fix bug

@@ -39,8 +39,8 @@
 
 - (void)setGrade:(float)grade
 {
-//    NSLog(@"New garde %f",grade);
-  
+    NSLog(@"New garde %f",grade);
+    _grade = grade;
     CGFloat startPosY = (1 - grade) * self.frame.size.height;
 
     UIBezierPath *progressline = [UIBezierPath bezierPath];
@@ -180,7 +180,7 @@
         _textLayer = [[CATextLayer alloc]init];
         [_textLayer setString:@"0"];
         [_textLayer setAlignmentMode:kCAAlignmentCenter];
-        [_textLayer setForegroundColor:[[UIColor blackColor] CGColor]];
+        [_textLayer setForegroundColor:[[UIColor colorWithRed:178/255.0 green:178/255. blue:178/255.0 alpha:1.0] CGColor]];
     }
 
     return _textLayer;
@@ -188,23 +188,29 @@
 
 -(void)setGradeFrame:(CGFloat)grade startPosY:(CGFloat)startPosY
 {
-    CGFloat textheigt = self.bounds.size.width;
+    CGFloat textheigt = self.bounds.size.height*self.grade;
+  
+    CGFloat topSpace = self.bounds.size.height * (1-self.grade);
     CGFloat textWidth = self.bounds.size.width;
-    CGFloat textStartPosY;
-    
-    
-    if (startPosY < textheigt) {
-        textStartPosY = startPosY;
-    }
-    else {
-        textStartPosY = startPosY - textheigt;
-    }
-    
+  
     [_chartLine addSublayer:self.textLayer];
-    [self.textLayer setFontSize:textheigt/2];
+    [self.textLayer setFontSize:18.0];
   
     [self.textLayer setString:[[NSString alloc]initWithFormat:@"%0.f",grade*self.maxDivisor]];
-    [self.textLayer setFrame:CGRectMake(0, textStartPosY, textWidth,  textheigt)];
+  
+    CGSize size = CGSizeMake(320,2000); //设置一个行高上限
+    NSDictionary *attributes = @{NSFontAttributeName:[UIFont systemFontOfSize:18.0]};
+    size = [self.textLayer.string boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin attributes:attributes context:nil].size;
+    float verticalY ;
+  
+    if (size.height>=textheigt) {
+      
+      verticalY = topSpace - size.height;
+    } else {
+      verticalY = topSpace +  (textheigt-size.height)/2.0;
+    }
+  
+    [self.textLayer setFrame:CGRectMake((textWidth-size.width)/2.0,verticalY, size.width,size.height)];
     self.textLayer.contentsScale = [UIScreen mainScreen].scale;
 
 }
@@ -212,6 +218,15 @@
 - (void)setIsNegative:(BOOL)isNegative{
   if (isNegative) {
     [self.textLayer setString:[[NSString alloc]initWithFormat:@"-%0.f",_grade*self.maxDivisor]];
+    
+    CGSize size = CGSizeMake(320,2000); //设置一个行高上限
+    NSDictionary *attributes = @{NSFontAttributeName:[UIFont systemFontOfSize:18.0]};
+    size = [self.textLayer.string boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin attributes:attributes context:nil].size;
+    CGRect frame = self.textLayer.frame;
+    frame.origin.x = (self.bounds.size.width - size.width)/2.0;
+    frame.size = size;
+    self.textLayer.frame = frame;
+    
     CABasicAnimation* rotationAnimation;
     rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
     rotationAnimation.toValue = [NSNumber numberWithFloat: M_PI];

@@ -250,7 +250,7 @@
         if (isnan(grade)) {
             grade = 0;
         }
-      bar.maxDivisor = (float)_yValueMax;
+        bar.maxDivisor = (float)_yValueMax;
         bar.grade = grade;
         CGRect originalFrame = bar.frame;
        if (value<0 && self.showLevelLine) {

@@ -113,7 +113,7 @@
   
         [self.barChart setStrokeColors:@[PNGreen,PNGreen,PNRed,PNGreen]];
         // Adding gradient
-        self.barChart.barColorGradientStart = [UIColor blueColor];
+//        self.barChart.barColorGradientStart = [UIColor blueColor];
       
         [self.barChart strokeChart];