问题
I want the user to only enter numeric values in a UITextField. On iPhone we can show the numeric keyboard, but on iPad the user can switch to any keyboard.
Is there any way to restrict user to enter only numeric values in a UITextField?
回答1:
Here is my 2 Cents. (Tested on Swift 2 Only)
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
let aSet = NSCharacterSet(charactersInString:"0123456789").invertedSet
let compSepByCharInSet = string.componentsSeparatedByCharactersInSet(aSet)
let numberFiltered = compSepByCharInSet.joinWithSeparator("")
return string == numberFiltered
}
This is just a little bit more strict. No decimal point either.
Hope it helps :)
PS: I assumed you looked after the delegate anyway.
Update: Swift 3.0 :
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
let aSet = NSCharacterSet(charactersIn:"0123456789").inverted
let compSepByCharInSet = string.components(separatedBy: aSet)
let numberFiltered = compSepByCharInSet.joined(separator: "")
return string == numberFiltered
}
回答2:
Solution for swift 3.0 and above
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool
{
let allowedCharacters = CharacterSet.decimalDigits
let characterSet = CharacterSet(charactersIn: string)
return allowedCharacters.isSuperset(of: characterSet)
}
回答3:
In swift 4.1 and Xcode 9.4.1
Add UITextFieldDelegate to your class
class YourViewController: UIViewController, UITextFieldDelegate
Then write this code in your viewDidLoad()
mobileNoTF.delegate = self
Write this textfield delegate function
//MARK - UITextField Delegates
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
//For mobile numer validation
if textField == mobileNoTF {
let allowedCharacters = CharacterSet(charactersIn:"+0123456789 ")//Here change this characters based on your requirement
let characterSet = CharacterSet(charactersIn: string)
return allowedCharacters.isSuperset(of: characterSet)
}
return true
}
回答4:
Swift 2.0
For only allowing numbers and one "." decimal in uitextfield.
func textField(textField: UITextField,shouldChangeCharactersInRange range: NSRange,replacementString string: String) -> Bool
{
let newCharacters = NSCharacterSet(charactersInString: string)
let boolIsNumber = NSCharacterSet.decimalDigitCharacterSet().isSupersetOfSet(newCharacters)
if boolIsNumber == true {
return true
} else {
if string == "." {
let countdots = textField.text!.componentsSeparatedByString(".").count - 1
if countdots == 0 {
return true
} else {
if countdots > 0 && string == "." {
return false
} else {
return true
}
}
} else {
return false
}
}
}
回答5:
Accept decimal values in text fields with single (.)dot in Swift 3
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
let inverseSet = NSCharacterSet(charactersIn:"0123456789").inverted
let components = string.components(separatedBy: inverseSet)
let filtered = components.joined(separator: "")
if filtered == string {
return true
} else {
if string == "." {
let countdots = textField.text!.components(separatedBy:".").count - 1
if countdots == 0 {
return true
}else{
if countdots > 0 && string == "." {
return false
} else {
return true
}
}
}else{
return false
}
}
}
回答6:
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
// return true if the replacementString only contains numeric characters
let digits = NSCharacterSet.decimalDigitCharacterSet()
for c in string {
if !digits.characterIsMember(c) {
return false
}
}
return true
}
This solution will work even if the user switches keyboards or tries to paste a non-numeric string into the text field.
Make sure to set the delegate property of the appropriate text field.
回答7:
IPhone only solution
In whatever UITextField you're getting these values from, you can specify the kind of keyboard you want to appear when somebody touches inside the text field.
E.G. a numeric-only keyboard.
Like this screenshot:
Ipad
The iPad does not support the numeric keyboard, so your options are to either not support the iPad, validate the field post submit, or follow one of the other suggestions here to create sane behaviors while running on an iPad.
