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如何启用 Core Plot 饼图中的某个部分的触摸选择？

发布于 2024-10-08 17:55:27 字数 221 浏览 0 评论 0原文

我正在使用 Core Plot 框架来绘制饼图，并且在绘制饼图本身时没有任何问题。

但是，我需要饼图本质上是交互式的，即，如果我点击饼图中的任何特定部分，它应该触发导航到显示该特定部分的详细信息的页面。

我尝试使用方法 -(void)pieChart:sliceWasSelectedAtRecordIndex:，但该委托方法从未被调用。我需要什么才能启用这种触摸交互？

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胡大本事 2024-10-15 17:55:30

使用最后一个corePlot框架（1.4）我找不到CPPieChart，但我用CPTPieChartDelegate修复：

@interface CPDFirstViewController : UIViewController <CPTPlotDataSource, CPTPieChartDelegate, ...>

和这个方法：

-(void)pieChart:(CPTPieChart *)pieChart sliceWasSelectedAtRecordIndex:(NSUInteger)index
{
  // Put your action here
}

CPPieChartDelegate使用 CorePlot 1.4，code> 不再被识别为来自 Xcode 的委托

希望它有帮助。

多姆

Using the last corePlot framework (1.4) i could not find CPPieChart but I fixed with CPTPieChartDelegate:

@interface CPDFirstViewController : UIViewController <CPTPlotDataSource, CPTPieChartDelegate, ...>

and this method:

-(void)pieChart:(CPTPieChart *)pieChart sliceWasSelectedAtRecordIndex:(NSUInteger)index
{
  // Put your action here
}

CPPieChartDelegate is not recognized any more as Delegate from Xcode, using CorePlot 1.4

Hope it helps.

dom

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獨角戲 2024-10-15 17:55:29

我已经使用 CorePlot 0.2.2 在我的 iPad 应用程序中实现了饼图选择。你的猜测使用
(void)pieChart:sliceWasSelectedAtRecordIndex: 是正确的，但也许你已经忘记了
声明以下两件事：

您的控制器是否声明了CPPieChartDelegate协议？
您是否告诉饼图您的控制器是其委托？

我的视图控制器在标头声明中如下所示：

@interface YourViewController : UIViewController < CPPieChartDataSource,
                                                   CPPieChartDelegate,
                                                   ... >
{
   ...
   CPXYGraph*          pieGraph;
   CPGraphHostingView* pieView;
}

@property (nonatomic, retain) IBOutlet CPGraphHostingView* pieView;

- (void)pieChart:(CPPieChart *)plot sliceWasSelectedAtRecordIndex:(NSUInteger)index;

@end

在 (void)viewDidLoad 期间调用饼图的创建，其中我设置了数据源和饼图的委托：

-(void)viewDidLoad {
   [self createPie];
}

-(void)createPie {
   pieGraph = [[CPXYGraph alloc] initWithFrame:CGRectZero];
   pieGraph.axisSet = nil;
   self.pieView.hostedGraph = pieGraph;

   CPPieChart *pieChart = [[CPPieChart alloc] init];

   // This is important in order to have your slice selection handler called!
   pieChart.delegate = self;

   pieChart.dataSource = self;

   pieChart.pieRadius = 80.0;
   [pieGraph addPlot:pieChart];
   [pieChart release];
}

- (void)pieChart:(CPPieChart *)plot sliceWasSelectedAtRecordIndex:(NSUInteger)index {
   // Do whatever you need when the pie slice has been selected.
}

I have implemented pie piece selection in my iPad app with CorePlot 0.2.2. Your guess to use
(void)pieChart:sliceWasSelectedAtRecordIndex: is correct, but maybe you have forgotten
to declare the following two things:

Does your controller declares the CPPieChartDelegate protocol?
Did you tell the pie chart that your controller is its delegate?

My view controller looks like this in the header declaration:

@interface YourViewController : UIViewController < CPPieChartDataSource,
                                                   CPPieChartDelegate,
                                                   ... >
{
   ...
   CPXYGraph*          pieGraph;
   CPGraphHostingView* pieView;
}

@property (nonatomic, retain) IBOutlet CPGraphHostingView* pieView;

- (void)pieChart:(CPPieChart *)plot sliceWasSelectedAtRecordIndex:(NSUInteger)index;

@end

The creation of the pie chart is called during the (void)viewDidLoad, where I set the data source and the delegate of the pie chart:

-(void)viewDidLoad {
   [self createPie];
}

-(void)createPie {
   pieGraph = [[CPXYGraph alloc] initWithFrame:CGRectZero];
   pieGraph.axisSet = nil;
   self.pieView.hostedGraph = pieGraph;

   CPPieChart *pieChart = [[CPPieChart alloc] init];

   // This is important in order to have your slice selection handler called!
   pieChart.delegate = self;

   pieChart.dataSource = self;

   pieChart.pieRadius = 80.0;
   [pieGraph addPlot:pieChart];
   [pieChart release];
}

- (void)pieChart:(CPPieChart *)plot sliceWasSelectedAtRecordIndex:(NSUInteger)index {
   // Do whatever you need when the pie slice has been selected.
}

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