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I this FAQ it says: What happens when I turn off iCloud Keychain on a device? When you turn off iCloud Keychain for a device, you're asked to keep or delete the passwords and credit card information that you saved. If you choose to keep the information, it isn't deleted or updated when you make changes on other devices. If you don't choose to keep the information on at least one device, your Keychain data will be deleted from your device and the iCloud servers.  So understand data stored by the user such as passwords is removed. What about data stored by an app installed on an iOS device? Is it removed as well? Can we assume that data stored in the keychain will not be removed by other means external to the app, or should we plan our app to handle such situation?

I receive a buffer from[AVSpeechSynthesizer convertToBuffer:fromBuffer:] and want to schedule it on an AVPlayerNode. The player node's output format need to be something that the next node could handle and as far as I understand most nodes can handle a canonical format. The format provided by AVSpeechSynthesizer is not something thatAVAudioMixerNode supports. So the following:   AVAudioEngine *engine = [[AVAudioEngine alloc] init];   playerNode = [[AVAudioPlayerNode alloc] init];   AVAudioFormat *format = [[AVAudioFormat alloc] initWithSettings:utterance.voice.audioFileSettings];   [engine attachNode:self.playerNode];   [engine connect:self.playerNode to:engine.mainMixerNode format:format]; Throws an exception: Thread 1: "[[busArray objectAtIndexedSubscript:(NSUInteger)element] setFormat:format error:&nsErr]: returned false, error Error Domain=NSOSStatusErrorDomain Code=-10868 \"(null)\"" I am looking for a way to obtain the canonical format for the platform so that I can use AVAudioConverter to convert the buffer. Since different platforms have different canonical formats, I imagine there should be some library way of doing this. Otherwise each developer will have to redefine it for each platform the code will run on (OSX, iOS etc) and keep it updated when it changes. I could not find any constant or function which can make such format, ASDB or settings. The smartest way I could think of, which does not work:   AudioStreamBasicDescription toDesc;   FillOutASBDForLPCM(toDesc, [AVAudioSession sharedInstance].sampleRate,                      2, 16, 16, kAudioFormatFlagIsFloat, kAudioFormatFlagsNativeEndian);   AVAudioFormat *toFormat = [[AVAudioFormat alloc] initWithStreamDescription:&toDesc]; Even the provided example for iPhone, in the documentation linked above, uses kAudioFormatFlagsAudioUnitCanonical and AudioUnitSampleType which are deprecated. So what is the correct way to do this?

How to deduce from NSMethodSignature that a struct argument is passed by pointer? Specifically on ARM. For example if I have: @protocol TestProtocol <NSObject> - (void)time:(CMTime)time; - (void)rect:(CGRect)point; @end And then I do: struct objc_method_description methodDescription1 = protocol_getMethodDescription(@protocol(TestProtocol), @selector(time:), YES, YES); struct objc_method_description methodDescription2 = protocol_getMethodDescription(@protocol(TestProtocol), @selector(rect:), YES, YES); NSMethodSignature *sig1 = [NSMethodSignature signatureWithObjCTypes:methodDescription1.types]; NSMethodSignature *sig2 = [NSMethodSignature signatureWithObjCTypes:methodDescription2.types]; const char *arg1 = [sig1 getArgumentTypeAtIndex:2]; const char *arg2 = [sig2 getArgumentTypeAtIndex:2]; NSLog(@"%s %s", methodDescription1.types, arg1); NSLog(@"%s %s", methodDescription2.types, arg2); The output is: v40@0:8{?=qiIq}16 {?=qiIq} v48@0:8{CGRect={CGPoint=dd}{CGSize=dd}}16 {CGRect={CGPoint=dd}{CGSize=dd}} Both look similar, no indication that CMTime will be actually passed as a pointer. But when I print the debug description: NSLog(@"%@", [sig1 debugDescription]); NSLog(@"%@", [sig2 debugDescription]); The first prints: ... argument 2: -------- -------- -------- -------- type encoding (^) '^{?=qiIq}' flags {isPointer} ... While the second prints: ... argument 2: -------- -------- -------- -------- type encoding ({) '{CGRect={CGPoint=dd}{CGSize=dd}}' flags {isStruct} ... So this information is indeed stored in the method signature, but how do I retrieve it without parsing the debug description? Are there rules I can use to deduce this myself? I tried to experiment with different structs but it is hard to spot a pattern.

To reproduce: Create a new standard iOS project and add a Widget extension to it. Download an SVG from here: https://pixabay.com/vectors/flourish-decorative-ornamental-3166119/ Add the SVG asset into Assets.xcassets. Replace the line Text(entry.date, style: .time) with Image("flourish-3166119").frame(width: 20). When running the extension, I get Thread 1: EXC_RESOURCE RESOURCE_TYPE_MEMORY (limit=30 MB, unused=0x0). Notice that the asset is only 8k but something in the rendering of the SVG into bitmap cause a memory spike. I tested this with Xcode 13.0, iOS 14.4.1 Xs MAX device. Is there a way to overcome this, or should I dump SVG and pre render the images for x2 and x3 scale factors and call it a day? Edit: Just to clarify, the issue happens with only 1 entry as well. I attached the full source for reference. Demo convenience:

The default behaviour is that selecting an item will dismiss the menu. I see that some Apple's apps have items which will do some action but keep the menu open. For example in Notes, there is Indent item which will indent the text but keep the menu open. Is it possible to achieve this with the public API?

I am trying to implement my own version of UIMenuController. One of the things I am struggling to imitate is what happens when a there is a touch event outside the menu. In this case the menu will be dismissed, but the event will also be passed to the correct view . So I need somehow to handle or capture the event in the menu or some transparent view covering the whole screen but also let it pass to the view below it. One idea is to override hitTest:withEvent: of the menu view, dismiss the menu when it is called (if point is outside the menu) and then return nil as if it was transparent to events. The issue is that hitTest:withEvent: must be pure function without side effect. On other hand, when touchesBegan:withEvent: is called, it is possible dismiss the menu and to pass the event to the nextResponder, but the view directly below the menu is not necessarily the superview of the menu view, so it is not part of the responder chain.

I downloaded Xcode 12.5 Beta and now an existing project does not compile with errors telling I can't use Class as a key in NSDictionary. Cannot initialize a parameter of type 'id&lt;NSCopying&gt;  _Nonnull const __unsafe_unretained' with an rvalue of type 'Class' I have assumes so far that while Class does not conform to NSCopying, it is safe to use as a dictionary key because it implements copy and copyWithZone:. Did anything change with that regard in the compiler/runtime shipped with Xcode 12.5? Is it safe (and endorsed practice) to cast to id&lt;NSCopying&gt; to silence these errors?