首页 > 代码库 > CorePlot学习六---点击scatterPlot中的symbol点时弹出对应的凝视
CorePlot学习六---点击scatterPlot中的symbol点时弹出对应的凝视
因为项目须要用到用户点击 symbol时,弹出对应的具体信息,发现国内解说的比較少,经过一番搜索验证最终解决,先看效果图:
详细须要改动的代码例如以下:
首先要引用托付方法:CPTScatterPlotDelegate、CPTPlotSpaceDelegate
完毕例如以下:
#pragma mark - #pragma mark CPTPlotSpaceDelegate methods -(BOOL)plotSpace:(CPTPlotSpace *)space shouldHandlePointingDeviceCancelledEvent:(UIEvent *)event { return YES; } -(BOOL)plotSpace:(CPTPlotSpace *)space shouldHandlePointingDeviceUpEvent:(UIEvent *)event atPoint:(CGPoint)point { return YES; } -(BOOL)plotSpace:(CPTPlotSpace *)space shouldHandlePointingDeviceDownEvent:(UIEvent *)event atPoint:(CGPoint)point { NSLog(@"you putdown at point:%@",[NSValue valueWithCGPoint:point] ); return YES; } -(BOOL)plotSpace:(CPTPlotSpace *)space shouldHandlePointingDeviceDraggedEvent:(UIEvent *)event atPoint:(CGPoint)point { return YES; } #pragma mark - #pragma mark CPTScatterPlotDelegate //当我们选择对应的点时。弹出凝视: <span style="color:#FF0000;">-(void)scatterPlot:(CPTScatterPlot *)plot plotSymbolWasSelectedAtRecordIndex:(NSUInteger)idx withEvent:(UIEvent *)event { </span> if ( symbolTextAnnotation ) { [xyGraph.plotAreaFrame.plotArea removeAnnotation:symbolTextAnnotation]; symbolTextAnnotation = nil; } // Setup a style for the annotation CPTMutableTextStyle *hitAnnotationTextStyle = [CPTMutableTextStyle textStyle]; hitAnnotationTextStyle.color = [CPTColor greenColor]; hitAnnotationTextStyle.fontSize = 10.0f; hitAnnotationTextStyle.fontName = @"Helvetica-Bold"; // Determine point of symbol in plot coordinates NSNumber *x = [[datasForPlot objectAtIndex:idx] valueForKey:@"x"]; NSNumber *y = [[datasForPlot objectAtIndex:idx] valueForKey:@"y"]; NSString *date = [[datasForPlot objectAtIndex:idx]valueForKey:@"date"]; NSArray *anchorPoint = [NSArray arrayWithObjects:x, y, nil]; // Add annotation // First make a string for the y value NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init]; [formatter setMaximumFractionDigits:2]; NSString *yString = [formatter stringFromNumber:y]; NSString *myString = [NSString stringWithFormat:@"温度:%@\n日期:%@\n事件:%@",yString,date,nil]; // Now add the annotation to the plot area CPTTextLayer *textLayer = [[CPTTextLayer alloc] initWithText:myString/*yString*/ style:hitAnnotationTextStyle]; symbolTextAnnotation = [[CPTPlotSpaceAnnotation alloc] initWithPlotSpace:xyGraph.defaultPlotSpace anchorPlotPoint:anchorPoint]; symbolTextAnnotation.contentLayer = textLayer; symbolTextAnnotation.displacement = CGPointMake(0.0, 20.0); [xyGraph.plotAreaFrame.plotArea addAnnotation:symbolTextAnnotation]; // NSLog(@"index:%lu,event:%@",(unsigned long)idx,event); }千万别忘记了依据自定义的设置对应的delegate = self;
红色标注的就是我们实现该功能的重点
对了。忘记说一点,该点很重要。不然你手指点击不灵活。我们的symbol那么小。还要点击到它的中心才干触发以下的方法,这多难啊,有个參数设置一下就搞定了,设置它的触发范围:
CPTScatterPlot *boundLinePlot = [[CPTScatterPlot alloc]init]; boundLinePlot.<span style="color:#FF0000;">plotSymbolMarginForHitDetection</span> = 5.0f;//设置symbol点的外沿范围。以用来检測手指的触摸ok搞定
其它的看凝视。不想再多加说明了
代码传送门:http://download.csdn.net/detail/u012951123/7521733
CorePlot学习六---点击scatterPlot中的symbol点时弹出对应的凝视
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