Try this,
var check:String?="optional String"
print(check!) //optional string. This will result in nil while unwrapping an optional value if value is not initialized or if initialized to nil.
print(check) //Optional("optional string") //nil values are handled in this statement
Go with first if you are confident to have no nil in your variable. Also, you can use if let or Guard let statement to unwrap optionals without any crash.
if let unwrapperStr = check
{
print(unwrapperStr) //optional String
}
Guard let,
guard let gUnwrap = check else
{
//handle failed unwrap case here
}
print(gUnwrap) //optional String