我正在寻找一种方法来取代字符在一个Swift字符串。
示例:“This is my string”
我想用“+”替换“”以获得“This+is+my+string”。
我怎样才能做到这一点呢?
我正在寻找一种方法来取代字符在一个Swift字符串。
示例:“This is my string”
我想用“+”替换“”以获得“This+is+my+string”。
我怎样才能做到这一点呢?
当前回答
斯威夫特5.5
但这在早期版本中可能有效。
我经常替换,因为我想用_或类似的东西替换“任何空白或-”。这个对字符串的扩展让我做到了。
extension String {
func removingCharacters(_ characters:CharacterSet) -> Self {
Self(self.unicodeScalars.filter {
!characters.contains($0)
})
}
func removingCharacters(in string:String) -> Self {
Self(self.unicodeScalars.filter {
!CharacterSet(charactersIn:string).contains($0)
})
}
func replacingCharacters(_ characters:CharacterSet, with newChar:Character) -> Self {
String(self.compactMap( {
CharacterSet(charactersIn: "\($0.1)").isSubset(of: characters)
? newChar : $0.1
}))
}
func replacingCharacters(in string:String, with newChar:Character) -> Self {
String(self.compactMap( {
CharacterSet(charactersIn: "\($0)").isSubset(of: CharacterSet(charactersIn:string))
? newChar : $0
}))
}
}
用法:
print("hello \n my name\t is Joe".removingCharacters(.whitespacesAndNewlines))
print("hello \n my name\t is Joe".removingCharacters(in: " \t\n"))
print("ban annan anann ana".replacingCharacters(.whitespacesAndNewlines, with: "_"))
print("ban-annan anann ana".replacingCharacters(in: " -", with: "_"))
显然,对于单个字符,. replacingoccurrences (of: " ", with: "+")更好。
我没有做过性能比较
let toArray = aString.components(separatedBy: characterSet)
let backToString = toArray.joined(separator: "+")
风格做在Ramis的扩展。如果有人愿意,我会很感兴趣的。
参见替换表情符号:https://stackoverflow.com/a/63416058/5946596
其他回答
你测试过这个吗?
var test = "This is my string"
let replaced = test.stringByReplacingOccurrencesOfString(" ", withString: "+", options: nil, range: nil)
Swift 4和5已经更新了这个答案。如果你还在使用Swift 1、2或3,请查看修订历史。
你有两个选择。你可以像@jaumard建议的那样,使用replacingOccurrences()
let aString = "This is my string"
let newString = aString.replacingOccurrences(of: " ", with: "+", options: .literal, range: nil)
正如下面@cprcrack所指出的,选项和范围参数是可选的,所以如果您不想指定字符串比较选项或执行替换的范围,您只需要以下内容。
let aString = "This is my string"
let newString = aString.replacingOccurrences(of: " ", with: "+")
或者,如果数据是这样的特定格式,其中只是替换分隔符,则可以使用components()将字符串拆分为一个数组,然后可以使用join()函数将它们与指定的分隔符组合在一起。
let toArray = aString.components(separatedBy: " ")
let backToString = toArray.joined(separator: "+")
或者如果你正在寻找一个更Swifty的解决方案,不利用NSString的API,你可以使用这个。
let aString = "Some search text"
let replaced = String(aString.map {
$0 == " " ? "+" : $0
})
var str = "This is my string"
print(str.replacingOccurrences(of: " ", with: "+"))
输出是
This+is+my+string
很少发生在我身上,我只是想改变字符串中的(一个单词或字符)
所以我用了字典
extension String{
func replace(_ dictionary: [String: String]) -> String{
var result = String()
var i = -1
for (of , with): (String, String)in dictionary{
i += 1
if i<1{
result = self.replacingOccurrences(of: of, with: with)
}else{
result = result.replacingOccurrences(of: of, with: with)
}
}
return result
}
}
使用
let mobile = "+1 (800) 444-9999"
let dictionary = ["+": "00", " ": "", "(": "", ")": "", "-": ""]
let mobileResult = mobile.replace(dictionary)
print(mobileResult) // 001800444999
你可以用这个:
let s = "This is my string"
let modified = s.replace(" ", withString:"+")
如果你在你的代码中添加这个扩展方法:
extension String
{
func replace(target: String, withString: String) -> String
{
return self.stringByReplacingOccurrencesOfString(target, withString: withString, options: NSStringCompareOptions.LiteralSearch, range: nil)
}
}
斯威夫特3:
extension String
{
func replace(target: String, withString: String) -> String
{
return self.replacingOccurrences(of: target, with: withString, options: NSString.CompareOptions.literal, range: nil)
}
}