Why is the text upside down?

Question

I implemented corePlot into my xcode project. I'm trying to add the legend to another cell .

I'm able to add the legend to another cell, but when I do that, the text is upside down.

Here is my code:

- (void)configureLegend
{
    CPTGraph *graph = self.hostView.hostedGraph;
    CPTLegend *theLegend = [CPTLegend legendWithGraph:graph];

    // Add legend to graph
    graph.legend = theLegend;
    graph.legendAnchor = CPTRectAnchorRight;
    CGFloat legendPadding = - (self.chartView.bounds.size.width / 8);
    graph.legendDisplacement = CGPointMake(legendPadding, 0.0);

    UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:2 inSection:0]];
    [cell.layer addSublayer:graph.legend];

This is what I tried:

    theLegend.transform = CATransform3DMakeRotation(M_PI / 180.0f, 0, 1, 0);
}

That didn't do anything. The results where the same. Why is this happening, and how can I get the text to show normally, not upside down?

Edit

This is how it shows when I add it as a subLayer: (It says: "First", "Second".)

Answer 1

Try M_PI / 2.0f which is in radians. Using 180.0f (presumably degrees) does not make sense in the context of this function.

Answer 2

Core Plot applies a flip transform on iOS so we can use the same drawing code on both the Mac and iOS. This is the transform it uses:

self.layer.sublayerTransform = CATransform3DMakeScale( CPTFloat(1.0), CPTFloat(-1.0), CPTFloat(1.0) );