Swift style initializers

[Doug]

Hey.

So this isn’t particularly robust, but I’ve been tinkering and was wondering whether something similar to this could actually be included within a gem or maybe RubyMotion itself?

https://gist.github.com/digitalfx/5a635b6070faccb1cdf8

This means that

label = UILabel.alloc.initWithFrame([[50, 100], [100, 30]])
color = UIColor.alloc.initWithRed(0.5, green: 0.5, blue: 0.5, alpha: 0.9)

becomes

label = UILabel.new(frame: [[50, 100], [100, 30]])
color = UIColor.new(red:0.5, green: 0.5, blue: 0.5, alpha: 0.9)

Cheers

[Eric Henderson]

Cool idea.  I just added a suggestion to the gist.

Eric Henderson

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[Doug]

Thanks. I’ve updated the gist following yours and Colin’s comments, and renamed the method to self.with. This means the examples above become

label = UILabel.with(frame: [[50, 100], [100, 30]])
color = UIColor.with(red:0.5, green: 0.5, blue: 0.5, alpha: 0.9)

This actually reads fairly well to me. Although the less ruby style nature of it might defeat the point of making such a helper.

Cheers

Doug

[Colin T.A. Gray]

Good idea! Avoiding 'new' in this case is a good idea. And you get a gem name for free! 😉

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[Doug]

Ok, so before jumping straight to a gem, the next problem is that a method such as

UIColor.with(red: 0.5, green: 0.5, blue: 0.5, alpha: 0.9)

calls

UIColor.alloc.send('initWithRed:green:blue:alpha:’, *[0.5, 0.5, 0.5, 0.9])

And presents the error

Objective-C stub for message `initWithRed:green:blue:alpha:' type `@@:dddd' not precompiled. Make sure you properly link with the framework or library that defines this message.

It works absolutely fine calling the method from the repl, but from compiled code (e.g. my app delegate or view controller), it always errors. A single argument works fine such as the call

label = UILabel.alloc.initWithFrame([[50, 100], [100, 30]])

Which leads me to think that using splat in the send method isn’t working properly in the runtime? Would that make sense?

[Doug]

That working example should be

label = UILabel.new(frame: [[50, 100], [100, 30]])

I can’t seem to edit posts on here? Is that normal?

[Jamon Holmgren]

Yes -- you'll need to provide that method somewhere in your source so RubyMotion can precompile it. Even just a dummy class usually works.

class DummyStubs
  def initWithRed(_, green: _, blue: _, alpha: _)
    abort "Don't call this, it's just for RM"
  end
end

- Jamon

[Doug]

Ah, thanks Jamon! That explains an awful lot. I’ll have another look into this then.

Doug

[Jamon Holmgren]

I'd be interested to check out the gem when it's ready, for sure!

Jamon

[Doug]

So there’s still some issues with it, but here you go, my first Gem!

https://github.com/digitalfx/WithMotion

Doug

[Jamon Holmgren]

Nice work!

Jamon Holmgren

Owner, ClearSight, LLC
Office: 360.450.2922 | Cell/Text: 360.609.4328

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[Nicholas Pachulski]

sweet, thanks

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[Doug]

Cheers, I’ve just had an awesome pull request that does away with Stubs generation by calling the methods through NSInvocation. So now, as far as I can see, this works really well including nesting a .with inside a .with method!