回答8:
Use number formatter
Swift 4.x
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
let s = NSString(string: textField.text ?? "").replacingCharacters(in: range, with: string)
guard !s.isEmpty else { return true }
let numberFormatter = NumberFormatter()
numberFormatter.numberStyle = .none
return numberFormatter.number(from: s)?.intValue != nil
}
回答9:
Here is a simple solution, you need to connect the event "Editing changed" to this method in your controller
Swift 4
@IBAction func valueChanged(_ sender: UITextField) {
if let last = sender.text?.last {
let zero: Character = "0"
let num: Int = Int(UnicodeScalar(String(last))!.value - UnicodeScalar(String(zero))!.value)
if (num < 0 || num > 9) {
//remove the last character as it is invalid
sender.text?.removeLast()
}
}
}
回答10:
I had actually done this when working through the Big Nerd Ranch book, my solution is:
func textField(textField: UITextField,
shouldChangeCharactersInRange range: NSRange,
replacementString string: String) -> Bool {
let newCharacters = NSCharacterSet(charactersInString: string)
return NSCharacterSet.decimalDigitCharacterSet().isSupersetOfSet(newCharacters)
}
this only allows the numbers 0-9, to allow the "." as well is more complicated as you can only allow one "."
回答11:
While most of these solutions will work, be aware that in some localisations a decimals are separated with a "," and not a "."
The cleaner way to do this would be
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
let decimalCharacter = NSNumberFormatter().decimalSeparator
let characterSet = NSMutableCharacterSet.decimalDigitCharacterSet()
characterSet.addCharactersInString(decimalCharacter)
return replacementString.rangeOfCharacterFromSet(characterSet.invertedSet) == nil
}
回答12:
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
if let numRange = string.rangeOfCharacterFromSet(NSCharacterSet.letterCharacterSet()) {
return false
} else {
return true
}
}
回答13:
To allow only numbers and just one decimal operator, you can use this solution:
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
let isNumber = NSCharacterSet.decimalDigitCharacterSet().isSupersetOfSet(NSCharacterSet(charactersInString: string))
return isNumber || (string == NSNumberFormatter().decimalSeparator && textField.text?.containsString(string) == false)
}
回答14:
Tested in swift 3.0
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool
{
let numberOnly = NSCharacterSet.init(charactersIn: "0123456789")
let stringFromTextField = NSCharacterSet.init(charactersIn: string)
let strValid = numberOnly.isSuperset(of: stringFromTextField as CharacterSet)
return strValid
}
回答15:
Extend your view controller like this:
class MyViewController: UIViewController, UITextFieldDelegate
In the viewDidLoad function extend to your text field like this:
myTextField.delegate = self
And then use the following function:
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
let isNumber = CharacterSet.decimalDigits.isSuperset(of: CharacterSet(charactersIn: string))
let withDecimal = (
string == NumberFormatter().decimalSeparator &&
textField.text?.contains(string) == false
)
return isNumber || withDecimal
}
This will now make sure the user can enter only decimal digits.
Swift 4 + Accepts Number only and accepts one separator
回答16:
1st you have to inherit the UITextFieldDelegate class with you own class
class ViewController: UIViewController, UITextFieldDelegate {
2nd add an IBOutlet
@IBOutlet weak var firstName: UITextField!
3rd you have to assure this object is using
override func viewDidLoad() {
super.viewDidLoad()
firstName.delegate = self
}
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
if textField == firstName {
let allowedCharacters = "1234567890"
let allowedCharacterSet = CharacterSet(charactersIn: allowedCharacters)
let typedCharacterSet = CharacterSet(charactersIn: string)
let alphabet = allowedCharacterSet.isSuperset(of: typedCharacterSet)
return alphabet
}
}
回答17:
I think you can force change the keyboard type by implementing UITextInputTraits protocol, optional var keyboardType
//class ViewController: UIViewController, UITextInputTraits {
@IBOutlet weak var textFieldKeyboardType: UITextField!{
didSet{
textFieldKeyboardType.keyboardType = UIKeyboardType.NumberPad
}
}
var keyboardType: UIKeyboardType {
get{
return textFieldKeyboardType.keyboardType
}
set{
if newValue != UIKeyboardType.NumberPad{
self.keyboardType = UIKeyboardType.NumberPad
}
}
}
回答18:
As if there aren't enough answers, here's mine. I think every example allowed for decimal separators is flawed in either localization, backspaces, or copy/paste.
