Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>OK so you edit a text field using a numeric keyboard, which is dependent on the current locale, and thus get a text representation of a number, which is dependendt on the current locale, too. After editing has finished you read it and want to transform into a number. </p> <p>To convert you would use NSNumberFormatter like this:</p> <pre><code>NSNumberFormatter *nf = [[NSNumberFormatter alloc] init]; </code></pre> <p>You can setup the formatter as you will, setting locale (!), limits, formatting, decimal/grouping separator, number of decimal digits etc. Then you just use it:</p> <pre><code>float number = [nf numberFromString: field.text]; </code></pre> <p>And that's all! Now you have the number even if the text includes comma, provided you let both: keyboard and formatter, to have the same format, same style - i.e. probably just let current locale be used all over the place.</p> <p><strong>EDIT</strong></p> <p>this is a currency formatter, that can convert between string and number for currencies:</p> <pre><code>NSNumberFormatter *nf = [[NSNumberFormatter alloc] init]; [nf setNumberStyle: NSNumberFormatterCurrencyStyle]; [nf setRoundingMode: NSNumberFormatterRoundHalfUp]; [nf setMaximumFractionDigits: 2] </code></pre> <p>this is a percentage formatter with 4 decimal places:</p> <pre><code>NSNumberFormatter *nf = [[NSNumberFormatter alloc] init]; [nf setNumberStyle: NSNumberFormatterPercentStyle]; [nf setRoundingMode: NSNumberFormatterRoundHalfUp]; [nf setMaximumFractionDigits: 4]; </code></pre> <p>both in the current locale.</p> <p>As you see you can define the style, digits, rounding behaviour and much more, depending on numbers you are trying to enter. For more details (it is really a lot you can do with the NSNumberFormatter) you should read Apple docs, it would go beyond the scope of SO answer to describe it all.</p> <p>In your case, provided that paino and pituus are also UITextFields:</p> <pre><code>-(IBAction)calculate { NSNumberFormatter *nf = [[NSNumberFormatter alloc] init]; [nf setRoundingMode: NSNumberFormatterRoundHalfUp]; [nf setMaximumFractionDigits: 2]; float npaino = [[nf numberFromString: paino.text] floatValue]; float npituus = [[nf numberFromString: pituus.text] floatValue]; float x = npaino] / npituus *10000; label.text = [nf stringFromNumber: [NSNumber numberWithFloat: x]]; [nf release]; } </code></pre> <p>Now to avoid creating the formatter in each calculation you could make it an instance variable, since you need only one for those conversions.</p>
    singulars
    1. This table or related slice is empty.
    1. POUIKeyboardTypeDecimalPad - change comma to dot
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USTomasz Stanczak
    1. USTomasz Stanczak
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POUIKeyboardTypeDecimalPad - change comma to dot
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COThanks Tomasz, but I am new to IOS SDK and Xcode, can you provide some more information. I add some piece of my code, it is a simple calc function, trying learn from book.
      singulars
      1. PO
      1. USPavel Kaljunen
    2. COThank you Tomasz for a lot of information, but I have some errors. Can you check a screenshot - http://db.tt/gGOFNeT
      singulars
      1. PO
      1. USPavel Kaljunen
    3. COyea, right, my error, to work with NSNumberFormatter you have to use NSNumber instances and not float values directly- look at the edited code. Now I don't have XCode here to make a test, so bear with me and look at the docs in case of error - if you use XCode 4 you can show a help view within the right inspector panel, clicking on the links there will take you to the doc page in XCode organizer. iOS API is so huge, I'm still doing it all the time.
      singulars
      1. PO
      1. USTomasz Stanczak
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload