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Recent questions tagged swift

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swift - Launch a local notification at a specific time in iOS

I am trying to create a timer which triggers a local notification to go off at a time that the user has ... add(request) center.delegate = self See Question&Answers more detail:os...

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

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732 views

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swift - Check string for nil & empty

Is there a way to check strings for nil and "" in Swift? In Rails, I can use blank() to check. I currently have ... !.isEmpty { ...blah blah } } See Question&Answers more detail:os...

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

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582 views

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swift - How to pass a class type as a function parameter

I have a generic function that calls a web service and serialize the JSON response back to an object. class func ... ? var regionName: 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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630 views

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swift - how to init a UIButton subclass?

I am trying to add a double value to a subclass of UIButton in Swift Tried all kind of inits and get and set ... wrong here.... 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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622 views

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swift - Conditionally use view in SwiftUI

I'm trying to figure out the correct way to conditionally include a view with swiftui. I wasn't able to use the if ... else { LoginView() } } } See Question&Answers more detail:os...

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

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516 views

1 answer

swift - Can I install Xcode on an external hard drive along with the iPhone Simulator.app?

I want to install xcode to deploy a cross platform flutter application but I cant find enough space for Xcode is ... it on the internal storage See Question&Answers more detail:os...

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

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1.3k views

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swift - How to Make the scroll of a TableView inside ScrollView behave naturally

I need to do this app that has a weird configuration. As shown in the next image, the main view is a ... be greatly appreciate it :( 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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548 views

1 answer

swift - json file is missing/ struct is wrong

I have been trying to get this code to work for like 6 hours. I get the error: "failed to convert The data ... : String let desc : 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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570 views

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swift - Why are my variables empty when I cast them in my iOS application?

Hi, I am coding an application on Xcode for IOS and I would like to send a variable to another ViewController ... problem? Thank you 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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635 views

1 answer

swift - Push notification not receiving in background iOS

I am doing push notification in my project through GCM. My Application is able to receive notification in ... correct format of payload? See Question&Answers more detail:os...

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

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657 views

1 answer

swift - Firebase query ordering not working properly

Basically I have played with Firebase for the past week, and I recently stumbled upon the 'queryOrderedByChild ... ascending or descending? See Question&Answers more detail:os...

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

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772 views

1 answer

swift - iOS Bar Item image displaying wrong color

I have a bar with Bar Items, my .png image has green color, but when i add it to storyboard it's displaying ... it display the image as it 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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623 views

1 answer

swift - Custom segue transition animation

I'm working on an app that utilizes the navigation controller. I have a certain view controller that has ... the default transition animation? See Question&Answers more detail:os...

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

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520 views

1 answer

swift - Array of Nested Type: Why Does the Compiler Complain?

class ClassA { class ClassB { } } let compiles: [ClassA.ClassB] let doesNotCompile = [ClassA.ClassB]() Playground ... = ClassA.ClassB ^ ~~ See Question&Answers more detail:os...

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

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782 views

1 answer

swift - How to get the index of the element in the List in SwiftUI when the List is populated with the array?

In my SwiftUI app, I have a list of items. I'm using the array of MenuItems to fill in the list struct ... the item in the List in SwiftUI? See Question&Answers more detail:os...

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

0 votes

691 views

1 answer

swift - How to transpose an array of strings

I've a txt including some data in the following format. AYGA:GKA:GOROKA:GOROKA:PAPUA NEW GUINEA:06:04:54:S:145:23: ... ["5282", "0000", "0020"] See Question&Answers more detail:os...

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

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736 views

1 answer

swift - Function does not wait until the data is downloaded

I have the following function which downloads an image from server; func getImageFromServerById(imageId: String) -> ... wait for the download? See Question&Answers more detail:os...

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

0 votes

777 views

1 answer

swift - Convert array of unicode code points to string

Given an array of strings that represent unicode code points: let arr : [String] = ["0023", "FE0F", "20E3"] ... example, the output would be #?? See Question&Answers more detail:os...

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

0 votes

825 views

1 answer

swift - How to get indexPath when image inside cell tapped

I would like to implement feature that if profileImage tapped in tableviewCell, segue to detailView. I add tapGesture ... Thank you in advance! See Question&Answers more detail:os...

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

0 votes

699 views

1 answer

swift - Firebase Authentication: Password must contain capital letter

My application is linked with firebase database and authentication. When a user creates an account, the only requirements ... this from my code? See Question&Answers more detail:os...

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

0 votes

644 views

1 answer

swift - Returning a value from a function with Alamofire and SwiftyJson

I have an app that returns a menu of information (basically menus, menu_headers, and items). I'd like to have ... very quickly (ie Swift 1.1) See Question&Answers more detail:os...

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

0 votes

588 views

1 answer

swift - SwiftUI: Can't get the transition of a DetailView to a ZStack in the MainView to work

I can't find the answer to this anywhere, hopefully one of you can help me out. I have a MainView with some ... can help me out! Thanks :) See Question&Answers more detail:os...

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

0 votes

472 views

1 answer

swift - Why only my last local notification function is getting called?

I'm fairly new to swift and am trying to call multiple functions that request a local notification inside a ... , withCompletionHandler: nil) } See Question&Answers more detail:os...

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

0 votes

946 views

1 answer

swift - AVAudioEngine downsample issue

I'm having an issue with downsampling audio taken from the microphone. I'm using AVAudioEngine to take samples ... is very much appreciated. See Question&Answers more detail:os...

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

0 votes

614 views

1 answer

swift - UITableViewAutomaticDimension Not Working for Resizing Cell Height

My cell displays fine as long as I don't try to enable the automatic resizing. When I add the two lines for auto- ... : ["date":dateLbl])) } } See Question&Answers more detail:os...

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

0 votes

589 views

1 answer

swift - Trouble using callbacks with CGPattern in Swift3

I'm attempting to create a colored pattern using CGPattern in Swift. Apple provides a nice Objective-C example ... syntax to complete this? See Question&Answers more detail:os...

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

0 votes

974 views

1 answer

swift - How to Change back button title on navigation controller in swift3?

I want to change the title of?backbutton to any name in swift 3.I tried many ways but none of them ... .window?.backgroundColor = UIColor.white See Question&Answers more detail:os...

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

0 votes

789 views

1 answer

swift - What causes 'Constant captured by a closure before being initialized' error

In a following class class Foo { let _defaultValue = "N/A" let value: String init (dict: NSDictionary) { ... happier in the second case? See Question&Answers more detail:os...

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

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