What am I doing wrong with allowsFractionalUnits on NSDateComponentsFormatter?

Question

Basically what I want is to get the value of a time interval represented in hours only, without rounding it to full hours (using NSDateComponentsFormatter to get it properly

Answer 1

According to Open Radar #32024200:

After doing some digging (disassembling Foundation), it looks like every call to -[_unitFormatter stringFromNumber:] in -[NSDateComponentsFormatter _stringFromDateComponents:] is passed an +[NSNumber numberWithInteger:] which drops floating point data.

You're not doing anything wrong. The flag is simply broken.