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Lio has asked 13 questions and find answers to 31 problems.

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Lio questions

WidgetKit doesn't work in Simulator on M1, any ideas?
Find out how many arguments a block needs
Is it ok to call performSelectorOnMainThread: after beginBackgroundTaskWithExpirationHandler is called and the application is in background?
Private methods using Categories in Objective-C: calling super from a subclass
Traversing key/values of an NSDictionary, is enumerateKeysAndObjectsUsingBlock more efficient than looping keys and calling objectForkey:?
Objective-c asynchronous communication: target/action or delegation pattern?
What is GCC_NO_COMMON_BLOCKS used for?
Why should I choose GCD over NSOperation and blocks for high-level applications?
What's the difference between DWARF and DWARF with dSYM file?

Lio answers

Facebook request thread problem
Protocol Extensions and subclasses
iOS - Finding a complex object in an array
Facebook Login Dialog does not work on iOS6 simulator
SKPaymentTransactionObserver not getting a callback on app switch
Core Data returns NSManagedObject instead of Concrete class, but only when using . accessor
Recognize if user has defined a native facebook account in iOS 6 settings
How to restore a Consumable In app Purchases?
Get thread specific info in iOS crash report?
How can I locally detect iPhone clock advancement by a user between app runs?