Merge pull request #66 from mkubenka/limit-line-xaxis

Fix x-axis limit line render issue + x-limit-line example

Author: danielgindi

Charts/Classes/Renderers/ChartXAxisRenderer.swift

@@ -244,7 +244,7 @@ public class ChartXAxisRenderer: ChartAxisRendererBase
 
             _limitLineSegmentsBuffer[0].x = position.x;
             _limitLineSegmentsBuffer[0].y = viewPortHandler.contentTop;
-            _limitLineSegmentsBuffer[1].x = position.y;
+            _limitLineSegmentsBuffer[1].x = position.x;
             _limitLineSegmentsBuffer[1].y = viewPortHandler.contentBottom;
 
             CGContextSetStrokeColorWithColor(context, l.lineColor.CGColor);

ChartsDemo/Classes/Demos/LineChart1ViewController.m

@@ -57,6 +57,15 @@ - (void)viewDidLoad
     _chartView.pinchZoomEnabled = YES;
     _chartView.highlightIndicatorEnabled = NO;
 
+    // x-axis limit line
+    ChartLimitLine *llXAxis = [[ChartLimitLine alloc] initWithLimit:10.f label:@"Index 10"];
+    llXAxis.lineWidth = 4.f;
+    llXAxis.lineDashLengths = @[@(10.f), @(10.f), @(0.f)];
+    llXAxis.labelPosition = ChartLimitLabelPositionRight;
+    llXAxis.valueFont = [UIFont systemFontOfSize:10.f];
+    
+    [_chartView.xAxis addLimitLine:llXAxis];
+    
     ChartLimitLine *ll1 = [[ChartLimitLine alloc] initWithLimit:130.f label:@"Upper Limit"];
     ll1.lineWidth = 4.f;
     ll1.lineDashLengths = @[@5.f, @5.f];