let index1 = arc4random_uniform(10);
let x = array[index1];
The second line is giving following error
could not find an overload for 'subscript' that accepts the supplied argumentslet x = array[index1]; ^~~~~~~~~~~~~
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Pass the int value by type casting itKumar KL– Kumar KL2014-06-13 06:38:49 +00:00Commented Jun 13, 2014 at 6:38
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Can you give an example?MobileMe– MobileMe2014-06-13 06:41:20 +00:00Commented Jun 13, 2014 at 6:41
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1 Answer
you have to convert the index to Int like e.g. this:
let index1: UInt32 = arc4random_uniform(10); // with the type of the value
let x = array[Int(index1)];
the Int is the proper index type rather than UInt32.
UPDATE
if you are not quiet happy to convert the index every individual time, you can also add an extension to Array with defining a new subscript for your generic index type(s), e.g. such extension would look with UInt32 like this:
extension Array {
subscript (index: UInt32) -> T {
get {
let intIndex : Int = Int(index)
return self[intIndex]
}
}
}
NOTE: I have not worked out the setter here.
4 Comments
MobileMe
Thanks holex -- just started swift today and didn't know how to typecast. I was trying (Int)index1 and it obviously was not fixing it :-)
jrturton
This isn't typecasting. You're initialising a new
Int with the UInt32 value. It's the right answer, with a slightly misleading explanation
holex
yes, that is true, unfortunately the pure casting like
index1 as Int is just not working in that case, I re-phrased and also have extended my answer.
Martin R
The type annotation for
index1 is not necessary, just let index1 = arc4random_uniform(10) works as well.