xcode UITextfield 键盘只有字母，没有数字，没有大写字母，没有空格键？
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UITextfield keyboard with only alphabet, no numbers, no caps, no spacebar?
提问by gooberboobbutt
I want the keyboard for the UITextfield to only have a-z, no numbers, no special characters (!@$!@$@!#), and no caps. Basicly I am going for a keyboard with only the alphabet.
我希望 UITextfield 的键盘只有 az、没有数字、没有特殊字符 (!@$!@$@!#) 和大写字母。基本上我想要一个只有字母的键盘。
I was able to disable the space already. Anyone know how to disable numbers, special characters, and caps? A solution for any of these would be great.
我已经能够禁用该空间。有人知道如何禁用数字、特殊字符和大写字母吗？任何这些的解决方案都会很棒。
Is the best solution to do the below for all the characters but I dont want?
对所有角色执行以下操作的最佳解决方案是但我不想要吗？
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
if (string == " ") {
return false
}
if (string == "1") {
return false
}
return true
}
回答by Lennet
An easiet way would be:
一个简单的方法是：
if let range = string.rangeOfCharacterFromSet(NSCharacterSet.letterCharacterSet())
return true
}
else {
return false
}
回答by Santiago Carmona González
Swift 3 solution
斯威夫特 3 解决方案
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
let characterSet = CharacterSet.letters
if string.rangeOfCharacter(from: characterSet.inverted) != nil {
return false
}
return true
}
回答by iAj
Update for those who wants to Allow Space, Caps & Backspace Only
为那些只想允许空格、大写和退格的人更新
Swift 4.x, Swift 5.x & up
Swift 4.x、Swift 5.x 及更高版本
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
if range.location == 0 && string == " " { // prevent space on first character
return false
}
if textField.text?.last == " " && string == " " { // allowed only single space
return false
}
if string == " " { return true } // now allowing space between name
if string.rangeOfCharacter(from: CharacterSet.letters.inverted) != nil {
return false
}
return true
}
回答by AtulParmar
Swift 4.2 Code Allow only alphabets with allowing backspace if the user wants to remove wrong character
Swift 4.2 代码如果用户想要删除错误的字符，则只允许字母并允许退格
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
if string.rangeOfCharacter(from: .letters) != nil || string == ""{
return true
}else {
return false
}
}
回答by Devil Decoder
all the answers is working when user is not copy and paste in textfield for copy and paste to work use blow code
当用户未在文本字段中复制和粘贴以进行复制和粘贴以使用打击代码时，所有答案都有效
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
let text = (textField.text! as NSString).replacingCharacters(in: range, with: string)
let Regex = "[a-z A-Z ]+"
let predicate = NSPredicate.init(format: "SELF MATCHES %@", Regex)
if predicate.evaluate(with: text) || string == ""
{
return true
}
else
{
return false
}
}
回答by Ramprasath Selvam
class ViewController: UIViewController,UITextFieldDelegate {
@IBOutlet var phoneTextField:UITextField!
override func viewDidLoad() {
super.viewDidLoad()
self.phoneTextField.delegate = self
}
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool
{
let textString = (textField.text! as NSString).replacingCharacters(in: range, with: string)
if textField == self.phoneTextField && string.characters.count > 0 {
let LettersOnly = NSCharacterSet.Letters
let strValid = LettersOnly.contains(UnicodeScalar.init(string)!)
return strValid && textString.characters.count <= 10
}
return true
}
}
Try this code
In above code is only allow 10 char in text field
试试这个代码
在上面的代码中只允许文本字段中的 10 个字符
回答by Chandan Taneja
if isValidInput(Input: yourtextfieldOutletName.text!) == false {
let alert = UIAlertController(title: "", message;"Name field accepts only alphabatics", preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: nil))
self.present(alert, animated: true, completion: nil)
}
func isValidInput(Input:String) -> Bool {
let myCharSet=CharacterSet(charactersIn:"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
let output: String = Input.trimmingCharacters(in: myCharSet.inverted)
let isValid: Bool = (Input == output)
print("\(isValid)")
return isValid
}
回答by Dasoga
Swift 3 with spaces
带空格的 Swift 3
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
if string == " " { return true }
if let _ = string.rangeOfCharacter(from: CharacterSet.letters){
return true
}
return false
}
