Recent questions tagged Swift

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swift - How to detect a tap gesture location in SwiftUI?

(For SwiftUI, not vanilla UIKit) Very simple example code to, say, display red boxes on a gray background: struct ... How would I go about 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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563 views

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swift - Simultaneous accesses to 0x1c0a7f0f8, but modification requires exclusive access error on Xcode 9 beta 4

my project uses both Objective-C and Swift code. When a user logs in, it calls a set of apis for user ... beta 3. Any help is appreciated 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 - Initialize @StateObject with a parameter in SwiftUI

I would like to know if there is currently (at the time of asking, the first Xcode 12.0 Beta) a way to ... , while this view does not. 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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671 views

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swift - Using DateFormatter on a Unix timestamp

I get a crash when running and it points at the dateFormmater.timezone. The error in the console is: Could not ... myTimeStamp! /** 1000*/) See Question&Answers more detail:os...

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

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820 views

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swift - Deleting all documents in Firestore collection

I'm looking for a way to clear an entire collection. I saw that there is a batch update option, but that would ... , batchSize: batchSize) } } } 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 - Swift3 iOS - How to make UITapGestureRecognizer trigger function

I am trying to add a UITapGesture to a UIButton so it will trigger a function when tapped. I am using Swift 3 and ... print("Please Help!") } } 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 - Using a Type Variable in a Generic

I have this question except for Swift. How do I use a Type variable in a generic? I tried this: func intType() -> ... var arr = Array<t>() } } 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 - NSAttributedString, change the font overall BUT keep all other attributes?

Say I have an NSMutableAttributedString . The string has a varied mix of formatting throughout: Here is an example: ... , in fact "additive". 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 do you create a multi-line text inside a ScrollView in SwiftUI?

Since List doesn't look like its configurable to remove the row dividers at the moment, I'm using a ScrollView ... height for the Text frame ? See Question&Answers more detail:os...

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

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605 views

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swift - Transparent background for modally presented viewcontroller

I am using Parse & ParseUI. I want my PFLoginViewController subclass to have a transparent background. In the ... subclass makes no difference See Question&Answers more detail:os...

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

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573 views

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swift - Main Thread Checker: UI API called on a background thread: -[UIApplication applicationState]

I am using google maps in Xcode 9 beta, iOS 11. I am getting an error outputted to the log as follows: ... .camera.target.longitude)") } } See Question&Answers more detail:os...

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

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631 views

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swift - Keep window always on top?

In Objective-C for Cocoa Apps it's possible to use such way to keep window always on top? ... of unresolved identifier 'NSFloatingWindowLevel' See Question&Answers more detail:os...

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

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752 views

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swift - How to add Equal Spacing and equal width for button in iOS Auto layout

Am new to Auto layout constraints in Xcode. I have one Bottom View like UITabBar with 6 UIButtons. Without ... help. 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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550 views

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swift - UIAlertView/UIAlertController iOS 7 and iOS 8 compatibility

I am using Swift to write an app and I need to show an alert. The app must be iOS 7 and iOS 8 ... a presentation or dismiss is in progress! See Question&Answers more detail:os...

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

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641 views

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swift - Difference between computed property and property set with closure

I'm new to Swift. What is the difference between a computed property and a property set to a closure? I ... : 50) return lazilyCreatedPush } } See Question&Answers more detail:os...

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

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441 views

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swift - Calling protocol default implementation from regular method

I'm wondering if it's possible to achieve such a thing. I have a Playground like this: protocol Foo { func ... to achieve the same with structs. See Question&Answers more detail:os...

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

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797 views

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swift - Sharing data between an iOS 8 share extension and main app

Recently, I've been making a simple iOS 8 share extension to understand how the system works. As Apple states ... user credentials for an API. See Question&Answers more detail:os...

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

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600 views

1 answer

swift - iOS 11 customise search bar in navigation bar

I want to change the color of the text and icon in the iOS 11 searchbar when it is embedded in the navigation ... 11. Any help is appreciated. See Question&Answers more detail:os...

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

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660 views

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swift - Changing navigation title programmatically

I have a navigation bar with a title. When I double click the text to rename it, it actually says it's a ... , I want the title to change. See Question&Answers more detail:os...

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

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605 views

1 answer

swift - Swipe-able Table View Cell in iOS 9

I want my table list to have a swipe-able menu like in iOS 8 (first introduced in iOS 7). I've found a ... to me in a neatly wrapped package. See Question&Answers more detail:os...

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

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501 views

1 answer

swift - Downloading JSON with NSURLSession doesn't return any data

I am currently trying to download, parse and print JSON from an URL. So far I got to this point: ... from NSURL Connection to NSURLSession] See Question&Answers more detail:os...

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

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543 views

1 answer

swift - What is the cause of this type error?

Two questions: Why does this code fail to compile? I believe (but am not 100% sure, I may have made a mistake) that ... >(xs: self.xs.map(f)) } 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

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swift - Convert String to URL (Why is resulting variable nil)

I'm trying to create an URL variable from a string value. I don't understand why the resulting URL is nil I ... .de/" but url is nil debugger See Question&Answers more detail:os...

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

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906 views

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swift - binary operator * cannot be applied to operands of type Int and Double

I'm trying to build a simple Swift app to calculate VAT (Value Added taxes = 20%). func taxesFree(number: Int ... var result = textfield * VAT See Question&Answers more detail:os...

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

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500 views

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swift - How do I detect which SKSpriteNode has been touched

I find a similar question, but I am trying to detect and identify which Sprite the user touch, and I don ... step it′s identify the sprite. See Question&Answers more detail:os...

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

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762 views

1 answer

swift - How can I get text to wrap in a UILabel (via UIViewRepresentable) without having a fixed width?

Setting lineBreakMode to byWordWrapping and set numberOfLines to 0 does not seem to be sufficient: struct MyTextView: ... the View is". See Question&Answers more detail:os...

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

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551 views

1 answer

swift - ios 11 custom navbar goes under status bar

just downloaded xcode 9 and i'm having this weird issue, on ios 11 my custom navbar appears to be half in size ... left and ios10 on the right, See Question&Answers more detail:os...

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

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976 views

1 answer

swift - ARKit – What do the different columns in Transform Matrix represent?

An ARAnchor's 4x4 matrix has 4 columns. The fourth column of the matrix contains 3 translate values for x, y ... the other 3 columns represent? See Question&Answers more detail:os...

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

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