问题:数字的长度不同,可能是 1、200、1000、39 99995 等。需要用文本替换,例如。与数值不同长度比较的“Apple”。
let str: String = "hello i have 1313 object of 10 string class with 1 object, similar to 9999 errors"
预期结果 = "你好我有 Apple 字符串类的 Apple 对象和 Apple 对象,类似于 Apple 错误”
我试过下面的代码:
var originalString: String = "hello i have 1313 object of 10 string class with 1 object, similar to 9999 errors"
let strippedString: NSMutableString = NSMutableString(capacity: originalString.characters.count)
var numArray: [String] = []
var locArray: [NSNumber] = []
var scanner: NSScanner = NSScanner(string:originalString)
let numbers: NSCharacterSet = NSCharacterSet(charactersInString: "0123456789")
while scanner.atEnd == false {
var buffer: NSString?
if scanner.scanCharactersFromSet(numbers, intoString: &buffer) {
strippedString.appendString(buffer! as String)
numArray.append(buffer! as String)
locArray.append(scanner.scanLocation)
}
else {
scanner.scanLocation = (scanner.scanLocation + 1)
}
}
for (index, _) in numArray.enumerate() {
var loc : Int = Int(locArray[index] ) - (String(numArray[index]).characters.count)
let len = String(numArray[index]).characters.count
let dupStr = "Apple"
if(index != 0 && len != dupStr.characters.count)
{
loc = loc + (dupStr.characters.count - len) + 1
}
originalString.replaceRange(originalString.startIndex.advancedBy(loc)..<originalString.startIndex.advancedBy(loc + len), with: dupStr)
}
print(originalString)
最佳答案
swift 2
NSScanner 很棒,但是如果您想要一个更简单的解决方案来完成此任务,您可以使用 componentsSeparatedByString
、map
、Int()
和joinWithSeparator
,像这样:
let originalString = "hello i have 1313 object of 10 string class with 1 object, similar to 9999 errors"
let tokens = originalString.componentsSeparatedByString(" ")
let newTokens = tokens.map { (token) -> String in
if let _ = Int(token) {
return "Apple"
}
return token
}
let result = newTokens.joinWithSeparator(" ")
print(result)
打印:
hello i have Apple object of Apple string class with Apple object, similar to Apple errors
还有一个简短的映射版本:
let newTokens = tokens.map { Int($0) != nil ? "Apple" : $0 }
swift 3
componentsSeparatedByString(_:)
现在是 components(separatedBy:)
,joinWithSeparator(_:)
现在是 joined(分隔符:)
.
let tokens = originalString.components(separatedBy: " ")
let newTokens = tokens.map { Int($0) != nil ? "Apple" : $0 }
let result = newTokens.joined(separator: " ")
关于ios - 用不同的文本长度替换字符串中不同长度的数字,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/37436587/