Swift NSScanner不返回起始字符

-1

我正在掃描SVG路徑字符串，並使用NSScanner嘗試將其分解爲它的組件。當它運行，雖然我得到的成分，但我沒有收到回「型」Swift NSScanner不返回起始字符

例如：「M 186.14021,456.15955 3.19716,8.75681ç1.78393」

應返回：「米186.14021,456.15955 3.19716,8.75681"

實際結果：「186.14021,456.15955 3.19716,8.75681」

任何想法在我的代碼是行不通了？

import UIKit 

let whitespaceAndPunctuationSet = NSMutableCharacterSet.whitespaceAndNewlineCharacterSet() 
whitespaceAndPunctuationSet.formUnionWithCharacterSet(NSCharacterSet.punctuationCharacterSet()) 


var str = "m 186.14021,456.15955 3.19716,8.75681 c 1.78393,0.93528 30.33822,25.2032 27.48643,47.35972 -4.11654,31.98273 -39.24645,39.28157 -59.94003,28.99354 -20.69358,-10.28804 -17.12572,-56.58417 -14.98501,-58.45472 2.14072,-1.87055 24.97501,-80.4337 44.24145,-26.65535 z" 
let characterSet = NSCharacterSet(charactersInString: "mlhvcsqtaz") 
let aScanner = NSScanner(string: str) 
aScanner.charactersToBeSkipped = whitespaceAndPunctuationSet 

while aScanner.atEnd == false 
{ 
    var testString:NSString? 

    aScanner.scanUpToCharactersFromSet(characterSet, intoString: &testString) 

    aScanner.scanCharactersFromSet(characterSet, intoString: nil) 

    print(testString) 
}

來源

2015-09-19 Chris

您在其他問題，不是嗎？ NSScanner可以將123-456轉換爲123和-456嗎？ –

爲什麼你不使用現有的解析器？無論如何，你爲什麼不先使用'scanCharactersFromSet'來獲取控件字符，然後使用'scanUpToCharactersFromSet'來獲取點 – Wain

好吧，這似乎工作：

import UIKit 

let whitespaceAndPunctuationSet = NSMutableCharacterSet.whitespaceAndNewlineCharacterSet() 
whitespaceAndPunctuationSet.formUnionWithCharacterSet(NSCharacterSet.punctuationCharacterSet()) 


var str = "m 186.14021,456.15955 3.19716,8.75681 c 1.78393,0.93528 30.33822,25.2032 27.48643,47.35972 -4.11654,31.98273 -39.24645,39.28157 -59.94003,28.99354 -20.69358,-10.28804 -17.12572,-56.58417 -14.98501,-58.45472 2.14072,-1.87055 24.97501,-80.4337 44.24145,-26.65535 z" 
let characterSet = NSCharacterSet(charactersInString: "mlhvcsqtaz") 
let aScanner = NSScanner(string: str) 
aScanner.charactersToBeSkipped = whitespaceAndPunctuationSet 

while aScanner.atEnd == false 
{ 
    var testString:NSString? 
    var controlChar:NSString? 

    aScanner.scanCharactersFromSet(characterSet, intoString: &controlChar) 

    aScanner.scanUpToCharactersFromSet(characterSet, intoString: &testString) 

    print(controlChar) 
    print(testString) 
}

來源

2015-09-19 20:00:31 Chris

Swift NSScanner不返回起始字符

回答

相關問題