Minor issues, but very good speed. The bonus goal is not fully implemented.

The app crashes when you zoom in on 4th chart, hide first graph go back and try to put tooltip

Chart #5
- Weird Y-lines in zoomed out state, not like in design, I mean their values, no 100 line.
- No spacing between dates labels and chart.
- When trying to zoom in from 3 May, I get to 5 May.
- 28 Apr 2018 -> Percent values do not add up to 100, only 99.
- Pie slices in zoomed in states are not selectable.
- Nice animation of visibility change in zoomed in state, although absence of percent labels kills usability entirely, probably should have invested time there instead.

Another bug related to bar chart appearance animation. Orange column is visible, but it shouldn't.

Incorrect mask on bar chart

Y axis dont disappear on double y axis graph

Multi-touch not supported in range control selectol.

Can't grab and move another side of the selector while first one under the finger.

Yeah, it wasn't any requirements about it, but iPhone was built with multitouch support from the ground and this issue looks not user friendly and wierd. 

maxY on chart has to be on the same position as y-coordinate of the highest y-value by design

Moving annotation is unpleasant, because it appears with delay, moves the tableview while you move your finger, and disappears too quickly for all the effort you make to put it on the chart

y-line on area chart doesn't match the required design

— The box with the details about points on the graphs stays for about 3 seconds before hiding.
— Incorrect animation of the points on the graphs.

# All charts
- Very annoying that you cannot tap or long tap to call the values view. Only gets called on horizontal swipe.
- Has been reported before, but cannot be seen from that screenshot. Values in values view have no spacing separators (ex. 1000000 instead of 1 000 000).
- The values view disappears pretty fast after you remove finger, on its own. To me that is not very convenient.

Chart #1
- Some line endings are not rounded.
- Point gets clipped when its in the bottom.
- Graphs lines along the 0 value are clipped.

Chart #2
- Too easy Y-labels rounding, could be rounded a little smarter and prettier, to avoid values like 746.2k
- Sometimes impossible to read values on Y-label axis, because they get mixed up with the graphs
color y labels do not disappear together with the graph.
- Very weird time labels in zoomed in state, showing uneven values like 20:27

Chart #3
- When moving the selector pretty fast, the animation first animates the move, and only after that animates change of max. In two distinct steps. That is easier to accomplish, then simultaneous animation of max and moving to the side.
- Values view can cover the selected bar.

Chart #4
- In zoomed in state values are supposed to be shown from 00:00 -> 23:55, not from 9:50 -> 20:10

Sometimes x-axis labels overlap each other and stay in such position.

When zoomed in x-axis labels have strange values. Extra space on bottom of the cell.

User can hide line on chart where it shouldn't be possible.

Values have no grouping separators.

Strange animation during bar when chart column visibility changes (relatively small values become big). Probably caused by animating column appearance from origin.

Zooming in on the last date doesnt show the whole week

+ zoomed in charts always show 1 date -> cant tell which date am i looking at

lines are sometimes higher than the local min

wrong minimum

dates are clipped

selection circle is under line chart

Nice performance. I think I understood your drawing algorithm from Stage 1 and implemented it in Stage 2. Still, you have 2-3 fps more. I hope it is just more accurate optimizations with CATextLayers.
You have 54 fps during 1st chart scaling on iPhone 6+. Very good result, although not the best one this time.

Chart max line is too higher above the last y-axis line

Wrong start date

Last label on x-axis is cutted off

Thousands must be shortened too

Wrong chart position

Empty space under the charts

Labels on y-axis must be hidden with charts

Percentage chart should have a step of 25%

No labels, no tooltip, zoomed view is incomplete

"A long tap on any data filter should uncheck all other filters"

Vertical and horizontal scrolling are both enabled at the same time