64 SKSpriteNode. I want first to initialize it empty, then ... the element directly by their index. See Question&Answers more detail:os...

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

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651 views

1 answer

swift - how to use Alamofire with custom headers

I am just starting to take a look at Mattt's wonderful new Alamofire swift networking library and am ... , forHTTPHeaderField:"Authorization") See Question&Answers more detail:os...

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

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515 views

1 answer

swift - How to display data from Firebase faster?

I have label and data from Firebase. I need to get the data, count it and update Label. But I have problem. ... slow. I do it all in viewDidLoad See Question&Answers more detail:os...

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

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469 views

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swift - UIScrollView with Embedded UIImageView; how to get the image to fill the screen

UIKit/Programmatic UI I have an UIScrollView with an UIImageView inside. The image is set by user selection and can ... set this up correctly ? See Question&Answers more detail:os...

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

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647 views

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swift - How to iOS item and font sizes scaling as screen size

I want to make item and font sizes looking same as screen sizes. I used to use item ratio for scaling to ... and font for different iOS devices? See Question&Answers more detail:os...

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

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610 views

1 answer

swift - Why can we not cast to protocol types with associated types but achieve the same effect using generics?

Consider this code: extension Collection { func foo() -> Int { if self.first is Collection { return (self.first ... it does not in line ERROR? See Question&Answers more detail:os...

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

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698 views

1 answer

swift - Formatting decimal places with unknown number

I'm printing out a number whose value I don't know. In most cases the number is whole or has a ... ", number) } return formattedNumber } See Question&Answers more detail:os...

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

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947 views

1 answer

swift - unowned vs. weak. Why we should prefer unowned?

As Apple said in "The Swift Programming Language", it seems we should prefer unowned than weak whenever possible: ... of unowned all the time? See Question&Answers more detail:os...

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

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