We are creating a watch party app that allows you to video chat with your friends and play a YouTube video at the same time. The video is played using Google's youtube-ios-player-helperlibrary which uses a WKWebView with their iframe API, as that's the only way to play it without violating the Terms of Service. We need the ability to change the volume of the YouTube video separately from the video chat, so you can hear your friends over the video for example. Unfortunately it's not possible to directly change the volume because iOS does not support changing the volume via JavaScript - https://developer.apple.com/library/archive/documentation/AudioVideo/Conceptual/Using_HTML5_Audio_Video/Device-SpecificConsiderations/Device-SpecificConsiderations.html#//apple_ref/doc/uid/TP40009523-CH5-SW10, unlike macOS. Setting volume doesn't do anything and getting it always returns 1. Users can change the volume with the hardware buttons but this applies to all audio including the video chat, not just the YouTube video. Someone found a workaround - https://stackoverflow.com/a/37315071/1795356 to get the underlying AVPlayer and change its volume natively. This worked with UIWebView but does not work now that it uses WKWebView. What can be done to change the volume of the YouTube video?

iOS 14 users can change the default email app. What effect, if any, does this have on MFMailComposeViewController? Currently if canSendMail() returns false I instruct the user to set up an account in the Mail app. Maybe the wording needs to be different?

Given an Apple Music trackId is it possible to query the user’s media library to see if they’ve added it to their library? Something like: let predicate = MPMediaPropertyPredicate(value: "1440818675", forProperty: MPMediaItemPropertyPersistentID) let query = MPMediaQuery(filterPredicates: Set([predicate])) let songs = query.items let isInLibrary = !songs.isEmpty

I am trying to figure out how to programatically install a per-user launchd agent - I have an executable Swift script I wrote and I need macOS to enforce it always be running. I found the SMJobBless sample code which I could play with to see how this works, but it hasn't been updated since it was last built with Xcode 4.6. As you can imagine it doesn't compile in Xcode 10. I was able to get it to build by upgrading to the recommended project settings, increasing the deployment target, and selecting my team for the two targets. Following the ReadMe I need to run ./SMJobBlessUtil.py setreq to configure the Info.plists appropriately. These instructions are out of date but eskimo was kind enough to provide updated instructions here to find the .app url. But when I do this and run the command I receive the following output:MacBook:SMJobBless Jordan$ ./SMJobBlessUtil.py setreq /Users/Jordan/Library/Developer/Xcode/DerivedData/SMJobBless-dffakkidazmiowcishyrborysygm/Build/Products/Debug/SMJobBlessApp.app SMJobBlessApp/SMJobBlessApp-Info.plist SMJobBlessHelper/SMJobBlessHelper-Info.plist Traceback (most recent call last): File "./SMJobBlessUtil.py", line 424, in main() File "./SMJobBlessUtil.py", line 418, in main setreq(appArgs[1], appArgs[2], appArgs[3:]) File "./SMJobBlessUtil.py", line 360, in setreq appToolDict[bundleID] = toolNameToReqMap[bundleID] KeyError: '$(PRODUCT_BUNDLE_IDENTIFIER)'It would seem this python script isn't able to work with the newer project structures, not surprisingly. I wasn't able to find any other information on how to accomplish this task in the modern days. So could you please explain how to go about this? 🙂I have an executable .swift file and a .plist that works when loaded from ~/Library/LaunchAgents/ ready to be added to an existing Xcode project. Thanks!

It was discussed in What's New in Photos APIs at WWDC that we should avoid using NSPredicate for custom fetch options if at all possible for performance purposes. In my app, I'm using NSPredicate to get only images from the user's library. I'm not seeing an API that would allow me to get assets from a specific collection filtered to just images without the use of NSPredicate though. Is there a more efficient way to perform this query that I'm not seeing?let photoLibraryFetchResult = PHAssetCollection.fetchAssetCollections(with: .smartAlbum, subtype: .smartAlbumUserLibrary, options: nil) let assetCollection = photoLibraryFetchResult.firstObject! let fetchOptions = PHFetchOptions() fetchOptions.predicate = NSPredicate(format: "mediaType = %d", PHAssetMediaType.image.rawValue) let fetchResults = PHAsset.fetchAssets(in: assetCollection, options: fetchOptions)