效果图
效果图.gif
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。
作者:无夜之星辰
链接:https://www.jianshu.com/p/759ea22a2a0f