我在我的应用程序中使用了core-plot来显示堆叠条形图,我遵循了这个很好的教程来实现堆叠条形图,现在图看起来如下所示。"http://www.gilthonwe.com/2012/06/09/stacked-bar-chart-coreplot-ios/“
我使用下面的代码显示条形图值,同时用户在屏幕上触摸它们。
-(void)barPlot:(CPTBarPlot *)plot barWasSelectedAtRecordIndex:(NSUInteger)index
{
if (plot.isHidden == YES) {
return;
}
static CPTMutableTextStyle *style = nil;
if (!style) {
style = [CPTMutableTextStyle textStyle];
style.color= [CPTColor yellowColor];
style.fontSize = 16.0f;
style.fontName = @"Helvetica-Bold";
}
NSNumber *price = [NSNumber numberWithDouble:[self doubleForPlot:plot field:CPTBarPlotFieldBarTip recordIndex:index]];
if (!self.priceAnnotation) {
NSNumber *x = [NSNumber numberWithInt:0];
NSNumber *y = [NSNumber numberWithInt:0];
NSArray *anchorPoint = [NSArray arrayWithObjects:x, y, nil];
self.priceAnnotation = [[CPTPlotSpaceAnnotation alloc] initWithPlotSpace:plot.plotSpace anchorPlotPoint:anchorPoint];
}
static NSNumberFormatter *formatter = nil;
if (!formatter) {
formatter = [[NSNumberFormatter alloc] init];
[formatter setMaximumFractionDigits:2];
}
// 5 - Create text layer for annotation
NSString *priceValue = [formatter stringFromNumber:price];
CPTTextLayer *textLayer = [[CPTTextLayer alloc] initWithText:priceValue style:style];
self.priceAnnotation.contentLayer = textLayer;
NSLog(@"barWasSelectedAtRecordIndex %lu", (unsigned long)index);
NSInteger plotIndex = 0;
if ([plot.identifier isEqual:[sets objectForKey:@"Due"]] == YES) {
plotIndex = 0;
} else if ([plot.identifier isEqual:[sets objectForKey:@"Overdue"]] == YES) {
plotIndex = 1;
} else if ([plot.identifier isEqual:[sets objectForKey:@"Paid"]] == YES) {
plotIndex = 2;
}
CGFloat x =10.00;
NSNumber *anchorX = [NSNumber numberWithFloat:x];
CGFloat y = 10.00;
NSNumber *anchorY = [NSNumber numberWithFloat:y];
self.priceAnnotation.anchorPlotPoint = [NSArray arrayWithObjects:anchorX, anchorY, nil];
// 8 - Add the annotation
[plot.graph.plotAreaFrame.plotArea addAnnotation:self.priceAnnotation];
}有关上述代码的响应,请参见图

在这里我要面对几个问题
1.这些值不显示在所选条形图上方的确切位置。
如果单击“蓝色条形图”,将显示该条的确切值。Display Value=8
如果我点击绿条,我将得到蓝条值和绿条值的累积和值。Display Value=14
如果我点击红色条形图,我将得到蓝色、绿色、红色条形图的累积和值。Display Value=21
当用户触摸屏幕上的条形图时,如何在选定的条形图上显示准确的条形图值?
发布于 2015-10-29 11:49:57
问题中的代码显示所选条形图的“提示”值。在这种情况下,那是酒吧的顶端。如果您想要选定段的长度,则减去条形图的“基”值。
https://stackoverflow.com/questions/33406743
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