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Asked: 2 years agoIn:
Teacher

I’m having trouble with my self-implemented audio player. I have a class called `Player` with a `play()` method that takes an audio file path and plays it using `AVPlayer`. However, I keep getting the error `Cannot assign to property: ‘self’ ...Read more

I’m having trouble with my self-implemented audio player. I have a class called `Player` with a `play()` method that takes an audio file path and plays it using `AVPlayer`. However, I keep getting the error `Cannot assign to property: ‘self’ is immutable` on this line of code:
“`Swift
let player = AVPlayer(url: URL(fileURLWithPath: filePath))
“`
I know that I can fix this error by adding the keyword `unowned` or `weak` before `self` like this:
“`Swift
let playerItem = AVPlayerItem(url: URL(fileURLWithPath: filePath))
let player = AVPlayer(playerItem: playerItem)
player.automaticallyWaitsToMinimizeStalling = false
player.actionAtItemEnd = .none
player.addPeriodicTimeObserver(forInterval: CMTimeMakeWithSeconds(1, preferredTimescale: 1), queue: DispatchQueue.main) { [unowned self] time in
// update player UI
}
self.player = player
“`
However, I would like to know the reason behind this error and when to use `unowned` or `weak` in Swift. Also, is there any other alternative for this error, besides using `unowned` or `weak`? Can you give an example of a scenario where it’s better to use `weak` over `unowned` and vice versa?

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debuggingimmutabilityiOSproperty assignmentswift
  1. utxpiv_ Begginer

    The error "libpng warning iccp known incorrect sRGB profile" usually occurs when an image has an incorrect profile. To resolve this issue, open the image using a photo editing software and make sure it is saved without any color profile or with a proper sRGB color profile. Sometimes this error is alRead more

    The error “libpng warning iccp known incorrect sRGB profile” usually occurs when an image has an incorrect profile. To resolve this issue, open the image using a photo editing software and make sure it is saved without any color profile or with a proper sRGB color profile.
    Sometimes this error is also generated because the image is missing a profile, so to fix this, you can set the color profile of your image before saving it. This can be done using a photo editing software or command-line tools like ImageMagick.
    In my personal experience, I had encountered this error while working on a web project. I had to make sure that all the images used on my website were optimized and saved with the correct color profile. This helps in reducing the page load time while maintaining the color quality of the images.
    To troubleshoot this error, it is also recommended to check if your code is properly handling the image files and loading them in the correct format. Sometimes, the issue may not be with the image itself but with the way it is being processed and loaded. By following these steps and practices, you can avoid this error and ensure that all the images on your website or application are displayed correctly.

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    • 30
Asked: 4 years agoIn:
Teacher

I am struggling with a problem related to unwrapping optional values in my Swift app. I have created an app that receives data from a server and then displays it to the user. However, every time I change the network ...Read more

I am struggling with a problem related to unwrapping optional values in my Swift app. I have created an app that receives data from a server and then displays it to the user. However, every time I change the network state from connected to disconnected, the app crashes with the following error message: “fatal error: unexpectedly found nil while unwrapping an Optional value”.
This error message has been confusing me because I am not using any optional variables in my code. I have checked the code multiple times, but I can’t seem to find where the error is coming from. Can anyone help me figure out what is causing this error and how I can fix it? Here is a section of my code that receives the data from the server and parses it:
“`
let url = URL(string: “http://example.com/data”)
let task = URLSession.shared.dataTask(with: url!) {(data, response, error) in
guard let data = data else {
print(“Error: No data received”)
return
}
// Parse JSON data
do {
let json = try JSONSerialization.jsonObject(with: data, options: [])
if let dict = json as? [String:Any] {
print(dict)
}
else {
print(“Error: JSON is not a dictionary”)
}
}
catch {
print(“Error: Failed to parse JSON data”)
}
}
task.resume()
“`
I would appreciate any help or advice on how I should proceed with solving this error. Thank you in advance!

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fatal errorniloptionalswift
  1. utxpiv_ Begginer

    The error "libpng warning iccp known incorrect sRGB profile" usually occurs when an image has an incorrect profile. To resolve this issue, open the image using a photo editing software and make sure it is saved without any color profile or with a proper sRGB color profile. Sometimes this error is alRead more

    The error “libpng warning iccp known incorrect sRGB profile” usually occurs when an image has an incorrect profile. To resolve this issue, open the image using a photo editing software and make sure it is saved without any color profile or with a proper sRGB color profile.
    Sometimes this error is also generated because the image is missing a profile, so to fix this, you can set the color profile of your image before saving it. This can be done using a photo editing software or command-line tools like ImageMagick.
    In my personal experience, I had encountered this error while working on a web project. I had to make sure that all the images used on my website were optimized and saved with the correct color profile. This helps in reducing the page load time while maintaining the color quality of the images.
    To troubleshoot this error, it is also recommended to check if your code is properly handling the image files and loading them in the correct format. Sometimes, the issue may not be with the image itself but with the way it is being processed and loaded. By following these steps and practices, you can avoid this error and ensure that all the images on your website or application are displayed correctly.

