iOS中PNChart与UITableView的联动示例详解

2020-07-26 02:25:48

字体：大中小

来源：转载

供稿：网友

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：