iOS中PNChart與UITableView的聯動示例詳解

2020-07-26 02:25:48

字體：大中小

來源：轉載

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前言

在開發中，特別是銷售企業內部使用的APP，可能會用到數據匯總，使用到圖表的功能！本文主要給大家介紹了關于iOS中PNChart與UITableView聯動的相關內容，分享出來供大家參考學習，下面話不多說了，來一起看看詳細的介紹吧

效果圖

1.點擊chart，tableView對應模塊高亮

PNChart提供了一個代理方法，用來處理用戶的點擊事件：

#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.點擊cell，chart對應模塊高亮

PNChart并未提供相應方法讓某一模塊高亮，怎么辦？

思路：

雖然PNChart未直接提供讓某一模塊高亮的方法，但是我們可以從用戶點擊模塊高亮那部分代碼入手，看看用戶點擊到模塊高亮是怎樣一個過程。

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]; }}

發現它調用了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]; } }}

通過源代碼我們可以發現，用戶點擊chart的時候，將傳入的參數touchLocation轉換成了index，這個index正是代理方法userClickedOnPieIndexItem:所需要的參數。另外，chart的某一模塊高亮，實際上是addSublayer:，而這個sublayer的屬性也是由index決定的。所以，通過主動調用一個方法讓chart的某個模塊高亮，關鍵就是這個index。

這樣的話，就很簡單了。只需把didTouchAt :的后半段代碼提出來，就是我們需要的新方法了：

/** 某一模塊高亮 @param index 高亮模塊的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]; } }}

現在就可以實現點擊cell，chart對應模塊高亮了：

- (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]; // 對應的模塊高亮 [self.pieChart highlightItemWithIndex:indexPath.row];}

修改源碼注意事項

如果你的PNChart是手動拖進去的，修改源碼無所謂；

但如果是用CocoaPods管理的話，就要注意一下了：pod update的時候會覆蓋你寫的代碼。為避免這種事情發生，你可以指定庫的版本，如：