How to accept numbers in input field only in iphone app

Question

I am making an app i want that when user inputs any data then whatever user enter like if he enters a so it does not take this input and show nothing in textfield and if it enter any number then it should accept.

Why don't you use a numeric keypad then ? Make your keyboard type UIKeyboardTypeNumberPad — Midhun MP, Mar 13 '13 at 08:34
See the types of keyboard. You can set according to your need. http://stackoverflow.com/questions/7301018/programmatically-change-uitextfield-keyboard-type — Baby Groot, Mar 13 '13 at 09:06

score 4 · Accepted Answer · answered Mar 13 '13 at 08:47

Following code should help you, this will not allow any other text to be entered in your text field other than numbers.

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    static NSCharacterSet *charSet = nil;
    if(!charSet) {
    charSet = [[[NSCharacterSet characterSetWithCharactersInString:@"0123456789"] invertedSet] retain];
    }
    NSRange strLocation = [string rangeOfCharacterFromSet:charSet];
    return (strLocation.location == NSNotFound);
}

Kasaname · Answer 2 · 2013-03-13T08:37:23.403

2

Why do u do this better give a keyboard style

[txtField setKeyboardType:UIKeyboardTypeNumberPad]

or u can do it programatically :

NSString *nameRegex = @"[0-9]*";
NSPredicate *nameTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", nameRegex];
BOOL value = [nameTest evaluateWithObject:string];
if(value == YES)
    {
 // Do Somethings
    }
    else 
        {

    // Do something
    }

edited Mar 13 '13 at 08:37

answered Mar 13 '13 at 08:31

Kasaname

1,491
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15

score 0 · Answer 3 · answered Mar 13 '13 at 08:32

0

you need to set keyboard type of Textfield as Numberpad.

Try this using code : (also u can set with Inter face builder on XIB property)

[txtFieldObj setKeyboardType:UIKeyboardTypeNumberPad];

answered Mar 13 '13 at 08:32

Satish Azad

2,302
1
16
35

score 0 · Answer 4 · answered Mar 13 '13 at 08:38

-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
if (textField.tag==3)
{
    NSUInteger lengthOfString = string.length;
    for (NSInteger loopIndex = 0; loopIndex < lengthOfString; loopIndex++)
    {
        unichar character = [string characterAtIndex:loopIndex];
        if (character < 46 || character==47)
            return NO;
        if (character > 57)
            return NO;
    }
}

Set tag to your textField.

score 0 · Answer 5 · answered Mar 13 '13 at 09:58

 NSUInteger lengthOfString = string.length;
    for (NSInteger loopIndex = 0; loopIndex < lengthOfString; loopIndex++) {
        unichar character = [string characterAtIndex:loopIndex];
        if (character < 48) return NO; // 48 unichar for 0
        if (character > 57) return NO; // 57 unichar for 9
    }

this is the code should be written in textfield should change characters inrange

How to accept numbers in input field only in iphone app

5 Answers5