开发语言 ios swift UITextField限制长度终极方法

UITextField限制长度

1、字符串截取

extension String {

/// 截取字符串

/// - Parameters:

/// - begin: 开始截取的索引

/// - count: 需要截取的个数

/// - Returns: 字符串

func substring(start: Int, _ count: Int) -> String {

let begin = index(startIndex, offsetBy: max(0, start))

let end = index(startIndex, offsetBy: min(count, start + count))

return String(self[begin..

}

}

2、UITextField限制长度

// MARK: - textField 长度裁剪

static func clipTextFieldTextLength(textField: UITextField, limitNum: Int) -> String? {

var finalText = textField.text

if let text = textField.text, limitNum > 0 && text.count > limitNum {

if let language = UITextInputMode.activeInputModes.first?.primaryLanguage, language == "zh-Hans", let range = textField.markedTextRange {

let start = range.start

let end = range.end

let selLength = textField.offset(from: start, to: end)

let contentLength = text.count - selLength

if (contentLength > limitNum) {

finalText = text.substring(start: 0, limitNum)

}

} else {

finalText = text.substring(start: 0, limitNum)

}

}

return finalText

}

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