Merge pull request #2 from klauslanza/klauslanza-lineChartYlabelFormatter

Klauslanza line chart ylabel formatter

@@ -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;
 
 /**

@@ -821,20 +821,26 @@
     }
 }
 
-
 - (NSString*) formatYLabel:(double)value{
-    if (!self.thousandsSeparator) {
-        NSString *format = self.yLabelFormat ? : @"%1.f";
-        return [NSString stringWithFormat:format,value];
+
+    if (self.yLabelBlockFormatter)
+    {
+        return self.yLabelBlockFormatter(value);
+    }
+    else
+    {
+        if (!self.thousandsSeparator) {
+            NSString *format = self.yLabelFormat ? : @"%1.f";
+            return [NSString stringWithFormat:format,value];
+        }
+        
+        NSNumberFormatter* numberFormatter = [[NSNumberFormatter alloc] init];
+        [numberFormatter setFormatterBehavior: NSNumberFormatterBehavior10_4];
+        [numberFormatter setNumberStyle: NSNumberFormatterDecimalStyle];
+        return [numberFormatter stringFromNumber: [NSNumber numberWithDouble:value]];
     }
-    
-    NSNumberFormatter* numberFormatter = [[NSNumberFormatter alloc] init];
-    [numberFormatter setFormatterBehavior: NSNumberFormatterBehavior10_4];
-    [numberFormatter setNumberStyle: NSNumberFormatterDecimalStyle];
-    return [numberFormatter stringFromNumber: [NSNumber numberWithDouble:value]];
 }
 
-
 - (UIView*) getLegendWithMaxWidth:(CGFloat)mWidth{
     if ([self.chartData count] < 1) {
         return nil;