Questions tagged [optional-variables]
36 questions
0
votes
2 answers
Swift: Why all my optional variable looks like "Optional(305.502)"
I've just start learning swift. And I am a little be confused with optional types. I have some variable var theOptVar: Float? it can be nil so I make it optional with ?.
But when I'd like to get it somewhere at UI I see Optional(305.502).
Is there…
user3742622
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2 answers
How to unwrap NSMutableDictionary.allkeys in optional String Array
I am trying to get all the key values of NSMutableDictionary as String Array. I am using this myNSMutableDictionary.allkeys to get the values as an Array but I cannot find a way to unwrap the key values.
This is what I have tried so far:
for (key,…
Tal Zion
- 6,308
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0
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0 answers
Swift: how to check responds to and assign var declared in protocol as optional
protocol declaration:
@objc protocol LeftSideMenuViewControllerProtocol {
var containerShouldPerformContentSegueWithIdentifier:((segueIdentifier: String, object: AnyObject!) -> Void)! {set get}
optional var…
iiFreeman
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2 answers
Working with optionals in Swift programming language
As far as I know the recommended way to use optionals (Int in this example) is the following:
var one:Int?
if var maybe = one {
println(maybe)
}
Is it possible to use a shorter way to do something like the following?
var one:Int?
var…
Linus
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1 answer
Uwrapping optionals - Swift 1.2 Xcode 6.4
I still got problems with optionals, examples made by Apple are not clear to me. I understood that:
1 - optional is a Type of data, so Int? or String? are optionals, not Int or String
2 - optional can be a variable, not a constant, that as far as…
biggreentree
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votes
4 answers
Swift optional downcasting as Any
If we are trying access optional object property can we do like this -
var obj: Person
var str = obj.name? as Any
is this the right way to handle a nil case in swift3?
srus2017
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