开始绘制
[self.lineView drawLineChart];

- (ZHLineChartView *)lineView
{
    if (!_lineView) {
        _lineView = [[ZHLineChartView alloc] initWithFrame:CGRectMake(0, 10, CGRectGetWidth(self.view.frame), 200)];
        _lineView.max = @600;
        _lineView.min = @300;
        _lineView.horizontalDataArr = @[@"2020-02", @"2020-03", @"2020-04", @"2020-05", @"2020-06", @"2020-07"];
        _lineView.lineDataAry = @[@502, @523, @482, @455, @473, @546];
        _lineView.splitCount = 3;
        _lineView.toCenter = NO;
        _lineView.edge = UIEdgeInsetsMake(25, 15, 50, 25);
        _lineView.backgroundColor = [UIColor whiteColor];
        [self.scrollView addSubview:_lineView];
    }
    return _lineView;
}