Xcode Interface Builder frustration with small floats

Originator:me
Number:rdar://12261748 Date Originated:08-Sep-2012 04:18 PM
Status:Open Resolved:
Product:Developer Tools Product Version:4.5 (4G144l)
Classification:UI/Usability Reproducible:Always
 
The other day I was adding a text field to show the pixel count of a view. I wanted to display the result as "4.3 MP", meaning 4.3 Megapixels (the underlying value was 4,300,000 as a CGFloat). As such I added an NSNumberFormatter to the bound text field, and tried to set its multiplier to 1e-6. Unfortunately, Xcode / IB wanted to "helpfully" truncate that to zero, which is nonsensical.

With that having failed, I instead tried to use the runtime key-value attributes, adding a key-value pair of "multiplier" and number of 1e-6. There too, the number was truncated to zero.

This behavior makes sense if the value were, say, a pixel offset. However, for arbitrary numbers (and in particular the NSNumberFormatter's "Multiplier"), clobbering values is frustrating and often incorrect.

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