RxSwift UITextView限制输入字符长度(带emoji表情) 超简单实现

textInput.rx.text.orEmpty
        .subscribe (onNext: { [weak self] in
            guard let `self` = self else { return }

            if $0.utf16.count > 100 {
                let selectedRange = self.textInput.markedTextRange
                //没有在拼写状态再判断
                if selectedRange == nil {
                    //通过字符串截取实现限制100字符长度
                    self.textInput.text = ($0 as NSString).substring(to: 100)
                }
            }
            self.lengthLabel.text = "\($0.utf16.count)/100"
            
        })
        .disposed(by: bag)