I also have implemented a UITextField for numeric (currency and percentage)
input. Here is my experience:
1- I found the Number Pad keyboard fatally lacking due to omission of a decimal
point character and a "Done" key. So use a Numbers and Punctuation keyboard.
2- I did not use a UIPickerView because I think this is too much work for the
user. (This of course is debatable).
I used:
-(BOOL)textField:(UITextField *)textField
shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString
*)string
to disallow unwanted characters based on context and:
- (void)textFieldDidEndEditing:(TVDecimalNumberTextField *)textField
to ensure an in-range value.
Hope this helps,
Martin
On 2011-07-26, at 6:43 AM, cocoa-dev-requ...@lists.apple.com wrote:
> Message: 5
> Date: Mon, 25 Jul 2011 19:29:06 -0700
> From: Howard Siegel <hsie...@gmail.com>
> Subject: Re: UITextField Questions
> To: "cocoa-dev@lists.apple.com" <cocoa-dev@lists.apple.com>
> Cc: Brooke Gravitt <bro...@gravitt.org>
> Message-ID:
> <camxiym8eatj9y2zefa+g3y9xweqpvhzj1duz5fro5+dk8i_...@mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> On Mon, Jul 25, 2011 at 18:31, Brooke Gravitt <bro...@gravitt.org> wrote:
>
>> On Mon, Jul 25, 2011 at 9:19 PM, Conrad Shultz
>> <con...@synthetiqsolutions.com> wrote:
>>> Take a look at UITextInputTraits to specify a numeric keyboard. (IIRC
>> this can be done in IB too.)
>>>
>>> Take a look at UITextFieldDelegate's textFieldShouldEndEditing: method to
>> perform validation of input.
>>>
>>> I should also point out that often a text field is not the most
>> appropriate control for restricted numeric input. If you have a reasonably
>> small finite set of input values, consider UIPickerView. If you have a
>> finite range for input, consider UISlider.
>>>
>>> (Sent from my iPhone.)
>>>
>>> --
>>> Conrad Shultz
>>
>> Conrad,
>>
>> Thanks for the response! The fields in question are for setting a
>> price and a percentage, respectively. They don't seem to fit into
>> either category. I'll take a look at the UITextInputTraits && the
>> delegate's textFieldShouldEndEditing method as well!
>>
>> Thanks!
>>
>> Brooke
>>
>
> Brooke,
>
> You would likely be much better off using UIPickerViews, or a UIPickerView
> and a UISlider as Conrad suggests. If the UISlider doesn't give you enough
> selection precision, then use another UIPickerView. You use the UITextField
> to keep the value for display purposes, but use the UIPickerViews for the
> value selection.
>
> In order to use the UITextField for display and the UIPickerView for the
> value
> selection instead of the keypad you would need to create the UIPickerViews
> and then set the UITextField inputView to the appropriate UIPickerView. When
> the user taps in the text field, instead of a keypad coming up, the picker
> view
> will come up. You can also set the inputAccesoryView to a UIToolbar that
> contains a "done" button so the picker view can be dismissed once the
> user selects the value.
>
> The picker view for the percentage would contain 2 or 3 columns for the
> decimal part (0 to 100) and as many columns for the fractional part as
> needed.
>
> The picker view for the price would contain as many columns for the
> dollar amount and 2 columns for the pennies. This assumes that the
> price value isn't too outrageously large that you can't fit the dollar
> amount
> in to columns such that the picker view becomes too wide, and you can
> get pretty wide if you drop the font size used for the columns.
>
> I can dig out some links to StackOverflow threads that I used to code up
> exactly this type of user interface in an app that I am writing.
>
> - h
>
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