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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。
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