错误：“-[UIView setHostedGraph:]：无法识别的选择器”在 iPhone 应用程序中执行核心情节时

发布于 2024-10-18 12:14:02 字数 439 浏览 1 评论 0原文

当我尝试编译以下代码时出现以下错误：

由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：“-[UIView setHostedGraph:]：无法识别的选择器发送到实例 0x6768c10”

代码：

 UIView *ChartView;

  ChartView = [[UIView alloc] init];
  graph = [[CPXYGraph alloc] initWithFrame: ChartView.bounds];

CPGraphHostingView *hostingView = (CPGraphHostingView *)ChartView;
hostingView.hostedGraph = graph;

可能出了什么问题？

原文

I get the below error when I try to compile the below code:

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIView setHostedGraph:]: unrecognized selector sent to instance 0x6768c10'

Code:

 UIView *ChartView;

  ChartView = [[UIView alloc] init];
  graph = [[CPXYGraph alloc] initWithFrame: ChartView.bounds];

CPGraphHostingView *hostingView = (CPGraphHostingView *)ChartView;
hostingView.hostedGraph = graph;

What could be wrong?

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简美 2024-10-25 12:14:02

您正在将 UIView 实例（它不响应 -setHostedGraph:）转换为 CPGraphHostingView。 - 这将不起作用。

您需要创建一个实际的 CPGraphHostingView 对象，然后在其上调用 -setHostedGraph:。

所以，你的代码应该是这样的：

CGRect someFrame = ...;
CPGraphHostingView *hostingView = [[CPGraphHostingView alloc] initWithFrame:someFrame];
graph = [[CPXYGraph alloc] initWithFrame: hostingView.bounds];

hostingView.hostedGraph = graph;

You're casting a UIView instance (which does not respond to -setHostedGraph:) to a CPGraphHostingView. - This will not work.

You'll need to create an actual CPGraphHostingView object, then invoke -setHostedGraph: on it.

So, your code should look like this:

CGRect someFrame = ...;
CPGraphHostingView *hostingView = [[CPGraphHostingView alloc] initWithFrame:someFrame];
graph = [[CPXYGraph alloc] initWithFrame: hostingView.bounds];

hostingView.hostedGraph = graph;

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