FIX: Line Graph - Setting all data values to the same value causes NaN exception. about graphkit

[9SL9]

If I change your example code with this it causes crash
self.data = @[@[@1, @1, @1, @1, @1, @1, @1],];

[michalkonturek]

Thank you for reporting this issue. I have renamed the title to be more adequate to the problem.

The crash is caused by NaN, which is a special float value meaning "not a valid float number". In most cases it is caused by division by zero, and that is the case in this instance also.

In order to calculate scale value, GKLineGraph uses minValue and maxValue of all line data values.

CGFloat scale = (value - [self _minValue]) / ([self _maxValue] - [self _minValue]);

From the code above you can clearly see that you will cause division by zero each time you pass values which are the same number.

To fix that problem, simply pass data for another line (at index 0), and set that line color to clear.

self.data = @[
                  @[@2, @2, @2, @2, @2, @2, @6],
                  @[@1, @1, @1, @1, @1, @1, @1]
                  ];