Swift native types vs. ObjC native types about swift-style-guide HOT 6 CLOSED

Our policy will be to prefer Swift's built-in types. In some cases, the functionality is not identical so there may be cases where one is preferred over the other, but in general, default to Swift types.

--------- Original Message --------- Subject: [swift-style-guide] Swift native types vs. ObjC native types (#15)
From: "Soheil Moayedi Azarpour" [email protected]
Date: 6/10/14 9:59 pm
To: "raywenderlich/swift-style-guide" [email protected]

Is there any preference to use native Swift type vs. ObjC type?
Not sure if there are any side effects or benefits, so I thought I would pose this as a new issue.
For example both of the following declarations are valid:
@objc class LoggedDate { let date: NSDate let formattedDateAsString: NSString init(date: NSDate, formattedDateAsString: NSString) { self.date = date self.formattedDateAsString = formattedDateAsString } } and
@objc class LoggedDate { let date: NSDate let formattedDateAsString: String init(date: NSDate, formattedDateAsString: String) { self.date = date self.formattedDateAsString = formattedDateAsString } } and formattedDateAsString can be assigned to an ObjC property that is NSString, e.g. cell.textLabel.text = loggedDate.formattedDateAsString in a Swift class.
We can extend this question to cover
Int vs. NSInteger or
Float vs. float and CGFloat, or
var arrayOfInt = [1, 2, 3] vs. var arrayOfInt = NSArray(objects: 1, 2, 3)

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We should favour Swift types. Regarding your specific example ...

• Swift does not have a date type (yet), so use NSDate for now.
• The Swift String type is bridged to the NSString type, as a result it has all teh same API methods and can be used interchangeably.

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+1 for always favor Swift types when available.

Its annoying at times when you have to do myFloatString.bridgeToObjectiveC().floatValue() because Swift's String type doesn't support it.

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I have a feeling this is a short term problem and we will see the 'native' Swift API grow. I bet we will see a Date type soon.

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Agreed ... At least data types should be more or less fixed in the next
betas

On Thursday, June 12, 2014, ColinEberhardt [email protected] wrote:

I have a feeling this is a short term problem and we will see the 'native'
Swift API grow. I bet we will see a Date type soon.

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#15 (comment)
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What about in Sprite Kit - CGFloat vs. Double? Prefer using Double except when you must convert to CGFloat?

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