CODEWITHSUNDEEP
ioscocoa-touchuitextfield
Julian Osorio
Julian Osorio

Reputation: 1168

iOS textfield with partial secure text entry of the kind ••••••••••••••••0000

I am trying to create a textfield for entering a credit card number that appears as this:

••••••••••••••••0000

Basically, I need to support secure text entry in the textfield but, only until a given string length. After that point, the text should be displayed normal.

How can I do this?

Thanks.

Upvotes: 0

Views: 641

Answers (1)

user1488696
user1488696

Reputation:

You can accomplish this using a UITextFieldDelegate and implementing

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string;

e.g.

@interface

@property NSString * theActualText;
@property NSInteger numberOfCharactersToObscure;

@implementation

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{

    self.theActualText = [self.theActualText stringByReplacingCharactersInRange:range withString:string];

    NSInteger obscureLength = self.theActualText.length > self.numberOfCharactersToObscure ? self.numberOfCharactersToObscure : self.theActualText.length;

    NSRange replaceRange = NSMakeRange(0, obsuceLength);

    NSMutableString * replacementString = [NSMutableString new];

    for (int i = 0; i < obscureLength; i++) {
        [replacementString appendString:@"•"];
    }

    textField.text = [self.theActualText stringByReplacingCharactersInRange:range withString:replacementString];

    return NO;
}

Upvotes: 1

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