Ask HN: How should I get start developing mac app without learning Obj-c

I have rich experience in Web development skill and now I want to learn writing (pure) mac app. Instead of learning Obj-c, I prefer learning swift. But what confuse me is, there is a little place or tutorial for learning Cocoa Framework without Obj-c skill.

It is possible that I don't learn Obj-c but I can still write mac app well using Swift?