How to set Minimum and Maximum limit to Uitextfield?

问题

i need to set minimum and maximum limit value to one single textfield i.e the number should start with minimum 2 digits and maximum 5 digits here i tried some methods

-(BOOL)validatenumber:(NSString*)Number{

if ([Number length ]>=2)  {
    return NO;
}

return YES;

}

回答1:

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{

NSInteger inte = [textField.text intValue];
if (inte <5 && inte > 2)

    return NO;
else 
    return YES;
}

Swift

override func textFieldShouldReturn(textField: UITextField) -> Bool {
var inte: Int = CInt(textField.text!)!
if inte < 5 && inte > 2 {
    return false
}
else {
    return true
}
}

回答2:

if ([amount.text length]>=2 && [amount.text length]<=5) {
    }else{
    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"error" message:@"Plz enter the amout Min 10Rs" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
    [alert show];
    return;
}

回答3:

I would first check that you can parse a number from your string, and then check the range of the number

-(BOOL)validatenumber:(NSString*)Number{

    NSCharacterSet *characterSet = [[NSCharacterSet characterSetWithCharactersInString:@"0123456789,."] invertedSet];
    if ([Number rangeOfCharacterFromSet:characterSet].location != NSNotFound)
    {
        return NO;
    }

    return ([Number intValue] >= 100 && [Number intValue] <= 99999);
}

Set the delegate to your UITextField. And run validate when the user finishes editing your UITextField in function func textFieldDidEndEditing(_ textField: UITextField). Present a popup alert to the user if validation fails

来源：https://stackoverflow.com/questions/26582453/how-to-set-minimum-and-maximum-limit-to-uitextfield

标签

ios

objective-c

iphone

swift

uitextfield