I need a method to format a NSTimeInterval
(time span in seconds) into a string to produce something like \"about 10 minutes ago\", \"1h, 20min\",
You might want to refer to Facebook three20 framework. In their NSDateAdditions, they provided a few pretty formats for date. It might be better than you extend it.
Refer to the source at https://github.com/facebook/three20/blob/master/src/Three20Core/Sources/NSDateAdditions.m
- (NSString*)formatShortRelativeTime;
will give you "<1m", "50m", "3h", "3d"