我如何从字符串变量使用Swift删除最后一个字符?在文档中找不到。
下面是完整的例子:
var expression = "45+22"
expression = expression.substringToIndex(countElements(expression) - 1)
当前回答
var str = "Hello, playground"
extension String {
var stringByDeletingLastCharacter: String {
return dropLast(self)
}
}
println(str.stringByDeletingLastCharacter) // "Hello, playgroun"
其他回答
补充上述代码，我想删除字符串的开头，但在任何地方都找不到引用。以下是我的做法:
var mac = peripheral.identifier.description
let range = mac.startIndex..<mac.endIndex.advancedBy(-50)
mac.removeRange(range) // trim 17 characters from the beginning
let txPower = peripheral.advertisements.txPower?.description
这将从字符串的开头修剪17个字符(字符串的总长度是67，从末尾向前移动-50，就得到了它。
var str = "Hello, playground"
extension String {
var stringByDeletingLastCharacter: String {
return dropLast(self)
}
}
println(str.stringByDeletingLastCharacter) // "Hello, playgroun"
使用函数removeAtIndex(i: String.Index)
var s = "abc"
s.removeAtIndex(s.endIndex.predecessor()) // "ab"
斯威夫特4.2
我还删除了我的最后一个字符从字符串(即UILabel文本)在IOS应用程序
@IBOutlet weak var labelText: UILabel! // Do Connection with UILabel
@IBAction func whenXButtonPress(_ sender: UIButton) { // Do Connection With X Button
labelText.text = String((labelText.text?.dropLast())!) // Delete the last caracter and assign it
}
Swift 3:当你想删除尾随字符串:
func replaceSuffix(_ suffix: String, replacement: String) -> String {
if hasSuffix(suffix) {
let sufsize = suffix.count < count ? -suffix.count : 0
let toIndex = index(endIndex, offsetBy: sufsize)
return substring(to: toIndex) + replacement
}
else
{
return self
}
}
