切换Controller中的不同UIView且不会覆盖前面一个UI

第一次进来的时候：
      1⃣️  m_imageViewGraphs = [[UIImageView alloc]initWithImage:[self minuteLinesView]];
        [self.view addSubview:m_imageViewGraphs];

      2⃣️   m_axisUnit=[[AxisUnitPriceView alloc]initWithFrame:CGRectMake(2, 390, 20, 250) :m_difference :m_beginPrice];

      3⃣️m_showBar=[[ShowBar alloc]initWithFrame:CGRectMake(15, 28, 70, 2)];
        [self addSubview:m_showBar];


之后的切换：
      1⃣️  m_imageViewGraphs.image = [self minuteLinesView];
      2⃣️    m_axisUnit.firstLabel.text = [NSString stringWithFormat:@"%.2f",m_difference+m_beginPrice];
      3⃣️m_showBar.frame=CGRectMake(15+barPoint.x/3+3, 28, 70, 2);