Hi, My customer wants to do the thing where an app store URL is advertised which contains a referral code. When a user follows the link, it should take them to the app store to install the app, and then when the app is installed, it should be able to get access to the referral code in the original URL. I know such a thing was possible at one time because I remember talking to some of my colleagues about it, but I have never done it myself and whatever my coworkers did 8 years ago in Objective-C probably doesn't work anymore. Can someone let me know how to do this, or at least, let me know what the correct name for this procedure is so I can look it up? Thanks.

I need to decode JSON into a class. The JSON has a field called "Type", and I cannot declare a property with that name in my class since Type is a reserved word. I tried declaring CodingKeys, but that doesn't work unless I declare EVERY property in the CodingKeys. This class has about a hundred properties and I have others like it, I do not want to do this. Is there a better solution?

I'm building a custom camera screen that displays the camera image on a preview layer and then captures an image, using AVCaptureSession. When the picture is captured, I immediately load it into a UIImageView in order to display it to the user for approval. I've actually done this many times before, but this is the first time I've tried to do it in an app that supports interface rotation. If I hold the phone in Portrait mode and capture a picture, everything works as expected. When the user rotates the phone into Landscape orientation, I detect this and I replace the preview layer (AVCaptureVideoPreviewLayer) with a new one, specifying connection.videoRotationAngle in order to make the image appear in the right orientation. I'm a little surprised that this is necessary, and it's not a smooth transition, but that doesn't matter. What does matter is that when I capture the image, it is in the wrong orientation. I tried rotating it myself, but this doesn't seem to make any difference. What am I doing wrong?

Hi,Usually when you create a new class or other file in Xcode, the default location of the new file is a folder with the same name as your project.Somehow, I've ended up with a project where the default location for new files is the folder above this (the one with the .xcodeproj file in it). I can certainly change the folder whenever I make a new file, if I remember to do it, but often I forget, and end up with half my files in one place and half in the other.What controls this default, and how can I change it back to the folder I want?Thanks.

Hi,How do I check to see if a Character is in a Character Set?In Objective-C, I could write:[[NSCharacterSet lowercaseLetterCharacterSet] characterIsMember:c]Where "c" is a variable of type char.In Swift, I tried to write:CharacterSet.lowercaseLetters.contains(c)Where "c" is of type Character, but I received an error saying that the function was expecting a parameter of type "Unicode.Scalar".Thanks,Frank

I've always understood it to be the case that apps could permit users to log in or use a code to access paid content, as long as the app did not direct the user to an external web site to make a purchase. For example, apps like Netflix or Kindle.My app isn't even doing anything close to this. I have an app in which digital content is unlocked via in-app purchase. Occasionally I give away promo codes that allow a user to unlock one free piece of content. These codes can only be used once, and are distributed in very limited numbers on cards, in person, at events like trade shows.My app has been in the store for about four years using this method. This week I attempted to publish a small bug-fix update, and was flagged by Apple and told that my use of Promo Codes in this manner violates the rules.What happened here? Did Apple misunderstand what my app is doing? Did the rules change recently and I was unaware of the change? Has this always been against the rules, but either Apple didn't enforce it before or they never reviewed my app thorougly enough to find it?Thanks,Frank

Hi,I have an app that includes a very simple one-button interface for recording a video. Our customer wants to be able to switch between the front and rear cameras while the video is being recorded, and without any interruption in the video stream. I notice that even the iOS built-in camera app doesn't do this, but I've heard that some third-party apps do.Is this possible in a practical way? If so, how would I go about it?Thanks,Frank

I'm getting this message when I try to install Xcode, it says there is not enough disk space.I checked my main volume and there is 60GB available.I'm assuming that Xcode can't possibly require more than 60GB and that this message is a mistake. How do I fix it?Thanks,Frank

I've seen examples of Swift code with #if DEBUG / #endif, and have even used it myself.I know exactly how preprocessor macros work in c, c++ and Objective-C. In those languages, I know I can say:#ifdef DEBUG ... some code ...#endifAnd I know that if the DEBUG flag is false at build time, the code will not only not run, but it won't even be compiled. This is important to me because the code inside that block contains some sensitive information that must not end up in my compiled code for non-debug builds.In Swift, I'm really not sure what happens. I know the code doesn't execute, but I'm also told that Swift doesn't have a preprocessor. So, what exactly is going on here?Specifically, can I hide sensitive information inside an #if DEBUG block in Swift and be assured that it won't get compiled or in any way be present in the executable when the DEBUG flag is false? Or is #if DEBUG evaluated at runtime in Swift?Thanks,Frank

We have an auto-renewable subscription in our app that we want to stop offering. However, we want to make sure that people who have already purchased the subscription remain subscribed until the end of their current subscription period (and are subsequently unsubscribed and not charged further). What is the right way to do this?We tried submitting the app with the subscription still enabled in App Store Connect but hidden in the app, and our update was rejected because the reviewer couldn't find a way to subscribe.Thanks,Frank

I'm trying to save a Dictionary to UserDefaults. My Dictionary is defined as [String:Data]. Since both String and Data are property objects, I expected this to work, but it doesn't: my app blows up with a "this class is not key-value coding compliant" error. Is this a bug, or am I doing something wrong?

I want to send my app silent push notifications while it is running in the background, but I've been unable to get it to work. I understand how to send the notification by setting the content-available flag, and I've implemented the "didReceiveRemoteNotification" function in my app delegate. It works, but only if the app is open and running in the foreground. As soon as I put it in the background, didReceiveRemoteNotification doesn't get called again unless I reopen the app. I feel certain that I should be able to receive these notifications when my app is in the background. I have both "Remote notifications" and "Background processing" checked in Signing & Capabilities. Thanks, Frank

I'm working on a BLE app with a hardware partner using samples of their device, which I am able to erase and re-flash when needed. When I try to use the device it initially works fine. I can connect to it, make requests, and get back responses. However, after a short time and a few successful runs, I start getting the error "Encryption is insufficient". The error is seen in the "didUpdateValueFor" function. I can still connect to the device, and enumerate all of its services and characteristics, but I can't read any data. If at this point I re-flash the device and also go into the iOS setting app and "forget" it, then I can use the device normally again, at least for a while. What causes this? Is there a way I can fix it in my app? Thanks, Frank

I'm not getting any values from the floorsAscended or floorsDescended properties of CMPedometerData. I tested it by walking up and down a flight of stairs twice while monitoring for pedometer updates for 60 seconds. I also queried for the pedometer data separately at the end of the time period in case there were any updates I missed. I'm using an iPhone 13 pro for my tests and I did check to make sure CMPedometer.isFloorCountingAvailable() is true, and I am getting other kinds of pedometer data such as distance, pace, and steps. Is there something else I need to do in order to enable floor counting? Thanks, Frank

I added this file as Apple requested due to my app using UserDefaults, but it still complains when I upload it. This is the message: TMS-91053: Missing API declaration - Your app’s code in the “Production” file references one or more APIs that require reasons, including the following API categories: NSPrivacyAccessedAPICategoryUserDefaults. And this is my file, what's wrong? <dict> <key>NSPrivacyAccessedAPITypes</key> <array> <dict> <key>NSPrivacyAccessedAPIType</key> <string>NSPrivacyAccessedAPICategoryUserDefaults</string> <key>NSPrivacyAccessedAPITypeReasons</key> <array> <string>CA92.1</string> </array> </dict> </array> </dict>