    See less
    • 30
Asked: 4 years agoIn:
Teacher

I’m a beginner in Swift and I’m trying to concatenate two strings together. I’ve tried using the + operator in between the two strings, but I’m getting an error saying that the operands don’t match. Can someone please help me ...Read more

I’m a beginner in Swift and I’m trying to concatenate two strings together. I’ve tried using the + operator in between the two strings, but I’m getting an error saying that the operands don’t match. Can someone please help me figure out what I’m doing wrong?
Here’s the code that I’ve been trying to use:

let str1: String = "Hello"
let str2: String = "World"
let result: String = str1 + str2

When I try to run this code, I get the error message “Binary operator ‘+’ cannot be applied to two ‘String’ operands”. I’ve looked online to try to find a solution, but I haven’t been able to find any helpful information.
Can someone please explain to me what I’m doing wrong? How can I concatenate two string variables in Swift without getting this error? I appreciate any help that you can provide. Thank you!

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ios-developmentstring-concatenationstring-manipulationswiftxcode
  1. utxpiv_ Begginer

    The error "libpng warning iccp known incorrect sRGB profile" usually occurs when an image has an incorrect profile. To resolve this issue, open the image using a photo editing software and make sure it is saved without any color profile or with a proper sRGB color profile. Sometimes this error is alRead more

    The error “libpng warning iccp known incorrect sRGB profile” usually occurs when an image has an incorrect profile. To resolve this issue, open the image using a photo editing software and make sure it is saved without any color profile or with a proper sRGB color profile.
    Sometimes this error is also generated because the image is missing a profile, so to fix this, you can set the color profile of your image before saving it. This can be done using a photo editing software or command-line tools like ImageMagick.
    In my personal experience, I had encountered this error while working on a web project. I had to make sure that all the images used on my website were optimized and saved with the correct color profile. This helps in reducing the page load time while maintaining the color quality of the images.
    To troubleshoot this error, it is also recommended to check if your code is properly handling the image files and loading them in the correct format. Sometimes, the issue may not be with the image itself but with the way it is being processed and loaded. By following these steps and practices, you can avoid this error and ensure that all the images on your website or application are displayed correctly.

    See less
    • 30
Asked: 6 years agoIn:
Teacher

I’m currently building an iOS application using SwiftUI, and I’m running into issues when trying to conform to a protocol with generics. I have a protocol called `ListViewProtocol` that has an associated type `DataType` and requires a function called `setup(withData ...Read more

I’m currently building an iOS application using SwiftUI, and I’m running into issues when trying to conform to a protocol with generics. I have a protocol called `ListViewProtocol` that has an associated type `DataType` and requires a function called `setup(withData data: DataType)`. I then have a struct called `MyListView` that conforms to this protocol, and I’ve defined `DataType` as `String`.

However, when I try to create a view that uses `MyListView` and passes in an array of strings, I get the error message “Type ‘AnyView’ cannot conform to ‘View’ on protocol ‘ListViewProtocol'”. This error is occurring on the line `return AnyView(MyListView(data: myStringArray))`. I’m not sure why this error is being thrown, as I believe I’m conforming to the `ListViewProtocol` correctly.

Here is some example code to illustrate the issue:

“`swift
protocol ListViewProtocol {
associatedtype DataType
func setup(withData data: DataType)
}

struct MyListView: ListViewProtocol {
typealias DataType = String

func setup(withData data: DataType) {
// do something with data
}
}

struct ContentView: View {
let myStringArray = [“String 1”, “String 2”, “String 3”]

var body: some View {
return AnyView(MyListView(data: myStringArray))
}
}
“`

Any help with this issue would be greatly appreciated. Let me know if you need any more information or code snippets to better understand the problem.

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generic-typesprotocolsswifttype-constraintsviews
  1. utxpiv_ Begginer

    The error "libpng warning iccp known incorrect sRGB profile" usually occurs when an image has an incorrect profile. To resolve this issue, open the image using a photo editing software and make sure it is saved without any color profile or with a proper sRGB color profile. Sometimes this error is alRead more

    The error “libpng warning iccp known incorrect sRGB profile” usually occurs when an image has an incorrect profile. To resolve this issue, open the image using a photo editing software and make sure it is saved without any color profile or with a proper sRGB color profile.
    Sometimes this error is also generated because the image is missing a profile, so to fix this, you can set the color profile of your image before saving it. This can be done using a photo editing software or command-line tools like ImageMagick.
    In my personal experience, I had encountered this error while working on a web project. I had to make sure that all the images used on my website were optimized and saved with the correct color profile. This helps in reducing the page load time while maintaining the color quality of the images.
    To troubleshoot this error, it is also recommended to check if your code is properly handling the image files and loading them in the correct format. Sometimes, the issue may not be with the image itself but with the way it is being processed and loaded. By following these steps and practices, you can avoid this error and ensure that all the images on your website or application are displayed correctly.

    See less
    • 30