ios Swift 替换字符串中的多个字符
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Swift Replace Multiple Characters in String
提问by Jeff Richard
Below is the following line of code I use to replace an HTML break tag with a carriage return. However, I have other HTML symbols that I need to replace and when I call this line of code again, with different parameters, it's as if the first one is overwritten. Is there a way I can include multiple parameters? Is there a more efficient way to do this in Swift? For example: replace both br> with "" and nbsp with "".
下面是我用来用回车替换 HTML 中断标记的以下代码行。但是，我还有其他 HTML 符号需要替换，当我再次调用这行代码时，使用不同的参数，就好像第一个被覆盖了一样。有没有办法可以包含多个参数？在 Swift 中是否有更有效的方法来做到这一点？例如：将 br> 替换为“”，将 nbsp 替换为“”。
textView.text = content.stringByReplacingOccurrencesOfString("<br /><br />", withString:"\r")
回答by Michael Peterson
Use replacingOccurrencesalong with a the String.CompareOptions.regularExpresionoption.
使用replacingOccurrences用了一起String.CompareOptions.regularExpresion选项。
Example (Swift 3):
示例（Swift 3）：
var x = "<Hello, [play^ground+]>"
let y = x.replacingOccurrences(of: "[\[\]^+<>]", with: "7", options: .regularExpression, range: nil)
print(y)
Input characters which are to be replaced inside the square brackets like so [\\ Characters]
输入要在方括号内替换的字符，如下所示 [\\ Characters]
Output:
输出：
7Hello, 7play7ground777
回答by skofgar
I solved it based on the idea of Rosetta Code
我是根据Rosetta Code的思路解决的
extension String {
func stringByRemovingAll(characters: [Character]) -> String {
return String(self.characters.filter({ !characters.contains(let str = "Hello, stackoverflow"
let chars: [Character] = ["a", "e", "i"]
let myStrings = ["Hello", ", ", "overflow"]
let newString = str.stringByRemovingAll(chars)
let anotherString = str.stringByRemovingAll(myStrings)
) }))
}
func stringByRemovingAll(subStrings: [String]) -> String {
var resultString = self
subStrings.map { resultString = resultString.stringByReplacingOccurrencesOfString(let result1 = content.stringByReplacingOccurrencesOfString("<br /><br />", withString:"\r")
let result2 = result1.stringByReplacingOccurrencesOfString(" ", withString:" ")
textView.text = result2
, withString: "") }
return resultString
}
}
Example:
例子：
extension String {
var html2AttributedString:NSAttributedString {
return NSAttributedString(data: dataUsingEncoding(NSUTF8StringEncoding)!, options:[NSDocumentTypeDocumentAttribute:NSHTMLTextDocumentType, NSCharacterEncodingDocumentAttribute: NSUTF8StringEncoding], documentAttributes: nil, error: nil)!
}
}
let myHtmlCode = "<style type=\"text/css\">#red{color:#F00}#green{color:#0F0}#blue{color: #00F}</style><span id=\"red\" >Red</span> <span id=\"green\" >Green</span><span id=\"blue\">Blue</span>"
myHtmlCode.html2AttributedString
Result, when printed:
结果，打印时：
newString: Hllo, stckovrflow
新字符串： Hllo, stckovrflow
anotherString: stack
另一个字符串： stack
回答by Jawwad
As @matt mentioned you are starting over with the same contentstring. The stringByReplacingOccurrencesOfString method doesn't actually change anything in the original contentstring. It returns to you a new string with the replacement changes while contentremains unchanged.
正如@matt 提到的，您将使用相同的content字符串重新开始。stringByReplacingOccurrencesOfString 方法实际上不会更改原始content字符串中的任何内容。它返回给您一个新字符串，替换更改后content保持不变。
Something like this should work for you
像这样的东西应该适合你
##代码##