Swift Mutable Array in C

Question

I am trying to access a property of a Swift class using pure C code, since I'm in the Audio Thread.

The property is declared so:

var Triggers: [[Int]] = [[Int]]()

C sees this as a NSArray (non mutable) hence I can't modify its elements. Declaring the property as a NSMutableArray is also not helping.

What would be the correct approach?

Thanks.

ksh · Accepted Answer · 2016-02-03 07:57:59Z

1

If you only have to pass your array to C function then the easiest way is to pass pointer argument using the & operator like so

your_c_func(arg1, arg2, &Triggers);

If you have to do something more advanced then you will have to play with UnsafeBufferPointers and it's friends.

Here's some links to get you started on this:

Apple's Swift blog

Unsafe Swift by Russ Bishop

answered Feb 3, 2016 at 7:57

ksh

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Comments

Marcus Rossel · Accepted Answer · 2016-02-02 16:54:34Z

0

I will say, that I have little experience with Objective-C Interop. But personally I would assign the contents of the immutable array to an NSMutableArray, and then perform modifications on the copy - if needed of course.

answered Feb 2, 2016 at 16:54

Marcus Rossel

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1 Comment

aguycalledalex Over a year ago

I'd need to modify the object's property. I won't be able to put the NSMutableArray back in the object

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