Calling Objective C methods that has variable args

[Hwee-Boon Yar]

What's the proper way to call Objective C methods that has variable args?

E.g. NSString.stringWithFormat

a = ["hello %@", "world"]

NSString.stringWithFormat(a) #crash

NSString.stringWithFormat(*a) #crash

NSString.send('stringWithFormat:', *a) #crash

I've read: https://groups.google.com/forum/?fromgroups=#!searchin/rubymotion/variable$20args/rubymotion/1eqGub_Dn4c/GVMBx4NJWgsJ

Thanks.

—

Hwee-Boon

[ecamacho]

Hi,

In those cases you can past the args separated by a comma:

puts NSString.stringWithFormat("hello %@", "world")

That should work

Erick

[Hwee-Boon Yar]

Forgot to mention I tried this and it crashed too:

NSString.stringWithFormat("hello %@", "world")

:)

Also not sure if something similar would work with methods that has variadic args in between arguments such as UIActionSheet#initWithTitle:delegate:cancelButtonTitle:destructiveButtonTitle:otherButtonTitles:

—

Hwee-Boon

http://hboon.com

[Joffrey Jaffeux]

Hi,

We are currently investigating issues about this : http://hipbyte.myjetbrains.com/youtrack/issue/RM-80

[Matt Green]

I never had luck with this, I ran into it using NSPredicate. Settled on using an overload that took an array, rather than varargs.

[Hwee-Boon Yar]

Thanks Matt.

Joffrey:

Not all ObjC variadic methods has an equivalent that accepts NSArray* though. It'll be a showstopper for some cases. In my case, I'm looking at UIAppearance.appearanceWhenContainedIn: which doesn't have a documented NSArray* equivalent.

—

Hwee-Boon

[Ignacio Piantanida]

Have you found any workaround?

--
Piantanida, Ignacio Julián

2013/3/31 Hwee-Boon Yar <hwee...@gmail.com>

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[Hwee-Boon Yar]

Haven't had the chance to work on this yet. But a bunch of extension methods in ObjC should go the job.

—
Hwee-Boon
http://hboon.com

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[Hwee-Boon Yar]

In the meantime, till this limitation is fixed, I've added https://github.com/hboon/MOShine which adds UINavigationBar.moAppearanceWhenContainedIn(), taking in a list of classes.

It lets me do:

UINavigationBar.moAppearanceWhenContainedIn([UIImagePickerController]).setBackgroundImage(nil, forBarMetrics:UIBarMetricsDefault)

A similar approach should work for other method/functions with only variadic-args versions.

—

Hwee-Boon

--
Piantanida, Ignacio Julián

2013/3/31 Hwee-Boon Yar <hwee...@gmail.com>

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