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
Xcode 11•Swift 5.1
StringProtocol replacingOccurrences的突变方法可以实现如下:
extension RangeReplaceableCollection where Self: StringProtocol {
mutating func replaceOccurrences<Target: StringProtocol, Replacement: StringProtocol>(of target: Target, with replacement: Replacement, options: String.CompareOptions = [], range searchRange: Range<String.Index>? = nil) {
self = .init(replacingOccurrences(of: target, with: replacement, options: options, range: searchRange))
}
}
var name = "This is my string"
name.replaceOccurrences(of: " ", with: "+")
print(name) // "This+is+my+string\n"
其他回答
迅速扩展:
extension String {
func stringByReplacing(replaceStrings set: [String], with: String) -> String {
var stringObject = self
for string in set {
stringObject = self.stringByReplacingOccurrencesOfString(string, withString: with)
}
return stringObject
}
}
继续使用let replacedString = yorString。stringbyreplacement (replaceStrings: [" ","?","."],加上:“+”)
函数的速度是我几乎不能感到骄傲的,但是你可以在一次传递一个String数组来进行多次替换。
这在swift 4.2中很容易做到。只需使用replacingOccurrences(of: " ", with: "_")进行替换
var myStr = "This is my string"
let replaced = myStr.replacingOccurrences(of: " ", with: "_")
print(replaced)
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
})
你测试过这个吗?
var test = "This is my string"
let replaced = test.stringByReplacingOccurrencesOfString(" ", withString: "+", options: nil, range: nil)
Swift 3, Swift 4, Swift 5解决方案
let exampleString = "Example string"
//Solution suggested above in Swift 3.0
let stringToArray = exampleString.components(separatedBy: " ")
let stringFromArray = stringToArray.joined(separator: "+")
//Swiftiest solution
let swiftyString = exampleString.replacingOccurrences(of: " ", with: "+")