I'd also like to add that there's no need to learn any Objective-c in order to learn Swift.
You could do a quick, short course such as BitFountain's http://bitfountain.io/course/mini-iOS8/.
I did the full iOS 8 with Swift course when it was on sale a couple of months ago, but it's back up to its $499 price.
https://stacksocial.com/sales/the-complete-ios-8-developers-...