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
if string.isEmpty {return true} //allow for backspace
let decimalSeparator = NSNumberFormatter().decimalSeparator ?? "."
let validChars = NSMutableCharacterSet(charactersInString: decimalSeparator)
validChars.formUnionWithCharacterSet(NSCharacterSet.decimalDigitCharacterSet())
if validChars.isSupersetOfSet(NSCharacterSet(charactersInString: string)){
switch string.componentsSeparatedByString(decimalSeparator).count-1 {
case 0: //no decimals
return true
case 1: //if adding decimal, only allow if no existing decimal
if let existingText = textField.text{
return existingText.componentsSeparatedByString(decimalSeparator).count <= 1
}
else {return true}
default: //invalid decimals
return false
}
}
return false
}
回答19:
The following is the code I used in Swift 3.0 adapted from Mr H's code. Differences are because:
a) Delegate function declaration has changed in Swift 3.0. New declaration here
b) NSCharacterSet declaration has changed.
func textField(_ shouldChangeCharactersIntextField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool
{
let inverseSet = NSCharacterSet(charactersIn:"0123456789").inverted
let components = string.components(separatedBy: inverseSet)
let filtered = components.joined(separator: "")
return string == filtered
}
回答20:
I have edited Raj Joshi's version to allow one dot or one comma:
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
let inverseSet = CharacterSet(charactersIn:"0123456789").inverted
let components = string.components(separatedBy: inverseSet)
let filtered = components.joined(separator: "")
if filtered == string {
return true
} else {
if string == "." || string == "," {
let countDots = textField.text!.components(separatedBy:".").count - 1
let countCommas = textField.text!.components(separatedBy:",").count - 1
if countDots == 0 && countCommas == 0 {
return true
} else {
return false
}
} else {
return false
}
}
}
回答21:
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 numberOnly = NSCharacterSet.decimalDigits
let strValid = numberOnly.contains(UnicodeScalar.init(string)!)
return strValid && textString.characters.count <= 10
}
return true
}
in above code is working in swift 3
NSCharacterSet.decimalDigits
You are also use letters only
NSCharacterSet.Letters
and uppercase,Lowercaseand,alphanumerics,whitespaces
is used same code
or See the Link
回答22:
For allow some charactors
func CheckAddress(string:String) -> Bool {
let numberOnly = NSCharacterSet.init(charactersIn: "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-@,&#/")
let stringFromTextField = NSCharacterSet.init(charactersIn: string)
return numberOnly.isSuperset(of: stringFromTextField as CharacterSet)
}
print("\(CheckAddress(string: "123"))") //True
print("\(CheckAddress(string: "asdf-"))") //True
print("\(CheckAddress(string: "asd123$"))") //false
回答23:
Here's an cleaner solution:
guard CharacterSet(charactersIn: "123456789").isSuperset(of: CharacterSet(charactersIn: string)) else {
return false
}
return true
For decimals just add ., example 123456789.
回答24:
Swift 2.0
func textField(textField: UITextField,
shouldChangeCharactersInRange range: NSRange,
replacementString string: String) -> Bool {
let inverseSet = NSCharacterSet(charactersInString:"0123456789").invertedSet
let components = string.componentsSeparatedByCharactersInSet(inverseSet)
let filtered = components.joinWithSeparator("")
return string == filtered
}
回答25:
This is a more readable version that will do "0-9" plus ".":
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
let existingTextHasDecimal = textField.text?.rangeOfString(".")
let replacementTextHasDecimal = string.rangeOfString(".")
let replacementTextAllCharacters = NSCharacterSet(charactersInString: string)
let replacementTextOnlyDigits = NSCharacterSet.decimalDigitCharacterSet().isSupersetOfSet(replacementTextAllCharacters)
if replacementTextHasDecimal != nil && existingTextHasDecimal != nil {
return false
}else{
if replacementTextOnlyDigits == true {
return true
}else if replacementTextHasDecimal != nil{
return true
}else{
return false
}
}
}
回答26:
func isValidNumber(str:String) -> Bool{
if str.isEmpty {
return false
}
let newChar = NSCharacterSet(charactersInString: str)
let boolValid = NSCharacterSet.decimalDigitCharacterSet().isSupersetOfSet(newChar)
if boolValid{
return true
}else{
let lst = str.componentsSeparatedByString(".")
let newStr = lst.joinWithSeparator("")
let currentChar = NSCharacterSet(charactersInString: newStr)
if lst.count == 2 && !lst.contains("") && NSCharacterSet.decimalDigitCharacterSet().isSupersetOfSet(currentChar){
return true
}
return false
}
}
Put this function in your "Submit" or "Save" method if there is one.
