Some in the development did not pay attention to the small knowledge, just afraid later forgot, has the trace to investigate

1...//The first argument is a condition, and if False, throws an exception, showing the information described by the second argument.

Nsassert (self.headerimgheight >= self.iconheight && self.iconheight > 0, @ "picture height should be greater than portrait height, avatar height should be greater than 0");

2 .....

decelerating when scrolling, the fingers release, but still continue to scroll, this time is yes, the other is no

Decelerationrate setting the deceleration rate after the finger release

Some in the development did not pay attention to the small knowledge, just afraid later forgot, has the trace to investigate