前言

在开发中,特别是销售企业内部使用的APP,可能会用到数据汇总,使用到图表的功能!本文主要给大家介绍了关于iOS中PNChart与UITableView联动的相关内容,分享出来供大家参考学习,下面话不多说了,来一起看看详细的介绍吧

效果图


1.点击chart,tableView对应模块高亮

PNChart提供了一个代理方法,用来处理用户的点击事件:

#pragma mark - PNChart Delegate

- (void)userClickedOnPieIndexItem:(NSInteger)pieIndex {
 for (int i = 0; i < self.model.department_sale.count; i++) {
 CQSaleDetailDepartmentItemModel *model = self.model.department_sale[i];
 model.selected = (i == pieIndex);
 }
 [self.tableView reloadData];
 [self.tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:pieIndex inSection:0] atScrollPosition:UITableViewScrollPositionMiddle animated:YES];
}

2.点击cell,chart对应模块高亮

PNChart并未提供相应方法让某一模块高亮,怎么办?

思路:

虽然PNChart未直接提供让某一模块高亮的方法,但是我们可以从用户点击模块高亮那部分代码入手,看看用户点击到模块高亮是怎样一个过程。

1.在PNPieChart.m里面找到touchesBegan方法:

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
 for (UITouch *touch in touches) {
 CGPoint touchLocation = [touch locationInView:_contentView];
 [self didTouchAt:touchLocation];
 }
}

发现它调用了didTouchAt:方法。

2.分析didTouchAt:

- (void)didTouchAt:(CGPoint)touchLocation
{
 CGPoint circleCenter = CGPointMake(_contentView.bounds.size.width/2, _contentView.bounds.size.height/2);
 
 CGFloat distanceFromCenter = sqrtf(powf((touchLocation.y - circleCenter.y),2) + powf((touchLocation.x - circleCenter.x),2));
 
 if (distanceFromCenter < _innerCircleRadius) {
 if ([self.delegate respondsToSelector:@selector(didUnselectPieItem)]) {
  [self.delegate didUnselectPieItem];
 }
 [self.sectorHighlight removeFromSuperlayer];
 return;
 }
 
 CGFloat percentage = [self findPercentageOfAngleInCircle:circleCenter fromPoint:touchLocation];
 int index = 0;
 while (percentage > [self endPercentageForItemAtIndex:index]) {
 index ++;
 }
 
 if ([self.delegate respondsToSelector:@selector(userClickedOnPieIndexItem:)]) {
 [self.delegate userClickedOnPieIndexItem:index];
 }
 
 if (self.shouldHighlightSectorOnTouch)
 {
 if (!self.enableMultipleSelection)
 {
  if (self.sectorHighlight)
  [self.sectorHighlight removeFromSuperlayer];
 }
 
 PNPieChartDataItem *currentItem = [self dataItemForIndex:index];
 
 CGFloat red,green,blue,alpha;
 UIColor *old = currentItem.color;
 [old getRed:&red green:&green blue:&blue alpha:&alpha];
 alpha /= 2;
 UIColor *newColor = [UIColor colorWithRed:red green:green blue:blue alpha:alpha];
 
 CGFloat startPercentage = [self startPercentageForItemAtIndex:index];
 CGFloat endPercentage = [self endPercentageForItemAtIndex:index];
 
 self.sectorHighlight = [self newCircleLayerWithRadius:_outerCircleRadius + 5
       borderWidth:10
       fillColor:[UIColor clearColor]
       borderColor:newColor
      startPercentage:startPercentage
      endPercentage:endPercentage];
 
 if (self.enableMultipleSelection)
 {
  NSString *dictIndex = [NSString stringWithFormat:@"%d", index];
  CAShapeLayer *indexShape = [self.selectedItems valueForKey:dictIndex];
  if (indexShape)
  {
  [indexShape removeFromSuperlayer];
  [self.selectedItems removeObjectForKey:dictIndex];
  }
  else
  {
  [self.selectedItems setObject:self.sectorHighlight forKey:dictIndex];
  [_contentView.layer addSublayer:self.sectorHighlight];
  }
 }
 else
 {
  [_contentView.layer addSublayer:self.sectorHighlight];
 }
 }
}

通过源代码我们可以发现,用户点击chart的时候,将传入的参数touchLocation转换成了index,这个index正是代理方法userClickedOnPieIndexItem:所需要的参数。另外,chart的某一模块高亮,实际上是addSublayer:,而这个sublayer的属性也是由index决定的。所以,通过主动调用一个方法让chart的某个模块高亮,关键就是这个index。

这样的话,就很简单了。只需把didTouchAt :的后半段代码提出来,就是我们需要的新方法了:

/**
 某一模块高亮

 @param index 高亮模块的index
 */
- (void)highlightItemWithIndex:(NSInteger)index {
 if (self.shouldHighlightSectorOnTouch)
 {
 if (!self.enableMultipleSelection)
 {
  if (self.sectorHighlight)
  [self.sectorHighlight removeFromSuperlayer];
 }
 
 PNPieChartDataItem *currentItem = [self dataItemForIndex:index];
 
 CGFloat red,green,blue,alpha;
 UIColor *old = currentItem.color;
 [old getRed:&red green:&green blue:&blue alpha:&alpha];
 alpha /= 2;
 UIColor *newColor = [UIColor colorWithRed:red green:green blue:blue alpha:alpha];
 
 CGFloat startPercentage = [self startPercentageForItemAtIndex:index];
 CGFloat endPercentage = [self endPercentageForItemAtIndex:index];
 
 self.sectorHighlight = [self newCircleLayerWithRadius:_outerCircleRadius + 5
       borderWidth:10
       fillColor:[UIColor clearColor]
       borderColor:newColor
      startPercentage:startPercentage
      endPercentage:endPercentage];
 
 if (self.enableMultipleSelection)
 {
  NSString *dictIndex = [NSString stringWithFormat:@"%ld", (long)index];
  CAShapeLayer *indexShape = [self.selectedItems valueForKey:dictIndex];
  if (indexShape)
  {
  [indexShape removeFromSuperlayer];
  [self.selectedItems removeObjectForKey:dictIndex];
  }
  else
  {
  [self.selectedItems setObject:self.sectorHighlight forKey:dictIndex];
  [_contentView.layer addSublayer:self.sectorHighlight];
  }
 }
 else
 {
  [_contentView.layer addSublayer:self.sectorHighlight];
 }
 }
}

现在就可以实现点击cell,chart对应模块高亮了:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
 for (int i = 0; i < self.model.department_sale.count; i++) {
 CQSaleDetailDepartmentItemModel *model = self.model.department_sale[i];
 model.selected = (i == indexPath.row);
 }
 [self.tableView reloadData];
 [self.tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:indexPath.row inSection:0] atScrollPosition:UITableViewScrollPositionMiddle animated:YES];
 // 对应的模块高亮
 [self.pieChart highlightItemWithIndex:indexPath.row];
}

修改源码注意事项

如果你的PNChart是手动拖进去的,修改源码无所谓;

但如果是用CocoaPods管理的话,就要注意一下了:pod update的时候会覆盖你写的代码。为避免这种事情发生,你可以指定库的版本,如:

pod 'PNChart','0.8.9'

pod update的时候,若发现其版本是指定的版本,就不会更新了。

总结

以上就是这篇文章的全部内容了,希望本文的内容对大家的学习或者工作具有一定的参考学习价值,如果有疑问大家可以留言交流,谢谢大家对悠悠之家的支持。

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