当我用表情符号替代它时，它崩溃了。斯威夫特iOS
当我输入像hello@amit这样的简单字符串时，这段代码运行良好。但当我使用带有@df的表情符号时，它会引发崩溃。在子串中崩溃。当我通过简单文本中的子字符串获取文本时，它工作得很好，但使用表情符号会导致崩溃当我用表情符号替代它时，它崩溃了。斯威夫特iOS,ios,swift,Ios,Swift,当我输入像hello@amit这样的简单字符串时，这段代码运行良好。但当我使用带有@df的表情符号时，它会引发崩溃。在子串中崩溃。当我通过简单文本中的子字符串获取文本时，它工作得很好，但使用表情符号会导致崩溃 func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text:String) -> Bool { //var mentionStartPosition
func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text:String) -> Bool {
//var mentionStartPosition : Int = 0
//var isContainMention : Bool = false
//WHEN USER TYPE TEXT COMPLETE TEXT ADD NEW CHAR IN COMPLETETEXT
let completeText = textView.text + text
// CHECK char FOR IF USER PRESS BACKSPACE OR NOT
//ENNCODE THE CURRENT TEXT
if let char = text.cString(using: String.Encoding.utf8) {
//GET THE VALUE UNICODE
let isBackSpace = strcmp(char, "\\b")
//BACKSPACE PRESSED
if (isBackSpace == -92) {
if let selectedRange = textView.selectedTextRange {
let cursorPosition = textView.offset(from: textView.beginningOfDocument, to: selectedRange.end)
if mentionStartPosition < cursorPosition {
let textBetween = completeText.substring(Range(mentionStartPosition ... cursorPosition))
if textBetween.contains("@") {
isContainMention = true
} else {
isContainMention = false
}
} else {
isContainMention = false
}
}
}
}
if text.contains("@") {
isContainMention = true
searchText += text
return true
} else if isContainMention {
if let char = text.cString(using: String.Encoding.utf8) {
let isBackSpace = strcmp(char, "\\b")
if (isBackSpace == -92) {
if searchText.count > 0 {
searchText.removeLast()
if searchText.isEmpty {
isContainMention = false
searchText = ""
}
} else {
return true
}
}
}
if let selectedRange = textView.selectedTextRange {
let whitespace = NSCharacterSet.whitespaces
let range = text.rangeOfCharacter(from: whitespace, options: .regularExpression, range: nil)
let cursorPosition = textView.offset(from: textView.beginningOfDocument, to: selectedRange.start)
let textBetween = completeText.substring(Range(mentionStartPosition ... cursorPosition))
if textBetween.contains("@") {
let from = completeText.substring(from: cursorPosition)
if cursorPosition != 1 {
let beforeText = completeText.substring(from: cursorPosition - 1)
if beforeText == "@" {
isContainMention = false
searchText = ""
return true
}
}
searchText += from
}
else {
isContainMention = false
searchText = ""
}
}
return true
}
}
func substring(_ r: Range<Int>) -> String {
let fromIndex = self.index(self.startIndex, offsetBy: r.lowerBound)
let toIndex = self.index(self.startIndex, offsetBy: r.upperBound - 1)
let indexRange = Range<String.Index>(uncheckedBounds: (lower: fromIndex, upper:toIndex))
return String(self[indexRange])
}
func textView（textView:UITextView，shouldChangeTextIn范围：NSRange，replacementText:String）->Bool{
//var INTENTSTARTPOSITION:Int=0
//var iscontainention:Bool=false
//当用户键入TEXT COMPLETE TEXT时，在COMPLETETEXT中添加新字符
让completeText=textView.text+text
//检查用户是否按BACKSPACE键的字符
//对当前文本重新编码
如果let char=text.cString（使用：String.Encoding.utf8）{
//获取UNICODE的值
让isBackSpace=strcmp（字符“\\b”）
//退格按下
如果（isBackSpace==-92）{
如果让selectedRange=textView.selectedTextRange{
让cursorPosition=textView.offset（从：textView.BeginingOfDocument到：selectedRange.end）
如果提到StartPosition0{
searchText.removeLast（）
如果searchText.i为空{
isContainention=false
searchText=“”
}
}否则{
返回真值
}
}
}
如果让selectedRange=textView.selectedTextRange{
让空白=NSCharacterSet.whitespaces
让range=text.rangeOfCharacter（from:whitespace，options:.regularExpression，range:nil）
让cursorPosition=textView.offset（从：textView.BeginingOfDocument到：selectedRange.start）
设textBetween=completeText.substring（范围（提及StartPosition…光标位置））
如果textBetween.contains（“@”）{
let from=completeText.substring（from:cursorPosition）
如果光标位置！=1{
let beforeText=completeText.substring（from:cursorPosition-1）
如果beforeText==“@”{
isContainention=false
searchText=“”
返回真值
}
}
searchText+=来自
}
否则{
isContainention=false
searchText=“”
}
}
返回真值
}
}
func子字符串（r:Range）->字符串{
let fromIndex=self.index（self.startIndex，抵销方：r.lowerBound）
设toIndex=self.index（self.startIndex，offsetBy:r.upperBound-1）
设indexRange=Range（未选中边界：（下：fromIndex，上：toIndex））
返回字符串（self[indexRange]）
}