Kevin

Merge pull request #61 from cleexiang/master

NSString -> NSNumber
@@ -165,7 +165,7 @@ @@ -165,7 +165,7 @@
165 CGFloat chartCavanHeight = self.frame.size.height - _chartMargin * 2 - xLabelHeight; 165 CGFloat chartCavanHeight = self.frame.size.height - _chartMargin * 2 - xLabelHeight;
166 NSInteger index = 0; 166 NSInteger index = 0;
167 167
168 - for (NSString *valueString in _yValues) { 168 + for (NSNumber *valueString in _yValues) {
169 float value = [valueString floatValue]; 169 float value = [valueString floatValue];
170 170
171 float grade = (float)value / (float)_yValueMax; 171 float grade = (float)value / (float)_yValueMax;