Re: Obj-c to Swift conversion question
Re: Obj-c to Swift conversion question
- Subject: Re: Obj-c to Swift conversion question
- From: Jean-Daniel Dupas <email@hidden>
- Date: Tue, 28 Jul 2015 17:34:57 +0200
> Le 28 juil. 2015 à 16:03, Eric E. Dolecki <email@hidden> a écrit :
>
> The more I stretch to Swift goals, the more I learn. However I've come upon
> a little thing where I am translating code into Swift and quickly stumbled.
>
> *Obj-C:*
> NSValue *keyboardEndFrameValue = [[notification userInfo]
> objectForKey:UIKeyboardFrameEndUserInfoKey];
>
>
> *Swift (the closest I've come):*
> var keyboardEndFrameValue =
> NSValue(notification.userInfo[UIKeyboardFrameEndUserInfoKey])
>
NSValue() is not a cast, it is a constructor.
Should be something like
var keyboardEndFrameValue = notification.userInfo[UIKeyboardFrameEndUserInfoKey] as NSValue
> Error for Swift: insert nonretainedObject:
> When I "Fix-It" with the above suggestion, the error becomes "Cannot
> subscript a value of type '[NSObject: AnyObject]?' with an index of type
> 'String'
>
> So I then end up with this (but it looks really strange):
>
> var keyboardEndFrameValue = NSValue(nonretainedObject:
> notification.userInfo[UIKeyboardFrameEndUserInfoKey as String])
>
> No warnings or errors, but I wanted to check to see if I'm appeasing the
> compiler but have it wrong.
>
> Thanks,
> Eric
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