iOS中PNChart与UITableView的联动示例详解
- (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];
}
}
}