是否斯威夫特有一个修剪方法的字符串?例如:
let result = " abc ".trim()
// result == "abc"
当前回答
把这段代码放在你项目的一个文件中，比如Utils.swift:
extension String {
func trim() -> String {
return self.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceCharacterSet())
}
}
所以你可以这样做:
let result = " abc ".trim()
// result == "abc"
Swift 3.0解决方案
extension String {
func trim() -> String {
return self.trimmingCharacters(in: NSCharacterSet.whitespaces)
}
}
所以你可以这样做:
let result = " Hello World ".trim()
// result = "HelloWorld"
其他回答
**Swift 5**
extension String {
func trimAllSpace() -> String {
return components(separatedBy: .whitespacesAndNewlines).joined()
}
func trimSpace() -> String {
return self.trimmingCharacters(in: .whitespacesAndNewlines)
}
}
**Use:**
let result = " abc ".trimAllSpace()
// result == "abc"
let ex = " abc cd ".trimSpace()
// ex == "abc cd"
下面介绍如何从字符串的开头和结尾删除所有空白。
(用Swift 2.0测试的示例。)
let myString = " \t\t Let's trim all the whitespace \n \t \n "
let trimmedString = myString.stringByTrimmingCharactersInSet(
NSCharacterSet.whitespaceAndNewlineCharacterSet()
)
// Returns "Let's trim all the whitespace"
(用Swift 3+测试的示例。)
let myString = " \t\t Let's trim all the whitespace \n \t \n "
let trimmedString = myString.trimmingCharacters(in: .whitespacesAndNewlines)
// Returns "Let's trim all the whitespace"
你可以在我写的Swift String扩展https://bit.ly/JString中使用trim()方法。
var string = "hello "
var trimmed = string.trim()
println(trimmed)// "hello"
把这段代码放在你项目的一个文件中，比如Utils.swift:
extension String {
func trim() -> String {
return self.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceCharacterSet())
}
}
所以你可以这样做:
let result = " abc ".trim()
// result == "abc"
Swift 3.0解决方案
extension String {
func trim() -> String {
return self.trimmingCharacters(in: NSCharacterSet.whitespaces)
}
}
所以你可以这样做:
let result = " Hello World ".trim()
// result = "HelloWorld"
extension String {
/// EZSE: Trims white space and new line characters
public mutating func trim() {
self = self.trimmed()
}
/// EZSE: Trims white space and new line characters, returns a new string
public func trimmed() -> String {
return self.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet())
}
}
从我的这个回购:https://github.com/goktugyil/EZSwiftExtensions/commit/609fce34a41f98733f97dfd7b4c23b5d16416206
