设置UITextView和UITextField的最大字符数

更新 Swift 4.X

func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {    let newText = (textView.text as NSString).replacingCharacters(in: range, with: text)    let numberOfChars = newText.count    return numberOfChars < 10    // 10 Limit Value}

试试看：

func textView(textView: UITextView, shouldChangeTextInRange range: NSRange, replacementText text: String) -> Bool {    let newText = (textView.text as NSString).stringByReplacingCharactersInRange(range, withString: text)    let numberOfChars = newText.characters.count // for Swift use count(newText)    return numberOfChars < 10;}