回答27:
You can use shouldChangeCharactersInRange along with String extension method to check if the input string is number or not.
extension String {
var isNumber : Bool {
get{
return !self.isEmpty && self.stringWithoutWhitespaces.rangeOfCharacter(from: CharacterSet.decimalDigits.inverted) == nil
}
}
var stringWithoutWhitespaces: String {
return self.replacingOccurrences(of: " ", with: "")
}
}
//Mark: shouldChangeCharactersInRange
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
// return true if the string only contains numeric characters
let isValid = string.stringWithoutWhitespaces.isNumber
return valid
}
回答28:
Dead simple solution for Double numbers (keep it mind that this is not the best user-friendly solution), in your UITextFieldDelegate delegate:
func textField(_ textField: UITextField,
shouldChangeCharactersIn range: NSRange,
replacementString string: String) -> Bool {
guard let currentString = textField.text as NSString? else {
return false
}
let newString = currentString.replacingCharacters(in: range, with: string)
return Double(newString) != nil
}
回答29:
You can use this code if you want to allow decimal separator and/or negative numbers. But this code allows example: "34." (decimal separator at the end) while changing text. So you have to add some code example: textFieldShouldReturn or textFieldShouldEndEditing delegate functions.
The code written in Swift 4 but I assueme this is compatible with Swift 3.
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
guard let text = textField.text else {
return true
}
let replaced = (text as NSString).replacingCharacters(in: range, with: string)
let decimalSeparator = NSLocale.current.decimalSeparator ?? ""
// When user wants to delete las character
if replaced == "" || replaced == "-" || replaced == "-0" {
textField.text = "0"
return false
}
// When text contains 0 before replace except "0."
if replaced != "0" + decimalSeparator && replaced.hasPrefix("0") && text.underestimatedCount == 1 {
textField.text = replaced.substring(from: replaced.index(after: replaced.startIndex))
return false
}
// When user wants to delete minus sign
if text.hasPrefix("-") && text.substring(from: text.index(after: text.startIndex)) == replaced {
return false
}
// When user wants to delete before decimal separator
if replaced.hasPrefix(decimalSeparator) || replaced.hasPrefix("-" + decimalSeparator) {
return false
}
// When user wants to add zero the beginning of number... but allowing "0." or "-0." numbers
let testReplaced = replaced.hasPrefix("-") ? replaced.substring(from: replaced.index(after: replaced.startIndex)) : replaced
if testReplaced.count >= 2 && testReplaced.hasPrefix("0") && !testReplaced.hasPrefix("0" + decimalSeparator) {
return false
}
// Every other cases
let allowDecimal = self.allowFloat ? (decimalSeparator == "." ? "\\.?" : decimalSeparator + "?") : ""
let allowSign = self.allowSigned ? "-?" : ""
let pattern = "\(allowSign)[0-9]+\(allowDecimal)([0-9]+)?"
do {
let regexRange = (replaced as NSString).range(of: replaced)
let regex = try NSRegularExpression(pattern: pattern, options: [])
let matches = regex.matches(in: replaced, options: [], range: regexRange)
return matches.count == 1 && matches.first!.range == regexRange
}
catch {}
return false
}
If you don't want to allow decimal or negative numbers you have to replace tow variable with next line
let allowDecimal = ""
let allowSign = ""
回答30:
Swift 3
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
if textField==yourTextFieldOutlet {
if(CharacterSet.decimalDigits.isSuperset(of: CharacterSet(charactersIn: yourTextFieldOutlet.text!))){
//if numbers only, then your code here
}
else{
showAlert(title: "Error",message: "Enter Number only",type: "failure")
}
}
return true
}
来源：https://stackoverflow.com/questions/30973044/how-to-restrict-uitextfield-to-take-only-numbers-in-swift