Merge pull request #208 from klauslanza/klauslanza-lineChartYlabelFormatter

Line chart ylabel formatter block

@@ -66,6 +66,11 @@
  */
 @property (nonatomic, strong) NSString *yLabelFormat;
 
+/**
+ * Block formatter for custom string in y-axis labels. If not set, defaults to yLabelFormat
+ */
+@property (nonatomic, copy) NSString* (^yLabelBlockFormatter)(CGFloat);
+
 - (void)setXLabels:(NSArray *)xLabels withWidth:(CGFloat)width;
 
 /**

@@ -821,8 +821,14 @@
     }
 }
 
-
 - (NSString*) formatYLabel:(double)value{
+
+    if (self.yLabelBlockFormatter)
+    {
+        return self.yLabelBlockFormatter(value);
+    }
+    else
+    {
         if (!self.thousandsSeparator) {
             NSString *format = self.yLabelFormat ? : @"%1.f";
             return [NSString stringWithFormat:format,value];
@@ -832,9 +838,9 @@
         [numberFormatter setFormatterBehavior: NSNumberFormatterBehavior10_4];
         [numberFormatter setNumberStyle: NSNumberFormatterDecimalStyle];
         return [numberFormatter stringFromNumber: [NSNumber numberWithDouble:value]];
+    }
 }
 
-
 - (UIView*) getLegendWithMaxWidth:(CGFloat)mWidth{
     if ([self.chartData count] < 1) {
         return nil;