Swift error while downcasting 'Any'...

Optionally adding items to a Scala Map...

How to select random values from the list?...

Swift: Can weak reference be deallocated during optional binding?...

Regex: Match optional string to group...

Cannot convert return expression of type 'User' to return type 'User?' for getting c...

Scala - Sort by Optional fields, with None value last...

What's the difference between testing an optional for "nil" and ".None"?...

Unexpectedly found nil while unwrapping an Optional value when passing data backward...

Array declared for collectionview null value optional...

Unwrapping an optional in Swift 4...

Is it necessary to set variable 'possibleIntegerValue' to 'optional Int(Int?)' or it...

How to make a optional group, but if the group exists most match with my regex?...

Swift: array check for object at index...

Swift Direction Request does not calculate in if statement correctly...

Swift viewcontroller declaration returning nil...

Converting from one nullable type to another nullable type...

Difference between optional values in swift?...

MailComposeViewController Error: unexpectedly found nil...

Swift Optional Value in variable...

Realm object with NSData variable , unexpectedly found nil while unwrapping an Optional value...

Swift 2.0 fatal error: unexpectedly found nil while unwrapping an Optional value (lldb)...

unexpectedly found nil while unwrapping an Optional value dispatch-async...

simple image data passing from collection view to view controller fail...

Problems checking to see if a value exists in Swift 2...

Why does Swift 2 favor forced unwrap over optionals?...

change collection optional value in swift?...

can't remove optional() from string after updating to latest xcode?...

Double exclamation !! mark in Swift?...

Found nil while unwrapping an Optional value, Error...