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
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
}
}
其他回答
let str = "abc"
let substr = str.substringToIndex(str.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
}
函数的作用是:删除字符串的最后一个元素。
var expression = "45+22"
expression = expression.dropLast()
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
}
}
使用函数removeAtIndex(i: String.Index)
var s = "abc"
s.removeAtIndex(s.endIndex.predecessor()) // "ab"
