键入总是(强制)小写或大写 - ios swift

Question

如何强制在swift语言中为某些文本字段输入小写或大写字母？

Answer 1

你应该return false在if block,因为你已经更新了文本框.

func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
        if textField.isEqual(textFieldBodrum) {
            textFieldBodrum.text = (textField.text as NSString).stringByReplacingCharactersInRange(range, withString: string.lowercaseString)
            return false
        } else if textField.isEqual(textFieldYalikavak) {
            textFieldYalikavak.text = (textField.text as NSString).stringByReplacingCharactersInRange(range, withString: string.uppercaseString)
            return false
        }
        return true
    }

如果你不想影响其他文本字段,你应该return true结束shouldChangeCharactersInRange function.

Answer 2

最简单的解决方案是将文本字段的autocapitalizationType属性设置.None为默认为小写输入或.AllCharacters默认为大写输入.用户仍然可以使用shift键来更改大小写.