如果比例較小的時候，還不容易看出來折現(xiàn)標注的點不準確勺择，但是比例小的時候创南，如y軸為0-5伦忠，就可以看出來省核，x,y都不準確。

修改一個方法的兩個地方

- (void)calculateChartPath:(NSMutableArray *)chartPath andPointsPath:(NSMutableArray *)pointsPath andPathKeyPoints:(NSMutableArray *)pathPoints andPathStartEndPoints:(NSMutableArray *)pointsOfPath {

            //  添加 _yValueMax = self.yFixedValueMax;
        _yValueMax = self.yFixedValueMax;
        
        // Draw each line
        for (NSUInteger lineIndex = 0; lineIndex < self.chartData.count; lineIndex++) {
            PNLineChartData *chartData = self.chartData[lineIndex];

            CGFloat yValue;
            CGFloat innerGrade;

            UIBezierPath *progressline = [UIBezierPath bezierPath];

            UIBezierPath *pointPath = [UIBezierPath bezierPath];

            [chartPath insertObject:progressline atIndex:lineIndex];
            [pointsPath insertObject:pointPath atIndex:lineIndex];

            NSMutableArray *gradePathArray = [NSMutableArray array];
            [self.gradeStringPaths addObject:gradePathArray];

            NSMutableArray *linePointsArray = [[NSMutableArray alloc] init];
            NSMutableArray *lineStartEndPointsArray = [[NSMutableArray alloc] init];
            int last_x = 0;
            int last_y = 0;
            NSMutableArray<NSDictionary<NSString *, NSValue *> *> *progrssLinePaths = [NSMutableArray new];
            CGFloat inflexionWidth = chartData.inflexionPointWidth;

            for (NSUInteger i = 0; i < chartData.itemCount; i++) {

                yValue = chartData.getData(i).y;

                if (!(_yValueMax - _yValueMin)) {
                    innerGrade = 0.5;
                } else {
                    innerGrade = (yValue - _yValueMin) / (_yValueMax - _yValueMin);
                }
        
                        // 加上對yAxisOffset偏移
                CGFloat yAxisOffset = 10.f;
                
                int x = i * _xLabelWidth + _chartMarginLeft + _xLabelWidth / 2.0 + yAxisOffset;

最近昆码，看了JBChartView气忠，這個從設(shè)計上可能更好，相較于PNChart更容易讀懂赋咽，也沒有出現(xiàn)點位置不對的情況旧噪，準備替換項目里的PNChart。JBChartView的設(shè)計借鑒了UITableView,將圖標分成一段一段的脓匿，可以像設(shè)置cell那樣設(shè)置每一段的情況淘钟，代碼寫起來和創(chuàng)建UITableView沒什么區(qū)別。