Re: Swift: How to determine if a Character represents whitespace?
Re: Swift: How to determine if a Character represents whitespace?
- Subject: Re: Swift: How to determine if a Character represents whitespace?
- From: Quincey Morris <email@hidden>
- Date: Fri, 03 Apr 2015 02:47:19 +0000
On Apr 2, 2015, at 19:28 , Charles Jenkins <email@hidden> wrote:
>
> So after doing two anchored searches, one at the beginning and one at the end of the string, if I get two different ranges, I’m stuck with two values that aren’t subtractable to determine the length of the NSRange I need in a call to attributedSubstringFromRange().
Not at all. All of this API is *NSString* API, even if the instance happens to be String instead of NSString, so the ranges are NSString-compatible ranges (i.e. UTF16 code value ranges), so you can just do the subtraction and use the result in attributedSubstringFromRange.
> I think the safest thing for me to do for attributed string compatibility is give up on Swift purity and put my range-trimming function in an Objective-C file.
Again, it’s all NSString API, so the results are what the Obj-C API would return. Otherwise, interoperability wouldn’t work.
If, additionally, you cast any String-returning result ‘as’ NSString, then you literally are doing Obj-C, though it happens to be created by the Swift compiler. That is to say, it’s going to make Obj-C-style method calls with an Obj-C-NSString-style object as receiver, so the source language is irrelevant. (!)
That, or I’ve run wildly off the rails.
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