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Xcode 12.4 freezes on MacBook Pro Apple M1

It is impossible to work. It freezes on each launch. It takes a lot of time. I've turned off my Apple Watch, disabled the connect via network. No progress on my computer. The UI does not responds, the build does not progress. I do not see any overload in the activity monitor. CPU is below 1%. It takes 1.90GB the real memory, 393GB virtual. Sometimes I see "Xcode (Not Responding)". There are other com.apple.dt.Xcode.* processes I do not know how to solve it. I'm trying to wait, I'm trying to kill Xcode,... nothing helps MacBook Pro M1, Big Sur, Xcode 12.4 Do you know how it can be fixed?
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by Pavel V.
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'import OSLog' - could not build

'import OSLog' compiles well in all Xcode beta version including the 12.2, but makes an error "could not build Objective-C module 'OSLog'" in Xcode 12 release. Replacing with 'import os.log' works. I do not understand and cannot explain it. What is wrong?
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by Pavel V.
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Country name in iOS 13. NSLocale

An old code detecting the full country name fails under iOS 13 (Beta 3): NSString *displayNameString = [[NSLocale currentLocale] displayNameForKey:NSLocaleCountryCode value:@"FR"];displayNameString is nil.You can check yourself this sample: NSLocale *currentLocale = [NSLocale currentLocale]; NSString *countryCode = [currentLocale objectForKey:NSLocaleCountryCode]; NSString *displayNameString = [[NSLocale currentLocale] displayNameForKey:NSLocaleCountryCode value:countryCode];Is it a bug in iOS? Is there another way to detect the country name?
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by Pavel V.
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EXC_BAD_ACCESS for URLForUbiquityContainerIdentifier

The following line always causes a crash under iOS 13:[[NSFileManager defaultManager] URLForUbiquityContainerIdentifier:nil];The error EXC_BAD_ACCESS (code=2, address=0x....)It happens for me only?I've tested ше on an iOS 12 device - works fine, no crash.Regards,Pavel
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by Pavel V.
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Silent notification to track uninstall

I see many companies, many services detecting the app uninstall. But for us it does not work: we always receives 200 in respond from APNS. The app was uninstalled 5 days ago, but we are sending a silent push and receive 200 in respond from Apple.The payload:{"aps":{"content-available":1},"tr":"0:2049:1975810513:5211877005877838604:465"}Everything's implemented as described here:https://developer.apple.com/library/archive/documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/CommunicatingwithAPNs.html#//apple_ref/doc/uid/TP40008194-CH11-SW15https://developer.apple.com/documentation/usernotifications/setting_up_a_remote_notification_server/pushing_updates_to_your_app_silentlyGuys, please tell what's going wrong? Regards,Pavel
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by Pavel V.
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