无法将types'NSRange'（aka'_NSRange'）的值转换为期望的types'Range <Index>'（又名'Range <String.CharacterView.Index>'）

在检查string范围时得到此错误…

@objc func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool { let shouldChange = false let text = textField.text var newString = text!.stringByReplacingCharactersInRange(range, withString: string) as? NSString if newString.length > 14{ newString = newString.substringToIndex(14) } textField.text = newString.uppercaseString return shouldChange } 

Answer 1

而不是text! 说(text! as NSString) 。

 var newString = (text! as NSString).stringByReplacingCharactersInRange(range, withString: string) as? NSString