swift - NSScanner scanString: intoString: not working in playground -

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i'm trying make swift version of xml parser som weather data:

import cocoa import foundation  let string2: nsstring? = "cdefg jajaja <time> bbb"  let scanner = nsscanner(string: string2) scanner.string let searchstring:nsstring? = "<time" var result: nsstring?  = nil //= autoreleasingunsafepointer<nsstring?>  scanner.characterstobeskipped = nil scanner.scanstring(searchstring, intostring: nil) // not working (false)  scanner.scanuptostring( ">", intostring: &result) // working  result // result = "cdefg jajaja <time"

why "scanner.scanstring(searchstring, intostring: nil)" returning nil?

actually, problem has nothing swift (equivalent objective-c code same) – you're using nsscanner wrong. docs scanstring:intostring:

return value

yes if string matches characters @ scan location, otherwise no.

basically, scanstring:intostring: either finds searchstring @ current position (in example, @ start), or returns false. since string starts "cdefg" , not "<time", method returns false , not advance scanning position. if remove "cdefg jajaja " string, scanstring:intostring: call return true , advance scanning position next character ">". alternatively, change scanstring:intostring: call scanuptostring:intostring: discard before , including "<time".


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