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Swift – all that glitters is not gold (casting to CFString)

29 lipca, 2014 przez dubinski

Yes, it was love at first sight, but recently Swift annoys me more and more with every day that passes. Today I spent a few hours in an attempt to run a method which converts the string to the machine url (percent instead of space etc). Knowing that String requires double casting to CFString I finished with something like this:

[code language=”objc”]
let baseUrl = "http://example.com"
let nsBaseUrl:NSString = baseUrl as NSString
let cfBaseUrl:CFString = nsBaseUrl as CFString

let chars = "!*'();:@&=+$,/?%#[]"
let nsChars:NSString = chars as NSString
let cfChars:CFString = nsChars as CFString

var encodedCfStringRef = CFURLCreateStringByAddingPercentEscapes(
kCFAllocatorDefault,
cfBaseUrl,
nil,
cfChars,
CFStringEncoding(UTF8)
)
[/code]

Unfortunately, the stubborn Xcode constantly tells me that the strings I provide are NSStrings, not CFStrings.

I am not the only one who struggles with same problem:

@cmlenz Looks like I am not the only one.

— Kali Berek (@kaliberek) lipiec 29, 2014

Unfortunately, Swift still needs a little polishing. I will keep you posted on the progress of my fight with this problem.

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