fix bug - unsupport yLabels

@@ -72,7 +72,7 @@
     //make the _yLabelSum value dependant of the distinct values of yValues to avoid duplicates on yAxis
     int yLabelsDifTotal = (int)[NSSet setWithArray:yValues].count;
   
-    // !!!: 调整Y坐标的显示值
+    // !!!: 生效Y轴坐标的最大值
     if (_yLabelSum==defaultYSum) {
         _yLabelSum = yLabelsDifTotal % 2 == 0 ? yLabelsDifTotal : yLabelsDifTotal + 1;
     }
@@ -85,7 +85,7 @@
     
     if (_yChartLabels) {
         [self viewCleanupForCollection:_yChartLabels];
-    }else{
+    } else {
         _yLabels = [NSMutableArray new];
     }
     
@@ -93,52 +93,59 @@
         //Add y labels
       float yLabelSectionHeight = (self.frame.size.height - _chartMargin * 2 - kXLabelHeight) / _yLabelSum;
       
-      // !!!: 用户自行修改Y轴坐标值
-      if (_yLabels) {
-        
-        [self getYValueMax:_yLabels];
-        
-        for (int i=0; i<_yLabels.count; i++) {
-          float yAsixValues=[[_yLabels objectAtIndex:_yLabels.count-i-1] floatValue];
-          NSString *labelText= _yLabelFormatter(yAsixValues);
-          
-          
-          
-          PNChartLabel * label = [[PNChartLabel alloc] initWithFrame:CGRectMake(0,
-                                                                                yLabelSectionHeight * i + _chartMargin - kYLabelHeight/2.0,
-                                                                                _yChartLabelWidth,
-                                                                                kYLabelHeight)];
-          label.font = _labelFont;
-          label.textColor = _labelTextColor;
-          [label setTextAlignment:NSTextAlignmentRight];
-          label.text = labelText;
-          
-          [_yChartLabels addObject:label];
-          [self addSubview:label];
-          
-        }
-        
-      }else{
+      [self __addYCoordinateLabelsValuesWithyLabelSectionHeight:yLabelSectionHeight];
+     
+    }
+}
 
-               for (int index = 0; index < _yLabelSum; index++) {
-            
-            NSString *labelText = _yLabelFormatter((float)_yValueMax * ( (_yLabelSum - index) / (float)_yLabelSum ));
-            
-            PNChartLabel * label = [[PNChartLabel alloc] initWithFrame:CGRectMake(0,
-                                                                                  yLabelSectionHeight * index + _chartMargin - kYLabelHeight/2.0,
-                                                                                  _yChartLabelWidth,
-                                                                                  kYLabelHeight)];
-            label.font = _labelFont;
-            label.textColor = _labelTextColor;
-            [label setTextAlignment:NSTextAlignmentRight];
-            label.text = labelText;
-            
-            [_yChartLabels addObject:label];
-            [self addSubview:label];
-            
-        }
-      }
+#pragma mark - Private Method
+#pragma mark - 添加柱状图的Y轴坐标
+- (void)__addYCoordinateLabelsValuesWithyLabelSectionHeight:(float)yLabelSectionHeight{
+  
+  if (_yLabels) {
+    
+    [self getYValueMax:_yLabels];
+    
+    for (int i=0; i<_yLabels.count; i++) {
+      float yAsixValues=[[_yLabels objectAtIndex:_yLabels.count-i-1] floatValue];
+      NSString *labelText= _yLabelFormatter(yAsixValues);
+      
+      
+      
+      PNChartLabel * label = [[PNChartLabel alloc] initWithFrame:CGRectMake(0,
+                                                                            yLabelSectionHeight * i + _chartMargin - kYLabelHeight/2.0,
+                                                                            _yChartLabelWidth,
+                                                                            kYLabelHeight)];
+      label.font = _labelFont;
+      label.textColor = _labelTextColor;
+      [label setTextAlignment:NSTextAlignmentRight];
+      label.text = labelText;
+      
+      [_yChartLabels addObject:label];
+      [self addSubview:label];
+      
+    }
+    
+  }else{
+    
+    for (int index = 0; index < _yLabelSum; index++) {
+      
+      NSString *labelText = _yLabelFormatter((float)_yValueMax * ( (_yLabelSum - index) / (float)_yLabelSum ));
+      
+      PNChartLabel * label = [[PNChartLabel alloc] initWithFrame:CGRectMake(0,
+                                                                            yLabelSectionHeight * index + _chartMargin - kYLabelHeight/2.0,
+                                                                            _yChartLabelWidth,
+                                                                            kYLabelHeight)];
+      label.font = _labelFont;
+      label.textColor = _labelTextColor;
+      [label setTextAlignment:NSTextAlignmentRight];
+      label.text = labelText;
+      
+      [_yChartLabels addObject:label];
+      [self addSubview:label];
+      
     }
+  }
 }
 
 -(void)updateChartData:(NSArray *)data{