Swift NSScanner 不 return 开始字符
Swift NSScanner doesn't return start character
我正在扫描 SVG 路径字符串,并使用 NSScanner 尝试将其分解为组件。当它运行时,虽然我得到了组件,但我没有取回 "type"
例如:"m 186.14021,456.15955 3.19716,8.75681 c 1.78393"
应该return:"m 186.14021,456.15955 3.19716,8.75681"
实际结果:“186.14021,456.15955 3.19716,8.75681”
知道我的代码哪里出了问题吗?
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)
}
好的,这似乎有效:
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)
}
我正在扫描 SVG 路径字符串,并使用 NSScanner 尝试将其分解为组件。当它运行时,虽然我得到了组件,但我没有取回 "type"
例如:"m 186.14021,456.15955 3.19716,8.75681 c 1.78393"
应该return:"m 186.14021,456.15955 3.19716,8.75681"
实际结果:“186.14021,456.15955 3.19716,8.75681”
知道我的代码哪里出了问题吗?
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)
}
好的,这似乎有效:
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)
}