The chart will draw incorrectly if LineChart leftAxis.axisMinimum does not start at zero

[acumenrev]

What did you do?

Set LineChart leftAxis.axisMinimum = 70 (or not equal zero). The chart will draw incorrectly
In both cases, I set LineChart leftAxis.axisMaximum = 80

What did you expect to happen?

the spacing between the line 70 and 75 is same with 75 and 80 and the graph is expanded to the whole view

Charts Environment

Charts version/Branch/Commit Number: 3.0.2
Xcode version: 9.3.1
Swift version: 3.0
Platform(s) running Charts: iOS
macOS version running Xcode: High Sierra 10.13.4

Demo Project

This is a screenshot where I set LineChart leftAxis.axisMinimum = 0

And this one where I set LineChart leftAxis.axisMinimum = 70

[liuxuan30]

I don't understand. You set leftAxis.axisMinimum = 70 and it starts from 70 now.
and I tried with ChartsDemo with your [70, 80] range and a single dot, totally fine. So double check your view's frame, or ask on stack overflow.