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
在Swift3 XCode 8 Final中
注意CharacterSet。空格不再是函数了!
(NSCharacterSet.whitespaces也不是)
extension String {
func trim() -> String {
return self.trimmingCharacters(in: CharacterSet.whitespaces)
}
}
其他回答
不要忘记导入Foundation或UIKit。
import Foundation
let trimmedString = " aaa "".trimmingCharacters(in: .whitespaces)
print(trimmedString)
结果:
"aaa"
否则你会得到:
error: value of type 'String' has no member 'trimmingCharacters'
return self.trimmingCharacters(in: .whitespaces)
//Swift 4.0删除空格和新行
extension String {
func trim() -> String {
return self.trimmingCharacters(in: .whitespacesAndNewlines)
}
}
您还可以发送您想要修剪的字符
extension String {
func trim() -> String {
return self.trimmingCharacters(in: .whitespacesAndNewlines)
}
func trim(characterSet:CharacterSet) -> String {
return self.trimmingCharacters(in: characterSet)
}
}
validationMessage = validationMessage.trim(characterSet: CharacterSet(charactersIn: ","))
Swift 5和4.2
let trimmedString = " abc ".trimmingCharacters(in: .whitespaces)
//trimmedString == "abc"
斯威夫特3
let result = " abc ".trimmingCharacters(in: .whitespacesAndNewlines)
