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UITextFieldには英数字のみを許可する

IOSで英数字のみの入力を許可するにはどうすればよいですかUITextField？

iosuitextfielduitextfielddelegate
21
Flax

UITextFieldDelegateメソッドを使用します-textField:shouldChangeCharactersInRange:replacementString:には、許可する文字の逆を含むNSCharacterSetを指定します。例えば：

// in -init, -initWithNibName:bundle:, or similar
NSCharacterSet *blockedCharacters = [[[NSCharacterSet alphanumericCharacterSet] invertedSet] retain];

- (BOOL)textField:(UITextField *)field shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)characters
{
    return ([characters rangeOfCharacterFromSet:blockedCharacters].location == NSNotFound);
}

// in -dealloc
[blockedCharacters release];

クラスがプロトコルを実装することを宣言する必要があることに注意してください（つまり、@interface MyClass : SomeSuperclass <UITextFieldDelegate>）を入力し、テキストフィールドのdelegateをクラスのインスタンスに設定します。

60
Noah Witherspoon

私はシンプルで実用的な答えを見つけて共有したいと思います：

イベントEditingChangedのUITextFieldを次のIBActionに接続します

-(IBAction) editingChanged:(UITextField*)sender
{    
    if (sender == yourTextField)
    {
        // allow only alphanumeric chars
        NSString* newStr = [sender.text stringByTrimmingCharactersInSet:[[NSCharacterSet alphanumericCharacterSet] invertedSet]];

        if ([newStr length] < [sender.text length])
        {
            sender.text = newStr;
        }
    }
}
11
Flax

これが私のやり方です：

// Define some constants:
#define ALPHA                   @"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
#define NUMERIC                 @"1234567890"
#define ALPHA_NUMERIC           ALPHA NUMERIC

// Make sure you are the text fields 'delegate', then this will get called before text gets changed.
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {

    // This will be the character set of characters I do not want in my text field.  Then if the replacement string contains any of the characters, return NO so that the text does not change.
    NSCharacterSet *unacceptedInput = nil;

    // I have 4 types of textFields in my view, each one needs to deny a specific set of characters:
    if (textField == emailField) {
        //  Validating an email address doesnt work 100% yet, but I am working on it....  The rest work great!
        if ([[textField.text componentsSeparatedByString:@"@"] count] > 1) {
            unacceptedInput = [[NSCharacterSet characterSetWithCharactersInString:[ALPHA_NUMERIC stringByAppendingString:@".-"]] invertedSet];
        } else {
            unacceptedInput = [[NSCharacterSet characterSetWithCharactersInString:[ALPHA_NUMERIC stringByAppendingString:@".!#$%&'*+-/=?^_`{|}~@"]] invertedSet];
        }
    } else if (textField == phoneField) {
        unacceptedInput = [[NSCharacterSet characterSetWithCharactersInString:NUMERIC] invertedSet];
    } else if (textField == fNameField || textField == lNameField) {
        unacceptedInput = [[NSCharacterSet characterSetWithCharactersInString:ALPHA] invertedSet];
    } else {
        unacceptedInput = [[NSCharacterSet illegalCharacterSet] invertedSet];
    }

    // If there are any characters that I do not want in the text field, return NO.
    return ([[string componentsSeparatedByCharactersInSet:unacceptedInput] count] <= 1);
}

ITextFieldDelegate Reference も確認してください。

11
chown

Swift 3バージョン

現在受け入れられている回答アプローチ：

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {

    // Get invalid characters
    let invalidChars = NSCharacterSet.alphanumerics.inverted

    // Attempt to find the range of invalid characters in the input string. This returns an optional.
    let range = string.rangeOfCharacter(from: invalidChars)

    if range != nil {
        // We have found an invalid character, don't allow the change
        return false
    } else {
        // No invalid character, allow the change
        return true
    }
}

別の同等に機能的なアプローチ：

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {

    // Get invalid characters
    let invalidChars = NSCharacterSet.alphanumerics.inverted

    // Make new string with invalid characters trimmed
    let newString = string.trimmingCharacters(in: invalidChars)

    if newString.characters.count < string.characters.count {
        // If there are less characters than we started with after trimming
        // this means there was an invalid character in the input. 
        // Don't let the change go through
        return false
    } else {
        // Otherwise let the change go through
        return true
    }

}
7
teradyl

SwiftでのRegExの方法：

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
     if string.isEmpty {
         return true
     }
     let alphaNumericRegEx = "[a-zA-Z0-9]"
     let predicate = NSPredicate(format:"SELF MATCHES %@", alphaNumericRegEx)
     return predicate.evaluate(with: string)
}
3
Au Ris

Swiftの場合：EditingChangedイベントのUITextFieldを次のIBActionに接続します。

@IBAction func ActionChangeTextPassport(sender:UITextField){
    if sender == txtPassportNum{
        let newStr = sender.text?.stringByTrimmingCharactersInSet(NSCharacterSet.alphanumericCharacterSet().invertedSet)
        if newStr?.characters.count < sender.text?.characters.count{
            sender.text = newStr
        }
    }
}
1
FARAZ

文字を確認するには、textField delegateメソッドを使用し、メソッドtextFieldDidBeginEditing、shouldChangeCharactersInRange、textFieldDidEndEditingを使用する必要があります。

ドキュメントについては このリンク を参照してください。

0
Legolas