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UniversalLink

I know universal link(Assocaited domains) can be used for web to app communication. Can we use the same for app to app communication?
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Authenticate with server

Is there any mechanism to generate a unique string/token(like UUID/ identifierForVendor) in device and verify the same in host/server?
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On Demand Resource

I am loooking for architecture diagram on how on demand resource works and wanted to know how to host the images/assets in the appstore to download the content on demand.I believe app need to specify the server where images are hosted and Apple will download on behalf of the developer and it can be accessed through beginAccessingResourcesWithCompletionHandler . If its true, what if the individual developer doesn't have a server/cloud storage.
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Time complexity

I believe time complexity for rangeOfString:options method is O(n) and for componentsSeperatedByString is also O(n). If its correct, please let me know whether any method available with better time complexity.
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Storing static string secure

I want to store static NSString securely. I am storing in plist file but its not secure as it can retrieved if anyone gets IPA. Is there any way to store a string or token securely?
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willAnimateRotationToInterfaceOrientation

willAnimateRotationToInterfaceOrientation - this deprecated API is getting called when app enters background and "toOrientation" is incorrect.If I put the app in background when the device is in portrait, willAnimateRotationToInterfaceOrientation is getting called andtoInterfaceOrientation is set to LandscapeLeft.
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Storing hardcoded string securely in app

I wanted to store a static/hardcoded string isecurely within the app. Can we use keychain for this purpose. If yes, Is there any sample app to learn how to store static string securly and retrieve them.
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Is there a way to know whether device is Jailbroken

Is there a way to know whether device is Jailbroken? I am working on feature which needs more security. I know we can't access appstore from Jailborken device. Is there a way to sideload the IPA file in JailBroken device . If yes, is there a way to know whether device is Jailbroken so that we can restrict the user to use the app?
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deviceCheck API usage

I know device check is set and get two bit information. Can we use that API directly or indirectly to store and get app/jws/jwt tokens?
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referrerURL in iOS 9/10

This is related to Universal link. referrerURL parameter is available only in iOS 11/12. I wanted to take user back to the referal URL in some use cases. Is there any workaround for iOS9/10 to get the referal URL? If no, can we open Safari app programatically without passing the URL.
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Accessing private methods

Is there a way to access a method with 4 parameters which is not declared in header file?
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Adding Location tag in metadata

We would like to add "Location : This app may use your location even when it isn't open, which can decrease battery life." tag under "Information" section in app description/metadata. We don't see any field in iTunesConnect/AppstoreConnect to add this field. Could anyone please let us know the steps to add this "Location" tag when we submit the app for review next time. Please let me know if any document available in the developer portal.
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Couldn't install the app signed with enterprise provisioning profile via OTA in iOS 12.3.1 and iOS 12.3.2

I couldn't install the app signed with enterprise provisioning profile via OTA in iOS 12.3.1 and iOS 12.3.2. In order to install the app, I have to turn off the wifi and restart the device and there after I am able to download and install the IPA.I took the device logs from console when installed failed and copied the error code from the device log. default 11:10:06.455386 -0400 appstored -[IXServerConnection _client_coordinatorWithUUID:didCancelWithReason:client:]_block_invoke: Messaged with uuid 5D787B13-31A7-402F-9D67-5C3C7678C082 to cancel with reason Error Domain=SSErrorDomain Code=3 "Unhandled exception" UserInfo={SSErrorHTTPStatusCodeKey=404, NSLocalizedFailureReason=An unknown error occurred, NSLocalizedDescription=Unhandled exception}; found 1 coordinators to canceldefault 11:10:06.455529 -0400 appstored -[IXAppInstallCoordinator _clientDelegate_didCancelWithError:client:]: <IXInitiatingAppInstallCoordinator<0x1072328f0> identifier:com.xx.*** uuid:5D787B13-31A7-402F-9D67-5C3C7678C082 creator:App Store>: Got cancel delegate with reason Error Domain=SSErrorDomain Code=3 "Unhandled exception" UserInfo={SSErrorHTTPStatusCodeKey=404, NSLocalizedFailureReason=An unknown error occurred, NSLocalizedDescription=Unhandled exception} client App Storedefault 11:10:06.455584 -0400 installcoordinationd -[IXSClientConnection _client_coordinatorWithUUID:didCancelWithReason:client:]: Dispatching _client_coordinatorWithUUID:uuid didCancelWithReason:cancelReason client:client to <IXSClientConnection<0x10222dcb0> client:appstored (pid 146)>Please let me know if there is any resolution
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iPhone Xs Max Status bar style

Status bar style is dark in iPhone Xs Max iOS 12.2 even though style is set to UIStatusBarStyleLightContent. I couldn't reproduce in other device models. UIStatusBarStyleLightContent style is not depricated and more over no new style got introduced in iOS 12.2 Is this as iOS bug?
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Convert FetchRequest Array to JSON

Is there a way to convert the FecthRequest Array to JSON or all the rows /entries in core data to JSON.
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